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Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance $ 1,256.5  
Other comprehensive loss (4.2) $ (14.9)
Ending balance 1,252.6 1,256.5
Unrealized Translation    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (27.7)  
Other comprehensive loss (4.2)  
Ending balance (31.9)  
Cash Flow Hedges    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance 0.0  
Other comprehensive loss 0.0  
Ending balance 0.0  
Defined Benefit Pension Plans    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (0.4)  
Other comprehensive loss 0.0  
Ending balance (0.4)  
Accumulated Other Comprehensive Loss    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (28.1) (32.0)
Other comprehensive loss (4.2)  
Ending balance $ (32.3) $ (46.9)