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Stockholders' Equity - Reclassifications Out of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Income before taxes $ 305.2 $ 318.6 $ 893.3 $ 772.8
Income tax benefit (78.3) (80.5) (221.0) (188.8)
Net income 226.9 238.1 672.3 584.0
Unfunded Employee Benefit Obligations | Reclassification out of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Amortization of prior service costs [1] (1.3) (1.3) (3.9) (3.8)
Amortization of actuarial losses [1] 0.0 (0.1) 0.2 (0.3)
Income before taxes (1.3) (1.4) (3.7) (4.1)
Income tax benefit 0.3 0.4 0.9 1.0
Net income $ (1.0) $ (1.0) $ (2.8) $ (3.1)
[1] These AOCI components are included in the computation of net pension and postretirement benefit costs. See Note 14, Employee Benefit Plans and Other Postretirement Benefits, for additional information.