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Financial Investments - Summary of Financial Investments (Detail) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of financial assets [line items]    
Total $ 988.0 $ 691.7
Current, total 639.7 521.7
Non-current, total 348.3 170.0
Public securities [Member]    
Disclosure of financial assets [line items]    
Total 66.5 66.6
Private securities [member]    
Disclosure of financial assets [line items]    
Total 99.9 146.4
Structured notes [member]    
Disclosure of financial assets [line items]    
Total 133.2 0.0
Investment funds [member]    
Disclosure of financial assets [line items]    
Total 125.2 27.4
Fixed-term deposit [member]    
Disclosure of financial assets [line items]    
Total 468.2 350.5
Other Financial Instruments [member]    
Disclosure of financial assets [line items]    
Total $ 95.0 $ 100.8