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Stockholders' Equity - Change in Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance $ (91.7)    
Net current-period other comprehensive income (loss) 17.5 $ (2.6) $ 8.2
Ending balance (74.2) (91.7)  
Reclassification out of Accumulated Other Comprehensive Income      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement 10.3    
Actuarial Losses (b)      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance (88.2) (80.4)  
Other comprehensive income (loss) before reclassifications 9.1 (10.6)  
Amounts reclassified from accumulated other comprehensive loss 11.2 2.8  
Net current-period other comprehensive income (loss) 20.3 (7.8)  
Ending balance (67.9) (88.2) (80.4)
Prior Service Costs      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance (2.6) (2.4)  
Other comprehensive income (loss) before reclassifications 0.0 (0.3)  
Amounts reclassified from accumulated other comprehensive loss 0.2 0.1  
Net current-period other comprehensive income (loss) 0.2 (0.2)  
Ending balance (2.4) (2.6) (2.4)
Foreign Currency Translation      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance 1.3 (7.1)  
Other comprehensive income (loss) before reclassifications (4.7) 8.4  
Amounts reclassified from accumulated other comprehensive loss 0.0 0.0  
Net current-period other comprehensive income (loss) (4.7) 8.4  
Ending balance (3.4) 1.3 (7.1)
Interest Rate Swaps      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance (2.2) 0.8  
Other comprehensive income (loss) before reclassifications 1.0 (3.3)  
Amounts reclassified from accumulated other comprehensive loss 0.7 0.3  
Net current-period other comprehensive income (loss) 1.7 (3.0)  
Ending balance (0.5) (2.2) 0.8
Accumulated Other Comprehensive Loss      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance (91.7) (89.1)  
Other comprehensive income (loss) before reclassifications 5.4 (5.8)  
Amounts reclassified from accumulated other comprehensive loss 12.1 3.2  
Net current-period other comprehensive income (loss) 17.5 (2.6) 8.2
Ending balance $ (74.2) $ (91.7) $ (89.1)