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Other Intangible Assets - Summary of Other Intangible Assets (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Gross cost at January 1 $ 331.8    
Additions 7.2    
Exchange effect 5.7    
Gross cost at March 31 344.7    
Accumulated amortization at January 1 (266.4)    
Amortization expense (2.7) $ (2.8)  
Exchange effect (2.8)    
Accumulated amortization at March 31 (271.9)    
Net book amount at March 31 $ 72.8   $ 65.4