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Income taxes - Reconciliation of the Provision for Income Taxes (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Income Tax Disclosure [Abstract]      
U.S. statutory income tax benefit $ (15.8) $ (73.0) $ (13.2)
Income and losses for which no provision or benefit has been recognized 63.0 123.2 40.9
Foreign rate differential and other foreign tax expense 8.9 12.7 6.4
Income tax withholdings 23.0 14.0 19.7
Additional tax expense on undistributed earnings of certain foreign subsidiaries 27.3 0.0 0.0
Permanent items 1.2 (3.0) (2.1)
Change in uncertain tax positions 1.3 3.8 0.4
Change in valuation allowances 7.9 2.1 (9.8)
U.S. income tax benefit 0.0 (0.6) 0.0
Other 1.1 0.1 0.0
Total provision for income taxes $ 117.9 $ 79.3 $ 42.3