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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 (loss) $ (6.3) $ 17.2
Defined benefit pension and other postretirement employee benefits:    
Amortization of actuarial gain included in net periodic cost, net of immaterial tax 0.0 0.0
Other comprehensive income (loss), net of tax 0.0 0.0
Comprehensive income (loss) $ (6.3) $ 17.2