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Accumulated Other Comprehensive Loss - Amounts Reclassified Out of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other (expense), net $ 16.9 $ 142.1
Total before tax 20.0 132.3
Income tax 10.6 17.0
Reclassification out of Accumulated Other Comprehensive Loss    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total before tax 20.9 147.3
Income tax (1.4) (0.8)
Total reclassifications for the period 19.5 146.5
Reclassification out of Accumulated Other Comprehensive Loss | Adjustment for substantial completion of liquidation of foreign subsidiaries    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other (expense), net (1.1) 0.5
Reclassification out of Accumulated Other Comprehensive Loss | Amortization of prior service benefit    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other (expense), net (0.9) (1.0)
Reclassification out of Accumulated Other Comprehensive Loss | Amortization of actuarial losses    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other (expense), net 22.9 22.3
Reclassification out of Accumulated Other Comprehensive Loss | Settlement losses    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other (expense), net $ 0.0 $ 125.5