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Income taxes - Reconciliation (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Income Tax Disclosure [Abstract]      
U.S. $ (355.5) $ (805.1) $ (442.6)
International 212.6 73.9 224.0
Loss before income taxes (142.9) (731.2) (218.6)
Federal tax at statutory rates (30.0) (153.6) (46.0)
State taxes, net of federal benefit (28.6) (52.7) (13.5)
Impact of foreign operations 1.5 (8.5) (7.2)
Change in valuation allowance 80.2 193.6 37.8
Tax credits (0.2) (0.9) (3.5)
Pillar Two tax 6.8 0.0 0.0
Stock compensation 4.1 6.8 4.7
Goodwill Impairments 0.0 23.3 1.8
Adjustment of prior year taxes 0.4 1.3 (1.8)
Compensation limitation 1.7 0.3 0.7
Unrecognized tax benefit (3.5) (0.6) (9.0)
Impact of divestitures (3.9) 1.0 0.0
GILTI, net 15.8 17.8 20.7
Foreign withholding tax 3.5 0.8 4.7
Permanent differences (0.1) 0.7 3.2
Income tax (benefit) provision $ 47.7 $ 29.3 $ (7.4)