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Reclassifications out of Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance $ 653.5    
Other comprehensive income before reclassifications 44.9    
Amounts reclassified from AOCL 3.3    
Actuarial net gains arising during the year 39.5 $ 3.7 $ 3.2
Net current period other comprehensive income 87.7    
Ending Balance 793.9 653.5  
Accumulated Other Comprehensive Loss [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (126.2)    
Actuarial net gains arising during the year 39.5 3.7 $ 3.2
Ending Balance (38.5) (126.2)  
Derivative Instruments [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance 0.3    
Other comprehensive income before reclassifications 0.9    
Amounts reclassified from AOCL 0.0    
Actuarial net gains arising during the year 0.0    
Net current period other comprehensive income 0.9    
Ending Balance 1.2 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 3.3    
Actuarial net gains arising during the year 39.5    
Net current period other comprehensive income 42.8    
Ending Balance (3.2) (46.0)  
Foreign Currency Translation Items [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (80.5)    
Other comprehensive income before reclassifications 44.0    
Amounts reclassified from AOCL 0.0    
Actuarial net gains arising during the year 0.0    
Net current period other comprehensive income 44.0    
Ending Balance $ (36.5) $ (80.5)