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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 (loss) $ 2.7 $ (25.8) $ (3.6) $ (8.6)
Defined benefit pension and other postretirement employee benefits:        
Amortization of actuarial gain (loss) included in net periodic cost, net of immaterial tax 0.0 0.0 0.1 (0.1)
Other comprehensive income (loss), net of tax 0.0 0.0 0.1 (0.1)
Comprehensive income (loss) $ 2.7 $ (25.8) $ (3.5) $ (8.7)