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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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     $ 653.5  
Other comprehensive income before reclassifications     12.6  
Amounts reclassified from AOCL     1.6  
Total other comprehensive income/(loss) $ 9.7 $ (1.5) 14.2 $ 0.4
Ending Balance 704.0   704.0  
Accumulated Other Comprehensive Loss [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (126.2)  
Ending Balance (112.0)   (112.0)  
Derivative Instruments [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     0.3  
Other comprehensive income before reclassifications     0.0  
Amounts reclassified from AOCL     0.0  
Total other comprehensive income/(loss)     0.0  
Ending Balance 0.3   0.3  
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     1.6  
Total other comprehensive income/(loss)     1.6  
Ending Balance (44.4)   (44.4)  
Foreign Currency Translation Items [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (80.5)  
Other comprehensive income before reclassifications     12.6  
Amounts reclassified from AOCL     0.0  
Total other comprehensive income/(loss)     12.6  
Ending Balance $ (67.9)   $ (67.9)