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Reclassifications out of Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance $ 825.0  
Other comprehensive income before reclassifications (5.5)  
Amounts reclassified from AOCL (0.2)  
Total other comprehensive [(loss)/income] (5.7) $ 7.5
Ending Balance 848.4  
Accumulated Other Comprehensive Loss [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (75.7)  
Ending Balance (81.4)  
Derivative Instruments [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance 1.5  
Other comprehensive income before reclassifications (0.5)  
Amounts reclassified from AOCL 0.0  
Total other comprehensive [(loss)/income] (0.5)  
Ending Balance 1.0  
Defined Benefit Pension Plan Items [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (18.1)  
Other comprehensive income before reclassifications 0.0  
Amounts reclassified from AOCL (0.2)  
Total other comprehensive [(loss)/income] (0.2)  
Ending Balance (18.3)  
Foreign Currency Translation Items [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (59.1)  
Other comprehensive income before reclassifications (5.0)  
Amounts reclassified from AOCL 0.0  
Total other comprehensive [(loss)/income] (5.0)  
Ending Balance $ (64.1)