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Stockholders' Equity - Reclassifications Out of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]      
Interest expense, net $ (70.4) $ (152.4) $ (93.5)
Income before taxes 1,364.8 1,108.7 632.7
Income tax benefit (335.0) (267.6) (171.7)
Net income 1,029.8 841.1 $ 461.0
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] (3.2) (3.4)  
Amortization of actuarial gains / (losses) [1] (3.0) (9.9)  
Income before taxes (6.2) (13.3)  
Income tax benefit 1.5 3.3  
Net income $ (4.7) $ (10.0)  
[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.