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Accumulated Other Comprehensive Income (Loss) - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance $ 563.1 $ 612.9 $ 616.7
Other comprehensive income before reclassifications, before income tax 1.4 0.5  
Amounts reclassified from accumulated other comprehensive income (loss), before income tax (5.6) (2.4)  
Amounts deferred to accumulated other comprehensive income (loss), before income tax   72.2  
Income tax (0.1) (16.7) (0.1)
Other comprehensive income (loss), net of tax (4.3) 53.6 (1.3)
Ending balance 507.5 563.1 612.9
Foreign Currency Translation Adjustments      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (6.8) (7.3)  
Other comprehensive income before reclassifications, before income tax 1.4 0.5  
Amounts reclassified from accumulated other comprehensive income (loss), before income tax 0.0 0.0  
Amounts deferred to accumulated other comprehensive income (loss), before income tax   0.0  
Income tax 0.0 0.0  
Other comprehensive income (loss), net of tax 1.4 0.5  
Ending balance (5.4) (6.8) (7.3)
Pension and Postretirement Liability Adjustments      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 51.5 (1.6)  
Other comprehensive income before reclassifications, before income tax 0.0 0.0  
Amounts reclassified from accumulated other comprehensive income (loss), before income tax (5.6) (2.4)  
Amounts deferred to accumulated other comprehensive income (loss), before income tax   72.2  
Income tax (0.1) (16.7)  
Other comprehensive income (loss), net of tax (5.7) 53.1  
Ending balance 45.8 51.5 (1.6)
Accumulated Other Comprehensive Income (Loss)      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 44.7 (8.9) (7.6)
Other comprehensive income (loss), net of tax (4.3) 53.6 (1.3)
Ending balance $ 40.4 $ 44.7 $ (8.9)