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Income taxes - Valuation Allowance (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Movement In Deferred Tax Assets, Valuation Allowance [Roll Forward]      
Valuation allowance, at beginning of year $ (1,150.1) $ (1,110.5) $ (1,226.2)
Increase (decrease) in valuation allowance (7.9)    
Valuation allowance, at end of year (1,168.6) (1,150.1) (1,110.5)
Change in valuation allowances 7.9 2.1 (9.8)
Actuarial pension adjustments      
Movement In Deferred Tax Assets, Valuation Allowance [Roll Forward]      
Increase (decrease) in valuation allowance 24.8 84.5 70.7
Expired net operating losses/tax credits      
Movement In Deferred Tax Assets, Valuation Allowance [Roll Forward]      
Increase (decrease) in valuation allowance 35.2 42.9 52.3
Foreign exchange      
Movement In Deferred Tax Assets, Valuation Allowance [Roll Forward]      
Increase (decrease) in valuation allowance 15.5 (6.8) 14.8
Recognition of income tax benefit (expense)      
Movement In Deferred Tax Assets, Valuation Allowance [Roll Forward]      
Increase (decrease) in valuation allowance (56.0) (125.9) (43.9)
Other      
Movement In Deferred Tax Assets, Valuation Allowance [Roll Forward]      
Increase (decrease) in valuation allowance (38.0) (34.3) 21.8
US Pension Activity      
Movement In Deferred Tax Assets, Valuation Allowance [Roll Forward]      
Change in valuation allowances $ (44.8) $ (95.9) $ (11.3)