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Stockholders' Equity - Changes in Each Component of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance $ (97.3)  
Net current-period other comprehensive income (loss) (0.3) $ 2.9
Ending balance (97.6)  
Actuarial Losses    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance [1] (87.4) (75.4)
Other comprehensive loss before reclassifications [1] (0.4) (0.7)
Amounts reclassified from accumulated other comprehensive loss [1] 0.6 0.8
Net current-period other comprehensive income (loss) [1] 0.2 0.1
Ending balance [1] (87.2) (75.3)
Prior Service Costs    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance [1] (2.5)  
Other comprehensive loss before reclassifications [1] 0.0  
Amounts reclassified from accumulated other comprehensive loss [1] 0.0  
Net current-period other comprehensive income (loss) [1] 0.0  
Ending balance [1] (2.5)  
Foreign Currency Translation    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance [1] (8.9) (2.5)
Other comprehensive loss before reclassifications [1] 0.0 2.0
Amounts reclassified from accumulated other comprehensive loss [1] 0.0 0.0
Net current-period other comprehensive income (loss) [1] 0.0 2.0
Ending balance [1] (8.9) (0.5)
Unrealized Gain on Derivatives    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance [1] 1.5 1.0
Other comprehensive loss before reclassifications [1] (0.2) 0.8
Amounts reclassified from accumulated other comprehensive loss [1] (0.3) 0.0
Net current-period other comprehensive income (loss) [1] (0.5) 0.8
Ending balance [1] 1.0 1.8
Accumulated Other Comprehensive Loss    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance [1] (97.3) (76.9)
Other comprehensive loss before reclassifications [1] (0.6) 2.1
Amounts reclassified from accumulated other comprehensive loss [1] 0.3 0.8
Net current-period other comprehensive income (loss) [1] (0.3) 2.9
Ending balance [1] $ (97.6) $ (74.0)
[1] Amounts in parentheses indicate losses.