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Stockholders' equity - Amounts Reclassified Out of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other (expense), net $ 140.8 $ 393.9 $ 82.4
Total before tax 75.3 347.8 62.6
Income tax 117.9 79.3 42.3
Reclassification out of Accumulated Other Comprehensive Income      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Total before tax 212.1 420.3 156.1
Income tax (4.0) (1.8) (6.0)
Total reclassifications for the period 208.1 418.5 150.1
Reclassification out of Accumulated Other Comprehensive Income | Translation Adjustments      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other (expense), net 2.6 (3.7) 2.9
Reclassification out of Accumulated Other Comprehensive Income | Amortization of prior service credit      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other (expense), net (5.4) (5.4) (5.8)
Reclassification out of Accumulated Other Comprehensive Income | Amortization of actuarial losses      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other (expense), net 84.3 80.5 159.0
Reclassification out of Accumulated Other Comprehensive Income | Settlement losses      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other (expense), net $ 130.6 $ 348.9 $ 0.0