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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance $ 1,032.4    
Other comprehensive income/(losses) before reclassifications (29.2) $ (20.2)  
Amounts reclassified from AOCL 0.8 2.4  
Actuarial net gains/(losses) arising during the year (69.9) 28.2 $ (7.7)
Net current period other comprehensive income/(losses) (98.3) 10.4  
Ending Balance 1,038.0 1,032.4  
Accumulated Other Comprehensive Loss [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (46.9) (57.3)  
Actuarial net gains/(losses) arising during the year (69.9) 28.2 (7.7)
Ending Balance (145.2) (46.9) (57.3)
Defined Benefit Pension Plan Items [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance 10.7 (19.9)  
Other comprehensive income/(losses) before reclassifications    
Amounts reclassified from AOCL 0.8 2.4  
Actuarial net gains/(losses) arising during the year (69.9) 28.2  
Net current period other comprehensive income/(losses) (69.1) 30.6  
Ending Balance (58.4) 10.7 (19.9)
Foreign Currency Translation Items [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (57.6) (37.4)  
Other comprehensive income/(losses) before reclassifications (29.2) (20.2)  
Amounts reclassified from AOCL    
Actuarial net gains/(losses) arising during the year    
Net current period other comprehensive income/(losses) (29.2) (20.2)  
Ending Balance $ (86.8) $ (57.6) $ (37.4)