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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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Income before taxes $ 333.9 $ 185.7 $ 828.3 $ 467.3
Income tax benefit (83.2) (46.6) (203.7) (129.9)
Net income 250.7 139.1 624.6 337.4
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] (0.8) (1.0) (2.5) (3.0)
Amortization of actuarial losses [1] (2.5) (2.6) (7.5) (7.8)
Income before taxes (3.3) (3.6) (10.0) (10.8)
Income tax benefit 0.8 0.9 2.5 2.7
Net income $ (2.5) $ (2.7) $ (7.5) $ (8.1)
[1] These AOCI components are included in the computation of net pension and postretirement benefit costs. See Note 13, Employee Benefit Plans and Other Postretirement Benefits, for additional information.