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Stockholders' Equity - Reclassifications Out of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Income before taxes $ 274.7 $ 91.6 $ 494.3 $ 281.7
Income tax benefit (67.4) (34.9) (120.5) (83.4)
Net income 207.3 56.7 373.8 198.3
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) (1.7) (2.0)
Amortization of actuarial losses [1] (2.5) (2.6) (5.0) (5.2)
Income before taxes (3.3) (3.6) (6.7) (7.2)
Income tax benefit 0.8 0.9 1.7 1.8
Net income $ (2.5) $ (2.7) $ (5.0) $ (5.4)
[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.