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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, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Opening balance     $ (110.9)  
Other comprehensive income before reclassifications     (0.2)  
Amounts reclassified from AOCL     0.6  
Total other comprehensive income $ (1.5) $ 4.0 0.4 $ (3.2)
Closing balance (110.5)   (110.5)  
Defined Benefit Pension Plan Items [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Opening balance     (50.9)  
Other comprehensive income before reclassifications     0.0  
Amounts reclassified from AOCL     0.6  
Total other comprehensive income     0.6  
Closing balance (50.3)   (50.3)  
Foreign Currency Translation Items [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Opening balance     (60.0)  
Other comprehensive income before reclassifications     (0.2)  
Amounts reclassified from AOCL     0.0  
Total other comprehensive income     (0.2)  
Closing balance $ (60.2)   $ (60.2)