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Accumulated Other Comprehensive Loss - Amounts Reclassified Out of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other (expense), net $ 8.2 $ 3.6 $ 159.7 $ 217.2
Total before tax 8.6 28.5 134.6 207.2
Income tax 53.3 20.4 89.1 55.7
Reclassification out of Accumulated Other Comprehensive Loss        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total before tax 16.9 19.6 183.6 237.6
Income tax (0.8) (0.4) (2.4) (1.2)
Total reclassifications for the period 16.1 19.2 181.2 236.4
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 (0.7) 0.5 1.0 (2.9)
Reclassification out of Accumulated Other Comprehensive Loss | Amortization of prior service benefit        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other (expense), net (0.9) (1.4) (2.8) (4.0)
Reclassification out of Accumulated Other Comprehensive Loss | Amortization of actuarial losses        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other (expense), net 18.5 20.5 59.9 61.3
Reclassification out of Accumulated Other Comprehensive Loss | Settlement losses        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other (expense), net $ 0.0 $ 0.0 $ 125.5 $ 183.2