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Other Comprehensive (Loss) Earnings - Components of AOCI (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Components of AOCI [Abstract]      
Beginning balance $ (100.5) $ (112.0)  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 0.1 11.5 $ (1.0)
Ending balance (100.4) (100.5) (112.0)
Cash flow hedges      
Components of AOCI [Abstract]      
Beginning balance 1.6 0.5  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (1.3) 1.1  
Ending balance 0.3 1.6 0.5
Employee benefit plans      
Components of AOCI [Abstract]      
Beginning balance (22.1) (18.7)  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 5.0 (3.4)  
Ending balance (17.1) (22.1) (18.7)
Cumulative foreign currency translation adjustments      
Components of AOCI [Abstract]      
Beginning balance (80.0) (93.8)  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (3.6) 13.8  
Ending balance $ (83.6) $ (80.0) $ (93.8)