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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance $ 944.4    
Other comprehensive income before reclassifications (20.2) $ 23.7  
Amounts reclassified from AOCL 2.4 1.1  
Actuarial net gains arising during the year 28.2 (7.7) $ 9.5
Total other comprehensive income/(loss) 10.4 17.1  
Ending Balance 1,032.4 944.4  
Accumulated Other Comprehensive Loss [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (57.3) (74.4)  
Actuarial net gains arising during the year 28.2 (7.7) 9.5
Ending Balance (46.9) (57.3) (74.4)
Defined Benefit Pension Plan Items [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (19.9) (13.3)  
Other comprehensive income before reclassifications 0.0  
Amounts reclassified from AOCL 2.4 1.1  
Actuarial net gains arising during the year 28.2 (7.7)  
Total other comprehensive income/(loss) 30.6 (6.6)  
Ending Balance 10.7 (19.9) (13.3)
Foreign Currency Translation Items [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (37.4) (61.1)  
Other comprehensive income before reclassifications (20.2) 23.7  
Amounts reclassified from AOCL 0.0  
Actuarial net gains arising during the year 0.0  
Total other comprehensive income/(loss) (20.2) 23.7  
Ending Balance $ (57.6) $ (37.4) $ (61.1)