v3.26.3
Accumulated Other Comprehensive Loss - Amounts Reclassified Out of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Jun. 30, 2026
Mar. 31, 2026
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2026
Sep. 30, 2025
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Other (expense), net $ 183.2     $ 241.2     $ 232.6 $ 280.2
Total before tax 178.5     292.9     281.4 312.9
Income tax 21.8     16.3     51.3 46.9
Total reclassifications for the period 200.3 $ 95.6 $ 36.8 309.2 $ 20.0 $ 30.6 332.7 359.8
Reclassification out of Accumulated Other Comprehensive Loss                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Total before tax 146.8     231.7     195.8 273.3
Income tax (1.4)     (1.0)     (4.2) (3.0)
Total reclassifications for the period 145.4     230.7     191.6 270.3
Reclassification out of Accumulated Other Comprehensive Loss | Adjustment for substantial completion of liquidation of certain foreign subsidiaries                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Other (expense), net 0.0     0.0     (0.1) (2.7)
Reclassification out of Accumulated Other Comprehensive Loss | Amortization of prior service benefit                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Other (expense), net (0.9)     (0.9)     (2.6) (2.7)
Reclassification out of Accumulated Other Comprehensive Loss | Amortization of actuarial losses                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Other (expense), net 26.3     23.9     77.1 70.0
Reclassification out of Accumulated Other Comprehensive Loss | Settlement losses                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Other (expense), net $ 121.4     $ 208.7     $ 121.4 $ 208.7