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Reclassifications out of Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     $ 793.9  
Other comprehensive income before reclassifications     (9.8)  
Amounts reclassified from AOCL     0.4  
Total other comprehensive (loss)/income $ (16.9) $ 9.7 (9.4) $ 14.2
Ending Balance 819.3   819.3  
Accumulated Other Comprehensive Loss [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (38.5)  
Ending Balance (47.9)   (47.9)  
Derivative Instruments [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     1.2  
Other comprehensive income before reclassifications     1.1  
Amounts reclassified from AOCL     0.0  
Total other comprehensive (loss)/income     1.1  
Ending Balance 2.3   2.3  
Defined Benefit Pension Plan Items [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (3.2)  
Other comprehensive income before reclassifications     0.0  
Amounts reclassified from AOCL     0.4  
Total other comprehensive (loss)/income     0.4  
Ending Balance (2.8)   (2.8)  
Foreign Currency Translation Items [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (36.5)  
Other comprehensive income before reclassifications     (10.9)  
Amounts reclassified from AOCL     0.0  
Total other comprehensive (loss)/income     (10.9)  
Ending Balance $ (47.4)   $ (47.4)