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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, 2019
Dec. 31, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Other comprehensive income before reclassifications, before income tax $ 0.5 $ (1.9)
Amounts reclassified from accumulated other comprehensive loss, before income tax (2.4) 0.7
Amounts deferred to accumulated other comprehensive income (loss), before income tax 72.2  
Income tax (16.7) (0.1)
Net current period other comprehensive income, net of income taxes 53.6 (1.3)
Foreign Currency Translation Adjustments    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning Balance (7.3) (5.9)
Other comprehensive income before reclassifications, before income tax 0.5 (1.4)
Amounts reclassified from accumulated other comprehensive 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
Net current period other comprehensive income, net of income taxes 0.5 (1.4)
Ending Balance (6.8) (7.3)
Pension and Postretirement Liability Adjustments    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning Balance (1.6) (1.7)
Other comprehensive income before reclassifications, before income tax 0.0 (0.5)
Amounts reclassified from accumulated other comprehensive loss, before income tax (2.4) 0.7
Amounts deferred to accumulated other comprehensive income (loss), before income tax 72.2  
Income tax (16.7) (0.1)
Net current period other comprehensive income, net of income taxes 53.1 0.1
Ending Balance 51.5 (1.6)
Total    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning Balance (8.9) (7.6)
Ending Balance $ 44.7 $ (8.9)