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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance $ 793.9    
Other comprehensive income before reclassifications (22.3)    
Amounts reclassified from AOCL 0.8    
Actuarial net gains arising during the year (15.7) $ 39.5 $ 3.7
Net current period other comprehensive income (37.2)    
Ending Balance 825.0 793.9  
Accumulated Other Comprehensive Loss [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (38.5)    
Actuarial net gains arising during the year (15.7) 39.5 $ 3.7
Ending Balance (75.7) (38.5)  
Derivative Instruments [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance 1.2    
Other comprehensive income before reclassifications 0.3    
Amounts reclassified from AOCL 0.0    
Actuarial net gains arising during the year 0.0    
Net current period other comprehensive income 0.3    
Ending Balance 1.5 1.2  
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 0.8    
Actuarial net gains arising during the year (15.7)    
Net current period other comprehensive income (14.9)    
Ending Balance (18.1) (3.2)  
Foreign Currency Translation Items [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (36.5)    
Other comprehensive income before reclassifications (22.6)    
Amounts reclassified from AOCL 0.0    
Actuarial net gains arising during the year 0.0    
Net current period other comprehensive income (22.6)    
Ending Balance $ (59.1) $ (36.5)