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Income taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Income Tax Disclosure [Abstract] |  |
Property, plant and equipment | $ (266,278) | $ (137,880)
Intangibles | (545,330) | (119,225)
Leases | (76,225) | (48,832)
Outside basis in Metal Packaging | (68,649) | (68,867)
Gross deferred tax liabilities | (956,482) | (374,804)
Retiree health benefits | 245 | 513
Foreign loss carryforwards | 79,314 | 62,250
U.S. Federal loss and credit carryforwards | 34,082 | 39,131
Capital loss carryforwards | 3,755 | 3,817
U.S. State loss and credit carryforwards | 26,181 | 21,321
Capitalized research and development costs | 103,043 | 87,743
Employee benefits | 56,192 | 51,829
Leases | 82,031 | 50,704
Accrued liabilities and other assets | 71,370 | 58,699
Gross deferred tax assets | 456,213 | 376,007
Valuation allowance on deferred tax assets | (81,496) | (70,661)
Total deferred taxes, net | (581,765) | (69,458)
Deferred taxes, net, discontinued operations | (15,666) | (6,228)
Deferred tax assets, valuation allowance, discontinued operations | $ (4,628) | $ (4,395)

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