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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Statement of Comprehensive Income [Abstract]        
Net income $ 111.5 $ 131.3 $ 365.7 $ 616.9
Postretirement plans (net of $0.0 tax provisions in each period) (13.3) (13.5) (39.8) (40.3)
Foreign currency translation adjustment 2.3 (1.0) 0.9 (1.6)
Other comprehensive loss, net of income taxes (11.0) (14.5) (38.9) (41.9)
Comprehensive income 100.5 116.8 326.8 575.0
Less: Net income attributable to noncontrolling interests 10.2 11.4 25.4 49.3
Comprehensive income attributable to common stockholders $ 90.3 $ 105.4 $ 301.4 $ 525.7