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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance $ 918.5    
Other comprehensive income before reclassifications 23.7    
Amounts reclassified from AOCL 1.1    
Actuarial net gains arising during the year (7.7) $ 9.5 $ (15.7)
Total other comprehensive income/(loss) 17.1    
Ending Balance 944.4 918.5  
Accumulated Other Comprehensive Loss [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (74.4)    
Actuarial net gains arising during the year (7.7) 9.5 $ (15.7)
Ending Balance (57.3) (74.4)  
Defined Benefit Pension Plan Items [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (9.3)    
Other comprehensive income before reclassifications 0.0    
Amounts reclassified from AOCL 1.1    
Actuarial net gains arising during the year (7.7)    
Total other comprehensive income/(loss) (6.6)    
Ending Balance (15.9) (9.3)  
Foreign Currency Translation Items [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (65.1)    
Other comprehensive income before reclassifications 23.7    
Amounts reclassified from AOCL (0.0)    
Actuarial net gains arising during the year 0.0    
Total other comprehensive income/(loss) 23.7    
Ending Balance $ (41.4) $ (65.1)