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CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Statement of Comprehensive Income [Abstract]      
Net income $ 815.6 $ 1,319.1 $ 371.4
Postretirement plans (net of $0.0 tax provisions in each period) (53.8) (53.8) 93.1
Foreign currency translation adjustment 0.9 (1.6) (1.0)
Other comprehensive (loss) income, net of income taxes (52.9) (55.4) 92.1
Comprehensive income 762.7 1,263.7 463.5
Less: Net income attributable to noncontrolling interests 56.0 22.0 11.3
Comprehensive income attributable to common stockholders $ 706.7 $ 1,241.7 $ 452.2