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Income taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Income Tax Disclosure [Abstract] |  |
Property, plant and equipment | $ (104,162) | $ (97,806)
Intangibles | (104,171) | (96,057)
Leases | (89,226) | (75,587)
Outside basis in Metal Packaging | (74,092) | 0
Gross deferred tax liabilities | (371,651) | (269,450)
Retiree health benefits | 1,222 | 2,935
Foreign loss carryforwards | 79,460 | 76,462
U.S. Federal loss and credit carryforwards | 36,529 | 34,700
Capital loss carryforwards | 3,626 | 4,050
U.S. State loss and credit carryforwards | 20,961 | 21,900
Capitalized research and development costs | 45,826 | 22,875
Employee benefits | 42,641 | 46,503
Leases | 89,416 | 78,518
Accrued liabilities and other assets | 56,601 | 30,835
Gross deferred tax assets | 376,282 | 318,778
Valuation allowance on deferred tax assets | (82,046) | (93,992)
Total deferred taxes, net | $ (77,415) | $ (44,664)

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