| UNITED STATES | ||
| SECURITIES AND EXCHANGE COMMISSION | ||
Washington, D.C. 20549 | ||
| ☑ | QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 | ||||
| ☐ | TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 | ||||

| Pennsylvania | 23-1210010 | ||||||||||||||||||||||
| (State or other jurisdiction of incorporation or organization) | (I.R.S. Employer Identification Number) | ||||||||||||||||||||||
530 Herman O. West Drive, Exton, PA | 19341-1147 | ||||||||||||||||||||||
| (Address of principal executive offices) | (Zip Code) | ||||||||||||||||||||||
| Title of each class | Trading Symbol | Name of each exchange on which registered | ||||||
| Common Stock, par value $0.25 per share | WST | New York Stock Exchange | ||||||
| Large accelerated filer | ☑ | Accelerated filer | ☐ | |||||||||||
| Non-accelerated filer | ☐ | Smaller reporting company | ☐ | |||||||||||
| Emerging growth company | ☐ | |||||||||||||
| Page | ||||||||
| ITEM 1. | ||||||||
| ITEM 2. | ||||||||
| ITEM 3. | ||||||||
| ITEM 4. | ||||||||
| ITEM 1. | ||||||||
| ITEM 1A. | ||||||||
| ITEM 2. | ||||||||
| ITEM 5. | ||||||||
| ITEM 6. | ||||||||
| Three Months Ended June 30, | Six Months Ended June 30, | ||||||||||||||||||||||
| 2026 | 2025 | 2026 | 2025 | ||||||||||||||||||||
| Net sales | $ | 872.3 | $ | 766.5 | $ | 1,717.2 | $ | 1,464.5 | |||||||||||||||
| Cost of goods and services sold | 543.1 | 492.6 | 1,091.6 | 958.7 | |||||||||||||||||||
| Gross profit | 329.2 | 273.9 | 625.6 | 505.8 | |||||||||||||||||||
| Research and development | 19.7 | 19.1 | 35.5 | 35.4 | |||||||||||||||||||
| Selling, general and administrative expenses | 117.6 | 95.9 | 217.1 | 183.9 | |||||||||||||||||||
| Other expense (income) (Note 14) | 12.8 | 5.2 | 16.8 | 25.8 | |||||||||||||||||||
| Operating profit | 179.1 | 153.7 | 356.2 | 260.7 | |||||||||||||||||||
| Interest expense, net | 2.6 | 0.1 | 4.5 | 0.5 | |||||||||||||||||||
| Interest income | (3.8) | (3.6) | (8.9) | (7.7) | |||||||||||||||||||
| Other nonoperating expense (income) | 0.2 | 0.2 | 0.4 | 0.4 | |||||||||||||||||||
| Income before income taxes and equity in net income of affiliated companies | 180.1 | 157.0 | 360.2 | 267.5 | |||||||||||||||||||
| Income tax expense | 32.2 | 30.2 | 76.9 | 54.3 | |||||||||||||||||||
| Equity in net income of affiliated companies | (6.1) | (5.0) | (9.5) | (8.4) | |||||||||||||||||||
| Net income | $ | 154.0 | $ | 131.8 | $ | 292.8 | $ | 221.6 | |||||||||||||||
| Net income per share: | |||||||||||||||||||||||
| Basic | $ | 2.17 | $ | 1.82 | $ | 4.10 | $ | 3.06 | |||||||||||||||
| Diluted | $ | 2.15 | $ | 1.82 | $ | 4.07 | $ | 3.05 | |||||||||||||||
| Weighted average shares outstanding: | |||||||||||||||||||||||
| Basic | 70.8 | 72.2 | 71.4 | 72.3 | |||||||||||||||||||
| Diluted | 71.3 | 72.5 | 71.9 | 72.8 | |||||||||||||||||||
| Three Months Ended June 30, | Six Months Ended June 30, | ||||||||||||||||||||||
| 2026 | 2025 | 2026 | 2025 | ||||||||||||||||||||
| Net income | $ | 154.0 | $ | 131.8 | $ | 292.8 | $ | 221.6 | |||||||||||||||
| Other comprehensive (loss) income, net of tax: | |||||||||||||||||||||||
Foreign currency translation adjustments, net of tax of $0.4 and $(1.0), $0.5 and $(2.1), respectively | (14.1) | 114.9 | (33.6) | 165.3 | |||||||||||||||||||
Defined benefit pension and other postretirement plan adjustments, net of tax of $0.0 and $(0.2), $0.0 and $(0.3), respectively | (0.1) | (0.7) | (0.2) | (1.1) | |||||||||||||||||||
Net gain on equity affiliate accumulated other comprehensive income, net of tax of $0.0 and $0.0, $0.0 and $0.0, respectively | (0.1) | 0.1 | (0.1) | 0.2 | |||||||||||||||||||
Net (loss) gain on derivatives, net of tax of $(0.3) and $0.8, $(0.2) and $1.7, respectively | (0.9) | 2.5 | (1.0) | 5.0 | |||||||||||||||||||
| Other comprehensive (loss) income, net of tax | (15.2) | 116.8 | (34.9) | 169.4 | |||||||||||||||||||
| Comprehensive income | $ | 138.8 | $ | 248.6 | $ | 257.9 | $ | 391.0 | |||||||||||||||
| (in millions, except per share data) | June 30, 2026 | December 31, 2025 | |||||||||
| ASSETS | |||||||||||
| Current assets: | |||||||||||
| Cash and cash equivalents | $ | 435.8 | $ | 791.3 | |||||||
| Accounts receivable, net | 712.0 | 574.4 | |||||||||
| Inventories | 447.4 | 443.9 | |||||||||
| Other current assets | 212.3 | 168.6 | |||||||||
| Total current assets | 1,807.5 | 1,978.2 | |||||||||
| Property, plant and equipment | 3,248.6 | 3,223.4 | |||||||||
| Less: accumulated depreciation and amortization | 1,562.3 | 1,497.0 | |||||||||
| Property, plant and equipment, net | 1,686.3 | 1,726.4 | |||||||||
| Operating lease right-of-use assets | 104.7 | 117.0 | |||||||||
| Investments in affiliated companies | 207.7 | 212.3 | |||||||||
| Goodwill | 108.7 | 109.9 | |||||||||
| Intangible assets, net | 6.4 | 7.7 | |||||||||
| Deferred income taxes | 72.3 | 38.4 | |||||||||
| Other noncurrent assets | 82.8 | 80.1 | |||||||||
| Total Assets | $ | 4,076.4 | $ | 4,270.0 | |||||||
| LIABILITIES AND EQUITY | |||||||||||
| Current liabilities: | |||||||||||
| Accounts payable | $ | 252.7 | $ | 253.7 | |||||||
| Accrued salaries, wages and benefits | 97.1 | 135.9 | |||||||||
| Income taxes payable | 64.7 | 28.1 | |||||||||
| Operating lease liabilities | 20.9 | 22.7 | |||||||||
| Accrued commissions, rebates and royalties | 34.0 | 39.2 | |||||||||
| Other current liabilities | 171.1 | 175.3 | |||||||||
| Total current liabilities | 640.5 | 654.9 | |||||||||
| Long-term debt | 202.9 | 202.8 | |||||||||
| Deferred income taxes | 22.4 | 23.0 | |||||||||
| Pension and other postretirement benefits | 28.3 | 29.0 | |||||||||
| Operating lease liabilities | 88.3 | 95.6 | |||||||||
| Deferred compensation benefits | 13.9 | 13.5 | |||||||||
| Other long-term liabilities | 89.9 | 75.2 | |||||||||
| Total Liabilities | 1,086.2 | 1,094.0 | |||||||||
| Commitments and contingencies (Note 16) | |||||||||||
| Equity: | |||||||||||
Preferred stock, 3.0 million shares authorized; 0 shares issued and outstanding | — | — | |||||||||
Common stock, par value $0.25 per share; 200.0 million shares authorized; shares issued: June 30, 2026 - 75.3 million, December 31, 2025 - 75.3 million; shares outstanding: June 30, 2026 - 70.4 million, December 31, 2025 - 72.0 million | 18.8 | 18.8 | |||||||||
| Capital in excess of par value | — | — | |||||||||
| Retained earnings | 4,624.1 | 4,374.9 | |||||||||
| Accumulated other comprehensive loss | (140.4) | (105.5) | |||||||||
Treasury stock, at cost (June 30, 2026 - 4.9 million shares, December 31, 2025 - 3.3 million shares) | (1,512.3) | (1,112.2) | |||||||||
| Total Equity | 2,990.2 | 3,176.0 | |||||||||
| Total Liabilities and Equity | $ | 4,076.4 | $ | 4,270.0 | |||||||
| Six Months Ended June 30, | |||||||||||
| 2026 | 2025 | ||||||||||
| Cash flows from operating activities: | |||||||||||
| Net income | $ | 292.8 | $ | 221.6 | |||||||
| Adjustments to reconcile net income to net cash provided by operating activities: | |||||||||||
| Depreciation | 90.3 | 79.9 | |||||||||
| Amortization | 1.1 | 1.5 | |||||||||
| Stock-based compensation | 17.5 | 8.7 | |||||||||
| Non-cash restructuring charges | 1.9 | 1.6 | |||||||||
| Asset impairments | 4.2 | 4.1 | |||||||||
| Other non-cash items, net | (5.0) | (6.9) | |||||||||
Changes in assets and liabilities | (188.9) | (4.0) | |||||||||
| Net cash provided by operating activities | 213.9 | 306.5 | |||||||||
| Cash flows from investing activities: | |||||||||||
| Capital expenditures | (85.9) | (146.5) | |||||||||
| Net cash used in investing activities | (85.9) | (146.5) | |||||||||
| Cash flows from financing activities: | |||||||||||
| Borrowings under revolving credit agreements | 50.0 | — | |||||||||
| Repayments under revolving credit agreements | (50.0) | — | |||||||||
| Principal repayments on finance leases | (0.7) | (0.5) | |||||||||
| Excise tax payments | (0.8) | (4.2) | |||||||||
| Dividend payments | (31.5) | (30.3) | |||||||||
| Proceeds from stock-based compensation awards | 12.4 | 6.0 | |||||||||
| Employee stock purchase plan contributions | 3.9 | 3.6 | |||||||||
| Shares purchased under share repurchase programs | (454.3) | (134.0) | |||||||||
| Shares repurchased for employee tax withholdings | (2.5) | (2.5) | |||||||||
| Net cash used in financing activities | (473.5) | (161.9) | |||||||||
| Effect of exchange rates on cash | (10.0) | 27.0 | |||||||||
| Net (decrease) increase in cash and cash equivalents | (355.5) | 25.1 | |||||||||
| Cash, including cash equivalents at beginning of period | 791.3 | 484.6 | |||||||||
| Cash, including cash equivalents at end of period | $ | 435.8 | $ | 509.7 | |||||||
| Supplemental cash flow information: | |||||||||||
| Accrued capital expenditures | $ | 25.7 | $ | 35.4 | |||||||
| ($ in millions) | June 30, 2026 | December 31, 2025 | |||||||||
| Property, plant and equipment, net | $ | 42.1 | $ | 39.1 | |||||||
| Inventories | 24.2 | 20.5 | |||||||||
| Operating lease right-of-use assets | 1.2 | 1.2 | |||||||||
| Goodwill | 0.6 | 0.6 | |||||||||
| $ | 68.1 | $ | 61.4 | ||||||||
| Three Months Ended June 30, | Six Months Ended June 30, | ||||||||||||||||||||||
| 2026 | 2025 | 2026 | 2025 | ||||||||||||||||||||
| Biologics | 43 % | 38 % | 42 % | 38 % | |||||||||||||||||||
| Generics | 16 % | 17 % | 16 % | 17 % | |||||||||||||||||||
| Pharma | 24 % | 26 % | 24 % | 26 % | |||||||||||||||||||
| West Vantage | 17 % | 19 % | 18 % | 19 % | |||||||||||||||||||
100 % | 100 % | 100 % | 100 % | ||||||||||||||||||||
| Three Months Ended June 30, | Six Months Ended June 30, | ||||||||||||||||||||||
| 2026 | 2025 | 2026 | 2025 | ||||||||||||||||||||
| High-Value Product ("HVP") Components | 49 % | 47 % | 48 % | 46 % | |||||||||||||||||||
| High-Value Product ("HVP") Delivery Devices | 15 % | 13 % | 15 % | 13 % | |||||||||||||||||||
| Standard Packaging | 19 % | 21 % | 19 % | 22 % | |||||||||||||||||||
| West Vantage | 17 % | 19 % | 18 % | 19 % | |||||||||||||||||||
100 % | 100 % | 100 % | 100 % | ||||||||||||||||||||
| Three Months Ended June 30, | Six Months Ended June 30, | ||||||||||||||||||||||
| 2026 | 2025 | 2026 | 2025 | ||||||||||||||||||||
| Americas | 44 % | 45 % | 45 % | 47 % | |||||||||||||||||||
| Europe, Middle East, Africa | 46 % | 46 % | 46 % | 45 % | |||||||||||||||||||
| Asia Pacific | 10 % | 9 % | 9 % | 8 % | |||||||||||||||||||
100 % | 100 % | 100 % | 100 % | ||||||||||||||||||||
| ($ in millions) | |||||
Contract assets, December 31, 2025 | $ | 11.9 | |||
Contract assets, June 30, 2026 | 17.2 | ||||
| Change in contract assets - increase (decrease) | $ | 5.3 | |||
Deferred income, December 31, 2025 | $ | (53.7) | |||
Deferred income, June 30, 2026 | (45.7) | ||||
| Change in deferred income - decrease (increase) | $ | 8.0 | |||
| Three Months Ended June 30, | Six Months Ended June 30, | ||||||||||||||||||||||
| ($ in millions) | 2026 | 2025 | 2026 | 2025 | |||||||||||||||||||
| Net income | $ | 154.0 | $ | 131.8 | $ | 292.8 | $ | 221.6 | |||||||||||||||
| Weighted average common shares outstanding | 70.8 | 72.2 | 71.4 | 72.3 | |||||||||||||||||||
Dilutive effect of equity awards, based on the treasury stock method | 0.5 | 0.3 | 0.5 | 0.5 | |||||||||||||||||||
| Weighted average shares assuming dilution | 71.3 | 72.5 | 71.9 | 72.8 | |||||||||||||||||||
| Three Months Ended June 30, | Six Months Ended June 30, | ||||||||||||||||||||||
| 2026 | 2025 | 2026 | 2025 | ||||||||||||||||||||
| Shares repurchased | 538,591 | 2,312 | 1,760,610 | 552,593 | |||||||||||||||||||
| Total cost of repurchases ($ in millions) | $ | 156.7 | $ | 0.5 | $ | 454.3 | $ | 134.0 | |||||||||||||||
| Average price per repurchased share | $ | 290.82 | $ | 222.56 | $ | 258.03 | $ | 242.55 | |||||||||||||||
| ($ in millions) | June 30, 2026 | December 31, 2025 | |||||||||
| Raw materials | $ | 178.8 | $ | 163.2 | |||||||
| Work in process | 93.8 | 103.2 | |||||||||
| Finished goods | 174.8 | 177.5 | |||||||||
| $ | 447.4 | $ | 443.9 | ||||||||
| Three Months Ended June 30, | Six Months Ended June 30, | ||||||||||||||||||||||
| ($ in millions) | 2026 | 2025 | 2026 | 2025 | |||||||||||||||||||
| Operating lease cost | $ | 7.3 | $ | 6.8 | $ | 14.5 | $ | 13.4 | |||||||||||||||
| Finance lease - amortization of right-of-use (ROU) assets | 0.5 | 0.4 | 1.0 | 0.7 | |||||||||||||||||||
| Finance lease - interest on lease liabilities | — | 0.1 | 0.1 | 0.1 | |||||||||||||||||||
| Short-term lease cost | 1.1 | 0.7 | 2.0 | 1.5 | |||||||||||||||||||
| Variable lease cost | 3.0 | 2.5 | 5.5 | 5.4 | |||||||||||||||||||
| Total lease cost | $ | 11.9 | $ | 10.5 | $ | 23.1 | $ | 21.1 | |||||||||||||||
| June 30, | December 31, | ||||||||||||||||
| ($ in millions) | Balance Sheet Classification | 2026 | 2025 | ||||||||||||||
| ROU assets, net | $ | 33.2 | $ | 34.7 | |||||||||||||
| Lease liabilities (current) | $ | 1.4 | $ | 1.5 | |||||||||||||
| Lease liabilities (noncurrent) | $ | 3.0 | $ | 3.6 | |||||||||||||
| Six Months Ended June 30, | ||||||||||||||
| ($ in millions) | 2026 | 2025 | ||||||||||||
| Cash paid for amounts included in the measurement of lease liabilities: | ||||||||||||||
| Operating cash flows from operating leases | $ | 13.8 | $ | 12.6 | ||||||||||
| Operating cash flows from finance leases | $ | 0.1 | $ | 0.1 | ||||||||||
| Financing cash flows from finance leases | $ | 0.7 | $ | 0.5 | ||||||||||
| Right-of-use assets obtained in exchange for new lease liabilities: | ||||||||||||||
| Operating leases | $ | 0.8 | $ | 9.1 | ||||||||||
| Finance leases | $ | 0.2 | $ | 2.2 | ||||||||||
| June 30, 2026 | December 31, 2025 | ||||||||||
| Weighted average remaining lease term (in years): | |||||||||||
| Operating leases | 8.3 | 8.3 | |||||||||
| Finance leases | 4.1 | 4.4 | |||||||||
| Weighted average discount rate: | |||||||||||
| Operating leases | 4.72 | % | 4.67 | % | |||||||
| Finance leases | 4.09 | % | 4.15 | % | |||||||
| June 30, | December 31, | ||||||||||
| ($ in millions) | 2026 | 2025 | |||||||||
| Aggregate carrying value of investments in affiliated companies: | |||||||||||
| Equity method affiliates | $ | 207.1 | $ | 208.3 | |||||||
| Non-equity method affiliates | 0.6 | 4.0 | |||||||||
| Total investments in affiliated companies | $ | 207.7 | $ | 212.3 | |||||||
| June 30, | December 31, | ||||||||||
| ($ in millions) | 2026 | 2025 | |||||||||
| Payables due to affiliates | $ | 27.2 | $ | 26.2 | |||||||
| Receivables due from affiliates | $ | 2.7 | $ | 2.0 | |||||||
| Three Months Ended June 30, | Six Months Ended June 30, | ||||||||||||||||||||||
| ($ in millions) | 2026 | 2025 | 2026 | 2025 | |||||||||||||||||||
| Purchases from (and payments to) affiliates | $ | 34.3 | $ | 30.2 | $ | 68.3 | $ | 57.9 | |||||||||||||||
| Sales to affiliates | $ | 4.5 | $ | 2.8 | $ | 7.7 | $ | 6.0 | |||||||||||||||
| ($ in millions) | June 30, 2026 | December 31, 2025 | |||||||||
Term Loan, due July 2, 2027 (5.08%) | $ | 130.0 | $ | 130.0 | |||||||
Series C notes, due July 5, 2027 (4.02%) | 73.0 | 73.0 | |||||||||
| 203.0 | 203.0 | ||||||||||
| Less: unamortized debt issuance costs for Term Loan and Series Notes | 0.1 | 0.2 | |||||||||
| Total debt | 202.9 | 202.8 | |||||||||
| Less: current portion of long-term debt | — | — | |||||||||
| Long-term debt, net | $ | 202.9 | $ | 202.8 | |||||||
| (in millions) | June 30, | December 31, | |||||||||||||||
| Forward Exchange Contracts | Currency | 2026 | 2025 | ||||||||||||||
| Cross-Currency Intercompany Loans | SGD | SGD | 209.1 | SGD | 421.9 | ||||||||||||
| Cross-Currency Intercompany Demand Notes | EUR | € | 23.5 | € | 23.5 | ||||||||||||
| (in millions) | Sell | ||||||||||||||||
| Currency | Purchase | USD | EUR | ||||||||||||||
| EUR | 27.0 | 32.2 | — | ||||||||||||||
| JPY | 5,206.2 | 20.3 | 12.3 | ||||||||||||||
| SGD | 64.5 | 47.5 | 3.5 | ||||||||||||||
| Amount of Gain (Loss) Recognized in Income for the | Amount of Gain (Loss) Recognized in Income for the | ||||||||||||||||||||||||||||
| Three Months Ended June 30, | Six Months Ended June 30, | Location on Statement of Income | |||||||||||||||||||||||||||
| ($ in millions) | 2026 | 2025 | 2026 | 2025 | |||||||||||||||||||||||||
| Fair Value Hedges: | |||||||||||||||||||||||||||||
Hedged item (intercompany loan) | $ | (0.4) | $ | 0.1 | $ | (4.9) | $ | 3.4 | Other expense (income) | ||||||||||||||||||||
Derivative designated as hedging instrument | 0.4 | (0.1) | 4.9 | (3.4) | Other expense (income) | ||||||||||||||||||||||||
Amount excluded from effectiveness testing | 0.3 | (0.5) | (0.9) | (0.9) | Other expense (income) | ||||||||||||||||||||||||
| Total | $ | 0.3 | $ | (0.5) | $ | (0.9) | $ | (0.9) | |||||||||||||||||||||
| Amount of Gain (Loss) Recognized in OCI for the | Amount of (Gain) Loss Reclassified from Accumulated OCI into Income for the | Location of (Gain) Loss Reclassified from Accumulated OCI into Income | |||||||||||||||||||||||||||
| Three Months Ended June 30, | Three Months Ended June 30, | ||||||||||||||||||||||||||||
| ($ in millions) | 2026 | 2025 | 2026 | 2025 | |||||||||||||||||||||||||
| Fair Value Hedges: | |||||||||||||||||||||||||||||
| Foreign currency hedge contracts | $ | (0.1) | $ | 0.4 | $ | — | $ | — | Other expense (income) | ||||||||||||||||||||
| Total | $ | (0.1) | $ | 0.4 | $ | — | $ | — | |||||||||||||||||||||
| Cash Flow Hedges: | |||||||||||||||||||||||||||||
| Foreign currency hedge contracts | $ | (0.3) | $ | (1.9) | $ | 0.1 | $ | 0.3 | Net sales | ||||||||||||||||||||
| Foreign currency hedge contracts | (1.3) | 4.1 | 0.7 | (0.4) | Cost of goods and services sold | ||||||||||||||||||||||||
| Total | $ | (1.6) | $ | 2.2 | $ | 0.8 | $ | (0.1) | |||||||||||||||||||||
| Net Investment Hedges: | |||||||||||||||||||||||||||||
| Cross-currency swap | $ | 1.4 | $ | (3.5) | $ | — | $ | — | Other expense (income) | ||||||||||||||||||||
| Total | $ | 1.4 | $ | (3.5) | $ | — | $ | — | |||||||||||||||||||||
| Amount of Gain (Loss) Recognized in OCI for the | Amount of (Gain) Loss Reclassified from Accumulated OCI into Income for the | Location of (Gain) Loss Reclassified from Accumulated OCI into Income | |||||||||||||||||||||||||||
| Six Months Ended June 30, | Six Months Ended June 30, | ||||||||||||||||||||||||||||
| ($ in millions) | 2026 | 2025 | 2026 | 2025 | |||||||||||||||||||||||||
| Fair Value Hedges: | |||||||||||||||||||||||||||||
| Foreign currency hedge contracts | $ | 0.2 | $ | 0.8 | $ | — | $ | — | Other expense (income) | ||||||||||||||||||||
| Total | $ | 0.2 | $ | 0.8 | $ | — | $ | — | |||||||||||||||||||||
| Cash Flow Hedges: | |||||||||||||||||||||||||||||
| Foreign currency hedge contracts | $ | (0.1) | $ | (2.6) | $ | 0.4 | $ | 0.1 | Net sales | ||||||||||||||||||||
| Foreign currency hedge contracts | (2.6) | 6.5 | 1.1 | 0.2 | Cost of goods and services sold | ||||||||||||||||||||||||
| Forward treasury locks | — | — | — | — | Interest expense | ||||||||||||||||||||||||
| Total | $ | (2.7) | $ | 3.9 | $ | 1.5 | $ | 0.3 | |||||||||||||||||||||
| Net Investment Hedges: | |||||||||||||||||||||||||||||
| Cross-currency swap | $ | 1.8 | $ | (6.3) | $ | — | $ | — | Other expense (income) | ||||||||||||||||||||
| Total | $ | 1.8 | $ | (6.3) | $ | — | $ | — | |||||||||||||||||||||
| Three Months Ended June 30, | Six Months Ended June 30, | ||||||||||||||||||||||
| ($ in millions) | 2026 | 2025 | 2026 | 2025 | |||||||||||||||||||
| Net sales | $ | 0.1 | $ | 0.3 | $ | 0.4 | $ | 0.1 | |||||||||||||||
| Cost of goods and services sold | $ | 0.7 | $ | (0.4) | $ | 1.1 | $ | 0.2 | |||||||||||||||
| Interest expense | $ | — | $ | — | $ | — | $ | — | |||||||||||||||
| Amount of Gain (Loss) Recognized in Income for the | Amount of Gain (Loss) Recognized in Income for the | ||||||||||||||||||||||||||||
| Three Months Ended June 30, | Six Months Ended June 30, | Location on Statement of Income | |||||||||||||||||||||||||||
| ($ in millions) | 2026 | 2025 | 2026 | 2025 | |||||||||||||||||||||||||
| Commodity call options | $ | (0.9) | $ | (0.2) | $ | 1.0 | $ | (0.4) | Other expense (income) | ||||||||||||||||||||
| Currency Forwards | (0.3) | 0.8 | 1.2 | 0.8 | Other expense (income) | ||||||||||||||||||||||||
| Total | $ | (1.2) | $ | 0.6 | $ | 2.2 | $ | 0.4 | |||||||||||||||||||||
| Balance at | Basis of Fair Value Measurements | ||||||||||||||||||||||
| ($ in millions) | June 30, 2026 | Level 1 | Level 2 | Level 3 | |||||||||||||||||||
| Assets: | |||||||||||||||||||||||
| Deferred compensation assets | $ | 9.9 | $ | 9.9 | $ | — | $ | — | |||||||||||||||
| Money market funds | 100.7 | 100.7 | — | — | |||||||||||||||||||
| Time deposits | 47.0 | — | 47.0 | — | |||||||||||||||||||
| Foreign currency contracts | 3.9 | — | 3.9 | — | |||||||||||||||||||
| Cross-currency swap | 27.0 | — | 27.0 | — | |||||||||||||||||||
| Commodity call options | 1.5 | — | 1.5 | — | |||||||||||||||||||
| $ | 190.0 | $ | 110.6 | $ | 79.4 | $ | — | ||||||||||||||||
| Liabilities: | |||||||||||||||||||||||
| Contingent consideration | $ | 3.3 | $ | — | $ | — | $ | 3.3 | |||||||||||||||
| Deferred compensation liabilities | 10.0 | 10.0 | — | — | |||||||||||||||||||
| Foreign currency contracts | 5.3 | — | 5.3 | — | |||||||||||||||||||
| $ | 18.6 | $ | 10.0 | $ | 5.3 | $ | 3.3 | ||||||||||||||||
| Balance at | Basis of Fair Value Measurements | ||||||||||||||||||||||
| ($ in millions) | December 31, 2025 | Level 1 | Level 2 | Level 3 | |||||||||||||||||||
| Assets: | |||||||||||||||||||||||
| Deferred compensation assets | $ | 10.0 | $ | 10.0 | $ | — | $ | — | |||||||||||||||
| Money market funds | 443.9 | 443.9 | — | — | |||||||||||||||||||
| Time deposits | 41.6 | — | 41.6 | — | |||||||||||||||||||
| Foreign currency contracts | 0.2 | — | 0.2 | — | |||||||||||||||||||
| Cross-currency swap | 24.7 | — | 24.7 | — | |||||||||||||||||||
| Commodity call options | 0.3 | — | 0.3 | — | |||||||||||||||||||
| $ | 520.7 | $ | 453.9 | $ | 66.8 | $ | — | ||||||||||||||||
| Liabilities: | |||||||||||||||||||||||
| Contingent consideration | $ | 2.2 | $ | — | $ | — | $ | 2.2 | |||||||||||||||
| Deferred compensation liabilities | 10.1 | 10.1 | — | — | |||||||||||||||||||
| Foreign currency contracts | 7.6 | — | 7.6 | — | |||||||||||||||||||
| $ | 19.9 | $ | 10.1 | $ | 7.6 | $ | 2.2 | ||||||||||||||||
| ($ in millions) | Derivatives | Change in equity affiliate investment AOCI | Defined benefit pension and other postretirement plans | Foreign currency translation | Total | ||||||||||||||||||||||||
| Balance, December 31, 2025 | $ | (1.5) | $ | 3.2 | $ | (8.1) | $ | (99.1) | $ | (105.5) | |||||||||||||||||||
| Other comprehensive income (loss) before reclassifications | (2.5) | (0.1) | — | (33.6) | (36.2) | ||||||||||||||||||||||||
| Amounts reclassified out from accumulated other comprehensive income (loss) | 1.5 | — | (0.2) | — | 1.3 | ||||||||||||||||||||||||
| Other comprehensive income (loss), net of tax | (1.0) | (0.1) | (0.2) | (33.6) | (34.9) | ||||||||||||||||||||||||
| Balance, June 30, 2026 | $ | (2.5) | $ | 3.1 | $ | (8.3) | $ | (132.7) | $ | (140.4) | |||||||||||||||||||
| ($ in millions) | Derivatives | Change in equity affiliate investment AOCI | Defined benefit pension and other postretirement plans | Foreign currency translation | Total | ||||||||||||||||||||||||
Balance, December 31, 2024 | $ | (2.5) | $ | 2.5 | $ | (9.8) | $ | (248.3) | $ | (258.1) | |||||||||||||||||||
| Other comprehensive income (loss) before reclassifications | 4.7 | 0.2 | (0.9) | 165.3 | 169.3 | ||||||||||||||||||||||||
| Amounts reclassified out from accumulated other comprehensive income (loss) | 0.3 | — | (0.2) | — | 0.1 | ||||||||||||||||||||||||
| Other comprehensive income (loss), net of tax | 5.0 | 0.2 | (1.1) | 165.3 | 169.4 | ||||||||||||||||||||||||
Balance, June 30, 2025 | $ | 2.5 | $ | 2.7 | $ | (10.9) | $ | (83.0) | $ | (88.7) | |||||||||||||||||||
| ($ in millions) | Three Months Ended June 30, | Six Months Ended June 30, | ||||||||||||||||||||||||||||||
| Detail of components | 2026 | 2025 | 2026 | 2025 | Location on Statement of Income | |||||||||||||||||||||||||||
| (Losses) gains on derivatives: | ||||||||||||||||||||||||||||||||
| Foreign currency contracts | $ | (0.1) | $ | (0.3) | $ | (0.4) | $ | (0.1) | Net sales | |||||||||||||||||||||||
| Foreign currency contracts | (1.0) | 0.5 | (1.6) | (0.3) | Cost of goods and services sold | |||||||||||||||||||||||||||
| Forward treasury locks | — | (0.1) | — | (0.1) | Interest expense | |||||||||||||||||||||||||||
| Total before tax | (1.1) | 0.1 | (2.0) | (0.5) | ||||||||||||||||||||||||||||
| Tax benefit | 0.3 | — | 0.5 | 0.2 | ||||||||||||||||||||||||||||
| Net of tax | $ | (0.8) | $ | 0.1 | $ | (1.5) | $ | (0.3) | ||||||||||||||||||||||||
| Amortization of defined benefit pension and other postretirement plans: | ||||||||||||||||||||||||||||||||
| Actuarial gains | $ | — | $ | 0.2 | $ | 0.1 | $ | 0.3 | (a) | |||||||||||||||||||||||
| Other | — | — | 0.1 | — | ||||||||||||||||||||||||||||
| Total before tax | — | 0.2 | 0.2 | 0.3 | ||||||||||||||||||||||||||||
| Tax expense | — | (0.1) | — | (0.1) | ||||||||||||||||||||||||||||
| Net of tax | $ | — | $ | 0.1 | $ | 0.2 | $ | 0.2 | ||||||||||||||||||||||||
| Total reclassifications for the period, net of tax | $ | (0.8) | $ | 0.2 | $ | (1.3) | $ | (0.1) | ||||||||||||||||||||||||
| Common Shares Issued | Common Stock | Capital in Excess of Par Value | Number of Treasury Shares | Treasury Stock | Retained earnings | Accumulated other comprehensive loss | Total | ||||||||||||||||||||||||||||||||||||||||
| (in millions) | |||||||||||||||||||||||||||||||||||||||||||||||
| Balance, December 31, 2025 | 75.3 | $ | 18.8 | $ | — | 3.3 | $ | (1,112.2) | $ | 4,374.9 | $ | (105.5) | $ | 3,176.0 | |||||||||||||||||||||||||||||||||
| Net income | — | — | — | — | — | 138.8 | — | 138.8 | |||||||||||||||||||||||||||||||||||||||
| Activity related to stock-based compensation | — | — | — | (0.1) | 30.7 | (21.9) | — | 8.8 | |||||||||||||||||||||||||||||||||||||||
| Shares purchased under share repurchase program | — | — | — | 1.2 | (297.6) | — | — | (297.6) | |||||||||||||||||||||||||||||||||||||||
Dividends declared ($0.22 per share) | — | — | — | — | — | (15.9) | — | (15.9) | |||||||||||||||||||||||||||||||||||||||
| Other comprehensive loss, net of tax | — | — | — | — | — | — | (19.7) | (19.7) | |||||||||||||||||||||||||||||||||||||||
| Balance, March 31, 2026 | 75.3 | $ | 18.8 | $ | — | 4.4 | $ | (1,379.1) | $ | 4,475.9 | $ | (125.2) | $ | 2,990.4 | |||||||||||||||||||||||||||||||||
| Net income | — | — | — | — | — | 154.0 | — | 154.0 | |||||||||||||||||||||||||||||||||||||||
| Activity related to stock-based compensation | — | — | — | (0.1) | 23.5 | (5.8) | — | 17.7 | |||||||||||||||||||||||||||||||||||||||
| Shares purchased under share repurchase program | — | — | — | 0.6 | (156.7) | — | — | (156.7) | |||||||||||||||||||||||||||||||||||||||
| Other comprehensive loss, net of tax | — | — | — | — | — | — | (15.2) | (15.2) | |||||||||||||||||||||||||||||||||||||||
| Balance, June 30, 2026 | 75.3 | $ | 18.8 | $ | — | 4.9 | $ | (1,512.3) | $ | 4,624.1 | $ | (140.4) | $ | 2,990.2 | |||||||||||||||||||||||||||||||||
| Common Shares Issued | Common Stock | Capital in Excess of Par Value | Number of Treasury Shares | Treasury Stock | Retained earnings | Accumulated other comprehensive loss | Total | ||||||||||||||||||||||||||||||||||||||||
| (in millions) | |||||||||||||||||||||||||||||||||||||||||||||||
| Balance, December 31, 2024 | 75.3 | $ | 18.8 | $ | 22.1 | 3.0 | $ | (1,057.1) | $ | 3,956.6 | $ | (258.1) | $ | 2,682.3 | |||||||||||||||||||||||||||||||||
| Net income | — | — | — | — | — | 89.8 | — | 89.8 | |||||||||||||||||||||||||||||||||||||||
| Activity related to stock-based compensation | — | — | (20.3) | (0.1) | 27.4 | — | — | 7.1 | |||||||||||||||||||||||||||||||||||||||
| Shares purchased under share repurchase program | — | — | — | 0.6 | (133.5) | — | — | (133.5) | |||||||||||||||||||||||||||||||||||||||
Dividends declared ($0.21 per share) | — | — | — | — | — | (15.2) | — | (15.2) | |||||||||||||||||||||||||||||||||||||||
| Other comprehensive income, net of tax | — | — | — | — | — | — | 52.6 | 52.6 | |||||||||||||||||||||||||||||||||||||||
| Balance, March 31, 2025 | 75.3 | $ | 18.8 | $ | 1.8 | 3.5 | $ | (1,163.2) | $ | 4,031.2 | $ | (205.5) | $ | 2,683.1 | |||||||||||||||||||||||||||||||||
| Net income | — | — | — | — | — | 131.8 | — | 131.8 | |||||||||||||||||||||||||||||||||||||||
| Activity related to stock-based compensation | — | — | (1.8) | (0.1) | 23.5 | (8.8) | — | 12.9 | |||||||||||||||||||||||||||||||||||||||
| Shares purchased under share repurchase program | — | — | — | — | (0.5) | — | — | (0.5) | |||||||||||||||||||||||||||||||||||||||
Dividends declared ($0.21 per share) | — | — | — | — | — | (15.0) | — | (15.0) | |||||||||||||||||||||||||||||||||||||||
| Other comprehensive income, net of tax | — | — | — | — | — | — | 116.8 | 116.8 | |||||||||||||||||||||||||||||||||||||||
| Balance, June 30, 2025 | 75.3 | $ | 18.8 | $ | — | 3.4 | $ | (1,140.2) | $ | 4,139.2 | $ | (88.7) | $ | 2,929.1 | |||||||||||||||||||||||||||||||||
| Three Months Ended June 30, | Six Months Ended June 30, | ||||||||||||||||||||||
| ($ in millions) | 2026 | 2025 | 2026 | 2025 | |||||||||||||||||||
| Restructuring and related charges | $ | 2.3 | $ | 0.2 | $ | 4.1 | $ | 16.6 | |||||||||||||||
| Contingent consideration | 3.2 | 2.2 | 6.2 | 4.6 | |||||||||||||||||||
| Asset impairments | 3.9 | 0.8 | 4.2 | 1.1 | |||||||||||||||||||
| Foreign exchange transaction losses | 1.9 | 1.7 | 3.0 | 2.9 | |||||||||||||||||||
| (Gain) loss on oil hedges | 1.0 | 0.2 | (0.9) | 0.4 | |||||||||||||||||||
| Other items | 0.5 | 0.1 | 0.2 | 0.2 | |||||||||||||||||||
| Total other expense (income) | $ | 12.8 | $ | 5.2 | $ | 16.8 | $ | 25.8 | |||||||||||||||
| ($ in millions) | Severance and benefits | Asset-related charges | Total | ||||||||||||||
| Balance, December 31, 2025 | $ | 6.9 | $ | — | $ | 6.9 | |||||||||||
| Charges (Credits) | — | 1.9 | 1.9 | ||||||||||||||
| Cash payments | (0.2) | — | (0.2) | ||||||||||||||
| Non-cash asset write downs | — | (1.9) | (1.9) | ||||||||||||||
| Balance, June 30, 2026 | $ | 6.7 | $ | — | $ | 6.7 | |||||||||||
| ($ in millions) | Severance and benefits | Total | |||||||||
| Balance, December 31, 2025 | $ | 4.2 | $ | 4.2 | |||||||
| Charges (Credits) | 2.2 | 2.2 | |||||||||
| Balance, June 30, 2026 | $ | 6.4 | $ | 6.4 | |||||||
| Three Months Ended June 30, | Six Months Ended June 30, | ||||||||||||||||||||||
| ($ in millions) | 2026 | 2025 | 2026 | 2025 | |||||||||||||||||||
| Cost-method investment impairment charges | $ | 3.5 | $ | — | $ | 3.5 | $ | — | |||||||||||||||
| Fixed asset impairment expense | 0.4 | 0.8 | 0.7 | 1.1 | |||||||||||||||||||
| Total asset impairments | $ | 3.9 | $ | 0.8 | $ | 4.2 | $ | 1.1 | |||||||||||||||
| Three Months Ended June 30, | Six Months Ended June 30, | ||||||||||||||||||||||
| ($ in millions) | 2026 | 2025 | 2026 | 2025 | |||||||||||||||||||
| Net sales: | |||||||||||||||||||||||
| Proprietary Products | $ | 722.6 | $ | 619.8 | $ | 1,416.9 | $ | 1,182.8 | |||||||||||||||
| West Vantage | 149.7 | 146.7 | 300.3 | 281.7 | |||||||||||||||||||
| Consolidated net sales | $ | 872.3 | $ | 766.5 | $ | 1,717.2 | $ | 1,464.5 | |||||||||||||||
| ($ in millions) | June 30, 2026 | December 31, 2025 | |||||||||
| Assets | |||||||||||
| Proprietary Products | $ | 2,909.2 | $ | 2,987.0 | |||||||
| West Vantage | 717.7 | 718.1 | |||||||||
Corporate and Unallocated (1) | 449.5 | 564.9 | |||||||||
| Total consolidated | $ | 4,076.4 | $ | 4,270.0 | |||||||
| ($ in millions) | Three Months Ended June 30, | Six Months Ended June 30, | |||||||||||||||||||||
| Depreciation and Amortization | 2026 | 2025 | 2026 | 2025 | |||||||||||||||||||
| Proprietary Products | $ | 36.3 | $ | 33.7 | $ | 72.7 | $ | 66.4 | |||||||||||||||
| West Vantage | 9.2 | 6.8 | 17.2 | 13.2 | |||||||||||||||||||
| Corporate and Unallocated | 0.7 | 0.9 | 1.5 | 1.8 | |||||||||||||||||||
| Total consolidated | $ | 46.2 | $ | 41.4 | $ | 91.4 | $ | 81.4 | |||||||||||||||
| ($ in millions) | Three Months Ended June 30, | Six Months Ended June 30, | |||||||||||||||||||||
| Capital Expenditures | 2026 | 2025 | 2026 | 2025 | |||||||||||||||||||
| Proprietary Products | $ | 35.4 | $ | 48.5 | $ | 71.9 | $ | 100.4 | |||||||||||||||
| West Vantage | 5.1 | 25.5 | 10.7 | 43.6 | |||||||||||||||||||
| Corporate and Unallocated | 2.7 | 1.2 | 3.3 | 2.5 | |||||||||||||||||||
| Total consolidated | $ | 43.2 | $ | 75.2 | $ | 85.9 | $ | 146.5 | |||||||||||||||
| Three months ended June 30, 2026 | Three months ended June 30, 2025 | ||||||||||||||||||||||||||||||||||
| ($ in millions) | Proprietary Products | West Vantage | Total | Proprietary Products | West Vantage | Total | |||||||||||||||||||||||||||||
| Net sales | $ | 722.6 | $ | 149.7 | $ | 872.3 | $ | 619.8 | $ | 146.7 | $ | 766.5 | |||||||||||||||||||||||
| Cost of goods and services sold | 414.6 | 128.5 | 371.5 | 121.1 | |||||||||||||||||||||||||||||||
| Research and development | 19.7 | — | 19.1 | — | |||||||||||||||||||||||||||||||
| Selling, general and administrative expenses | 69.5 | 8.3 | 61.5 | 7.0 | |||||||||||||||||||||||||||||||
Other segment expense (income)(1) | 6.9 | — | 6.0 | 0.8 | |||||||||||||||||||||||||||||||
| Segment operating profit | $ | 211.9 | $ | 12.9 | $ | 224.8 | $ | 161.7 | $ | 17.8 | $ | 179.5 | |||||||||||||||||||||||
| Reconciliation of profit or loss: | |||||||||||||||||||||||||||||||||||
| Stock-based compensation | (10.9) | (7.4) | |||||||||||||||||||||||||||||||||
Corporate general costs(2) | (16.5) | (16.8) | |||||||||||||||||||||||||||||||||
| Unallocated items: | |||||||||||||||||||||||||||||||||||
Restructuring and other charges(3) | (1.5) | (1.6) | |||||||||||||||||||||||||||||||||
M&A activities, including SmartDose® 3.5mL sale(4) | (6.4) | — | |||||||||||||||||||||||||||||||||
Cost-method investment activity(5) | (3.5) | — | |||||||||||||||||||||||||||||||||
Other(7) | (6.9) | — | |||||||||||||||||||||||||||||||||
| Total consolidated operating profit | 179.1 | 153.7 | |||||||||||||||||||||||||||||||||
| Interest (income) expense and other nonoperating expense (income), net | (1.0) | (3.3) | |||||||||||||||||||||||||||||||||
| Income before income taxes and equity in net income of affiliated companies | $ | 180.1 | $ | 157.0 | |||||||||||||||||||||||||||||||
| Six Months June 30, 2026 | Six months ended June 30, 2025 | ||||||||||||||||||||||||||||||||||
| ($ in millions) | Proprietary Products | West Vantage | Total | Proprietary Products | West Vantage | Total | |||||||||||||||||||||||||||||
| Net sales | $ | 1,416.9 | $ | 300.3 | $ | 1,717.2 | $ | 1,182.8 | $ | 281.7 | $ | 1,464.5 | |||||||||||||||||||||||
| Cost of goods and services sold | 835.8 | 255.8 | 724.3 | 234.4 | |||||||||||||||||||||||||||||||
| Research and development | 35.5 | — | 35.4 | — | |||||||||||||||||||||||||||||||
| Selling, general and administrative expenses | 134.5 | 16.1 | 121.8 | 14.6 | |||||||||||||||||||||||||||||||
Other segment expense (income)(1) | 10.0 | (0.1) | 9.0 | 1.4 | |||||||||||||||||||||||||||||||
| Segment operating profit | $ | 401.1 | $ | 28.5 | $ | 429.6 | $ | 292.3 | $ | 31.3 | $ | 323.6 | |||||||||||||||||||||||
| Reconciliation of profit or loss: | |||||||||||||||||||||||||||||||||||
| Stock-based compensation | (17.5) | (8.7) | |||||||||||||||||||||||||||||||||
Corporate general costs(2) | (33.7) | (34.6) | |||||||||||||||||||||||||||||||||
| Unallocated items: | |||||||||||||||||||||||||||||||||||
Restructuring and related charges(3) | (2.9) | (19.4) | |||||||||||||||||||||||||||||||||
M&A activities, including SmartDose® 3.5mL sale(4) | (8.3) | — | |||||||||||||||||||||||||||||||||
Cost-method investment activity(5) | (3.5) | — | |||||||||||||||||||||||||||||||||
Amortization of acquisition-related intangible assets(6) | — | (0.2) | |||||||||||||||||||||||||||||||||
Other(7) | (7.5) | — | |||||||||||||||||||||||||||||||||
| Total consolidated operating profit | 356.2 | 260.7 | |||||||||||||||||||||||||||||||||
| Interest (income) expense and other nonoperating expense (income), net | (4.0) | (6.8) | |||||||||||||||||||||||||||||||||
| Income before income taxes and equity in net income of affiliated companies | $ | 360.2 | $ | 267.5 | |||||||||||||||||||||||||||||||
| ($ in millions, except per share data) | Operating Profit | Income tax expense | Net income | Diluted EPS | |||||||||||||||||||
Three months ended June 30, 2026 U.S. GAAP | $ | 179.1 | $ | 32.2 | $ | 154.0 | $ | 2.15 | |||||||||||||||
| Unallocated items: | |||||||||||||||||||||||
Restructuring and other charges(1) | 1.5 | 0.3 | 1.2 | 0.02 | |||||||||||||||||||
M&A activities, including SmartDose® 3.5mL sale(2) | 6.4 | 1.5 | 4.9 | 0.07 | |||||||||||||||||||
Cost-method investment activity(3) | 3.5 | — | 3.5 | 0.05 | |||||||||||||||||||
Amortization of acquisition-related intangible assets(4) | — | — | 0.4 | — | |||||||||||||||||||
Other(5) | 6.9 | 1.4 | 5.4 | 0.08 | |||||||||||||||||||
Three months ended June 30, 2026 adjusted amounts (non-U.S. GAAP) | $ | 197.4 | $ | 35.4 | $ | 169.4 | $ | 2.37 | |||||||||||||||
| ($ in millions, except per share data) | Operating profit | Income tax expense | Net income | Diluted EPS | |||||||||||||||||||
Six months ended June 30, 2026 U.S. GAAP | $ | 356.2 | $ | 76.9 | $ | 292.8 | $ | 4.07 | |||||||||||||||
| Unallocated items: | |||||||||||||||||||||||
Restructuring and other charges(1) | 2.9 | (11.3) | 14.2 | 0.20 | |||||||||||||||||||
M&A activities, including SmartDose® 3.5mL sale(2) | 8.3 | 1.9 | 6.4 | 0.09 | |||||||||||||||||||
Cost-method investment activity(3) | 3.5 | — | 3.5 | 0.05 | |||||||||||||||||||
Amortization of acquisition-related intangible assets(4) | — | — | 0.9 | 0.01 | |||||||||||||||||||
Other(5) | 7.5 | 1.6 | 5.9 | 0.08 | |||||||||||||||||||
Six months ended June 30, 2026 adjusted amounts (non-U.S. GAAP) | $ | 378.4 | $ | 69.1 | $ | 323.7 | $ | 4.50 | |||||||||||||||
| ($ in millions, except per share data) | Operating Profit | Income tax expense | Net income | Diluted EPS | |||||||||||||||||||
Three months ended June 30, 2025 U.S. GAAP | $ | 153.7 | $ | 30.2 | $ | 131.8 | $ | 1.82 | |||||||||||||||
| Unallocated items: | |||||||||||||||||||||||
Restructuring and other charges(1) | 1.6 | 0.4 | 1.2 | 0.02 | |||||||||||||||||||
Amortization of acquisition-related intangible assets(4) | — | — | 0.5 | — | |||||||||||||||||||
Three months ended June 30, 2025 adjusted amounts (non-U.S. GAAP) | $ | 155.3 | $ | 30.6 | $ | 133.5 | $ | 1.84 | |||||||||||||||
| ($ in millions, except per share data) | Operating Profit | Income tax expense | Net income | Diluted EPS | |||||||||||||||||||
Six months ended June 30, 2025 U.S. GAAP | $ | 260.7 | $ | 54.3 | $ | 221.6 | $ | 3.05 | |||||||||||||||
| Unallocated items: | |||||||||||||||||||||||
Restructuring and other charges(1) | 19.4 | 2.4 | 17.0 | 0.23 | |||||||||||||||||||
Amortization of acquisition-related intangible assets(4) | 0.2 | — | 1.1 | 0.01 | |||||||||||||||||||
Six months ended June 30, 2025 adjusted amounts (non-U.S. GAAP) | $ | 280.3 | $ | 56.7 | $ | 239.7 | $ | 3.29 | |||||||||||||||
| Three Months Ended June 30, | Percentage Change | ||||||||||||||||||||||
| ($ in millions) | 2026 | 2025 | As-Reported | Organic | |||||||||||||||||||
| Proprietary Products | $ | 722.6 | $ | 619.8 | 16.6 | % | 15.5 | % | |||||||||||||||
| West Vantage | 149.7 | 146.7 | 2.0 | % | 0.8 | % | |||||||||||||||||
| Consolidated net sales | $ | 872.3 | $ | 766.5 | 13.8 | % | 12.7 | % | |||||||||||||||
| Six Months Ended June 30, | Percentage Change | ||||||||||||||||||||||
| ($ in millions) | 2026 | 2025 | As-Reported | Organic | |||||||||||||||||||
| Proprietary Products | $ | 1,416.9 | $ | 1,182.8 | 19.8 | % | 16.5 | % | |||||||||||||||
| West Vantage | 300.3 | 281.7 | 6.6 | % | 3.4 | % | |||||||||||||||||
| Consolidated net sales | $ | 1,717.2 | $ | 1,464.5 | 17.3 | % | 13.9 | % | |||||||||||||||
| Three Months Ended June 30, | Six Months Ended June 30, | ||||||||||||||||||||||
| ($ in millions) | 2026 | 2025 | 2026 | 2025 | |||||||||||||||||||
| Proprietary Products: | |||||||||||||||||||||||
| Gross profit | $ | 308.0 | $ | 248.3 | $ | 581.1 | $ | 458.5 | |||||||||||||||
| Gross profit margin | 42.6 | % | 40.1 | % | 41.0 | % | 38.8 | % | |||||||||||||||
| West Vantage: | |||||||||||||||||||||||
| Gross profit | $ | 21.2 | $ | 25.6 | $ | 44.5 | $ | 47.3 | |||||||||||||||
| Gross profit margin | 14.2 | % | 17.5 | % | 14.8 | % | 16.8 | % | |||||||||||||||
| Consolidated gross profit | $ | 329.2 | $ | 273.9 | $ | 625.6 | $ | 505.8 | |||||||||||||||
| Consolidated gross profit margin | 37.7 | % | 35.7 | % | 36.4 | % | 34.5 | % | |||||||||||||||
| Three Months Ended June 30, | Six Months Ended June 30, | ||||||||||||||||||||||
| ($ in millions) | 2026 | 2025 | 2026 | 2025 | |||||||||||||||||||
| Consolidated R&D costs | $ | 19.7 | $ | 19.1 | $ | 35.5 | $ | 35.4 | |||||||||||||||
| Three Months Ended June 30, | Six Months Ended June 30, | ||||||||||||||||||||||
| ($ in millions) | 2026 | 2025 | 2026 | 2025 | |||||||||||||||||||
| Proprietary Products | $ | 69.5 | $ | 61.5 | $ | 134.5 | $ | 121.8 | |||||||||||||||
| West Vantage | 8.3 | 7.0 | 16.1 | 14.6 | |||||||||||||||||||
| Corporate and unallocated items | 39.8 | 27.4 | 66.5 | 47.5 | |||||||||||||||||||
| Consolidated SG&A costs | $ | 117.6 | $ | 95.9 | $ | 217.1 | $ | 183.9 | |||||||||||||||
| SG&A as a % of net sales | 13.5 | % | 12.5 | % | 12.6 | % | 12.6 | % | |||||||||||||||
| Expense (Income) | Three Months Ended June 30, | Six Months Ended June 30, | |||||||||||||||||||||
| ($ in millions) | 2026 | 2025 | 2026 | 2025 | |||||||||||||||||||
| Proprietary Products | $ | 6.9 | $ | 6.0 | $ | 10.0 | $ | 9.0 | |||||||||||||||
| West Vantage | — | 0.8 | (0.1) | 1.4 | |||||||||||||||||||
| Corporate and unallocated | 5.9 | (1.6) | 6.9 | 15.4 | |||||||||||||||||||
| Consolidated other expense (income) | $ | 12.8 | $ | 5.2 | $ | 16.8 | $ | 25.8 | |||||||||||||||
| Three Months Ended June 30, | Six Months Ended June 30, | ||||||||||||||||||||||
| ($ in millions) | 2026 | 2025 | 2026 | 2025 | |||||||||||||||||||
| Proprietary Products | $ | 211.9 | $ | 161.7 | $ | 401.1 | $ | 292.3 | |||||||||||||||
| West Vantage | 12.9 | 17.8 | 28.5 | 31.3 | |||||||||||||||||||
| Corporate and unallocated items | (45.7) | (25.8) | (73.4) | (62.9) | |||||||||||||||||||
| Consolidated operating profit | $ | 179.1 | $ | 153.7 | $ | 356.2 | $ | 260.7 | |||||||||||||||
| Consolidated operating profit margin | 20.5 | % | 20.1 | % | 20.7 | % | 17.8 | % | |||||||||||||||
| Unallocated items | 18.3 | 1.6 | 22.2 | 19.6 | |||||||||||||||||||
| Adjusted consolidated operating profit | $ | 197.4 | $ | 155.3 | $ | 378.4 | $ | 280.3 | |||||||||||||||
| Adjusted consolidated operating profit margin | 22.6 | % | 20.3 | % | 22.0 | % | 19.1 | % | |||||||||||||||
| Three Months Ended June 30, | Six Months Ended June 30, | ||||||||||||||||||||||
| ($ in millions) | 2026 | 2025 | 2026 | 2025 | |||||||||||||||||||
| Interest expense | $ | 3.8 | $ | 4.1 | $ | 7.5 | $ | 8.3 | |||||||||||||||
| Capitalized interest | (1.2) | (4.0) | (3.0) | (7.8) | |||||||||||||||||||
| Interest expense, net | $ | 2.6 | $ | 0.1 | $ | 4.5 | $ | 0.5 | |||||||||||||||
| Interest income | $ | (3.8) | $ | (3.6) | $ | (8.9) | $ | (7.7) | |||||||||||||||
| ($ in millions) | 2026 | 2025 | |||||||||
| Net cash provided by operating activities | $ | 213.9 | $ | 306.5 | |||||||
| Net cash used in investing activities | $ | (85.9) | $ | (146.5) | |||||||
| Net cash used in financing activities | $ | (473.5) | $ | (161.9) | |||||||
| ($ in millions) | June 30, 2026 | December 31, 2025 | |||||||||
| Cash and cash equivalents | $ | 435.8 | $ | 791.3 | |||||||
| Accounts receivable, net | $ | 712.0 | $ | 574.4 | |||||||
| Inventories | $ | 447.4 | $ | 443.9 | |||||||
| Accounts payable | $ | 252.7 | $ | 253.7 | |||||||
| Debt | $ | 202.9 | $ | 202.8 | |||||||
| Equity | $ | 2,990.2 | $ | 3,176.0 | |||||||
| Working capital | $ | 1,167.0 | $ | 1,323.3 | |||||||
| Period | Total number of shares purchased (1) | Average price paid per share (1) | Total number of shares purchased as part of publicly announced plans or programs (1) | Approximate dollar value of shares that may yet be purchased under the plans or programs (1) | ||||||||||||||||||||||
April 1 - 30, 2026 | 273,854 | $ | 269.93 | 273,854 | $ | 630,070,000 | ||||||||||||||||||||
May 1 - 31, 2026 | 134,771 | $ | 309.50 | 134,771 | 588,360,000 | |||||||||||||||||||||
June 1 - 30, 2026 | 129,966 | $ | 328.13 | 129,966 | 545,720,000 | |||||||||||||||||||||
| Total | 538,591 | $ | 290.82 | 538,591 | 545,720,000 | |||||||||||||||||||||
| Exhibit Number | Description | ||||
| 3.1 | |||||
| 3.2 | |||||
| 4.1 | |||||
| 4.2 | |||||
| 4.3 | |||||
4.4 (1) | Instruments defining the rights of holders of long-term debt securities of West and its subsidiaries have been omitted. | ||||
| 10.1 | |||||
| 31.1 | |||||
| 31.2 | |||||
| 32.1* | |||||
| 32.2* | |||||
| 101.INS | The instance document does not appear in the interactive data file because its XBRL tags are embedded within the inline XBRL document. | ||||
| 101.SCH | Inline XBRL Taxonomy Extension Schema Document | ||||
| 101.CAL | Inline XBRL Taxonomy Extension Calculation Linkbase Document | ||||
| 101.LAB | Inline XBRL Taxonomy Extension Label Linkbase Document | ||||
| 101.PRE | Inline XBRL Taxonomy Extension Presentation Linkbase Document | ||||
| 101.DEF | Inline XBRL Taxonomy Extension Definition Linkbase Document | ||||
| 104 | Inline XBRL for the cover page of this Quarterly Report on Form 10-Q, included in the Exhibit 101 Inline XBRL Document Set. | ||||