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Consolidated Statement of Comprehensive Income (Loss) (Unaudited) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Statement of Comprehensive Income [Abstract]        
Net Income (Loss) $ 8.1 $ (5.9) $ 13.1 $ 22.7
Other comprehensive income (loss), net of benefit (provision) for income taxes of none and $(0.1) million for the three months ended September 30, 2025 and 2024, and net of benefit (provision) for incomes taxes of $(0.3) million and $(0.1) million for the nine months ended September 30, 2025 and 2024        
Foreign currency translation adjustments (0.1) 0.2 1.5 (0.3)
Pension and postretirement liability adjustments (1.1) (1.4) (3.8) (3.7)
Other comprehensive income (loss), net of tax (1.2) (1.2) (2.3) (4.0)
Comprehensive Income (Loss), net of tax $ 6.9 $ (7.1) $ 10.8 $ 18.7