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Accumulated Other Comprehensive Loss - Amounts Reclassified Out of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other (expense), net $ 9.4 $ 16.7 $ 151.5 $ 213.6
Total before tax (6.3) 24.1 126.0 178.7
Income tax 18.8 15.4 35.8 35.3
Reclassification out of Accumulated Other Comprehensive Loss        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total before tax 19.4 18.1 166.7 218.0
Income tax (0.8) (0.4) (1.6) (0.8)
Total reclassifications for the period 18.6 17.7 165.1 217.2
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 1.2 0.1 1.7 (3.4)
Reclassification out of Accumulated Other Comprehensive Loss | Amortization of prior service benefit        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other (expense), net (0.9) (1.3) (1.9) (2.6)
Reclassification out of Accumulated Other Comprehensive Loss | Amortization of actuarial losses        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other (expense), net 19.1 19.3 41.4 40.8
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