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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, 2024
Mar. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other (expense), net $ 142.1 $ 196.9
Total before tax 132.3 154.6
Income tax 17.0 19.9
Reclassification out of Accumulated Other Comprehensive Loss    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total before tax 147.3 199.9
Income tax (0.8) (0.4)
Total reclassifications for the period 146.5 199.5
Reclassification out of Accumulated Other Comprehensive Loss | Translation Adjustments, Adjustment for substantial completion of liquidation of foreign subsidiaries    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other (expense), net 0.5 (3.5)
Reclassification out of Accumulated Other Comprehensive Loss | Amortization of prior service benefit    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other (expense), net (1.0) (1.3)
Reclassification out of Accumulated Other Comprehensive Loss | Amortization of actuarial losses    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other (expense), net 22.3 21.5
Reclassification out of Accumulated Other Comprehensive Loss | Settlement losses    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other (expense), net $ 125.5 $ 183.2