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Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - 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 (Loss) $ (5.9) $ 24.8 $ 22.7 $ 68.1
Other comprehensive income (loss), net of benefit (provision) for income taxes of $(0.1) million and $0.2 million for the three months ended September 30, 2024 and 2023, and net of benefit (provision) for incomes taxes of $(0.1) million and none for the nine months ended September 30, 2024 and 2023        
Foreign currency translation adjustments 0.2 (0.7) (0.3) (0.5)
Pension and postretirement liability adjustments (1.4) (1.1) (3.7) (2.5)
Other comprehensive income (loss), net of tax (1.2) (1.8) (4.0) (3.0)
Comprehensive Income (Loss), net of tax $ (7.1) $ 23.0 $ 18.7 $ 65.1