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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Statement of Comprehensive Income [Abstract]        
Net income $ (26.0) $ 209.2 $ 12.0 $ 254.2
Postretirement plans (net of $0.0 tax provisions in each period) (10.2) (13.3) (20.4) (26.5)
Foreign currency translation adjustment 1.8 0.5 2.2 (1.4)
Other comprehensive loss, net of income taxes (8.4) (12.8) (18.2) (27.9)
Comprehensive (loss) income (34.4) 196.4 (6.2) 226.3
Less: Net income attributable to noncontrolling interests 1.6 9.8 5.2 15.2
Comprehensive (loss) income attributable to common stockholders $ (36.0) $ 186.6 $ (11.4) $ 211.1