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Reclassifications out of Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     $ 653.5  
Other comprehensive income before reclassifications     30.9  
Amounts reclassified from AOCL     2.5  
Total other comprehensive income $ 19.2 $ 0.2 33.4 $ 0.6
Ending Balance 747.5   747.5  
Accumulated Other Comprehensive Loss [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (126.2)  
Ending Balance (92.8)   (92.8)  
Derivative Instruments [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     0.3  
Other comprehensive income before reclassifications     0.2  
Amounts reclassified from AOCL     0.0  
Total other comprehensive income     0.2  
Ending Balance 0.5   0.5  
Defined Benefit Pension Plan Items [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (46.0)  
Other comprehensive income before reclassifications     0.0  
Amounts reclassified from AOCL     2.5  
Total other comprehensive income     2.5  
Ending Balance (43.5)   (43.5)  
Foreign Currency Translation Items [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (80.5)  
Other comprehensive income before reclassifications     30.7  
Amounts reclassified from AOCL     0.0  
Total other comprehensive income     30.7  
Ending Balance $ (49.8)   $ (49.8)