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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Statement of Comprehensive Income [Abstract]    
Net income $ 38.0 $ 45.0
Postretirement plans (net of $0.0 tax provisions in each period) (10.2) (13.2)
Foreign currency translation adjustment 0.4 (1.9)
Other comprehensive loss, net of income taxes (9.8) (15.1)
Comprehensive income 28.2 29.9
Less: Net income attributable to noncontrolling interests 3.6 5.4
Comprehensive income attributable to common stockholders $ 24.6 $ 24.5