XML 81 R71.htm IDEA: XBRL DOCUMENT v3.23.3
Stockholders' Equity - Reclassifications Out of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Income before taxes $ 244.5 $ 347.4 $ 765.6 $ 1,088.3
Income tax benefit (61.3) (84.9) (189.6) (270.1)
Net income 183.2 262.5 576.0 818.2
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] (1.2) (0.8) (3.6) (2.4)
Amortization of actuarial losses [1] (0.9) (0.8) (2.8) (2.3)
Income before taxes (2.1) (1.6) (6.4) (4.7)
Income tax benefit 0.5 0.4 1.6 1.2
Net income $ (1.6) $ (1.2) $ (4.8) $ (3.5)
[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.