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Other Comprehensive (Loss) Earnings - Componets of AOCI (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Components of AOCI [Abstract]      
Beginning balance $ (100.0)   $ (132.1)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (11.0) $ 32.1 (5.9)
Ending balance (111.0) (100.0)  
Cash flow hedges      
Components of AOCI [Abstract]      
Beginning balance 0.5   (3.2)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (0.9) 3.7  
Ending balance (0.4) 0.5  
Employee benefit plans      
Components of AOCI [Abstract]      
Beginning balance (15.3)   (16.6)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (0.2) 1.3  
Ending balance (15.5) (15.3)  
Cumulative foreign currency translation adjustments      
Components of AOCI [Abstract]      
Beginning balance (85.2)   $ (112.3)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (9.9) 27.1  
Ending balance $ (95.1) $ (85.2)