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Condensed Consolidated Statements of Comprehensive (Loss) Income - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Statement of Comprehensive Income [Abstract]        
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest $ 17.0 $ 77.7 $ 38.3 $ 150.7
Other Comprehensive Income (Loss), Net of Tax [Abstract]        
Net changes in pension and other postretirement benefits (0.1) 0.0 (0.3) (0.1)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax 0.1 0.1 (0.2) 0.1
Other Comprehensive Income (Loss), Net of Tax, Total 0.0 0.1 (0.5) 0.0
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest, Total 17.0 77.8 37.8 150.7
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest (4.1) (3.4) (8.1) (3.4)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent, Total $ 12.9 $ 74.4 $ 29.7 $ 147.3