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Financial Instruments - Financial Assets Recorded at FVTOCI (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of financial assets [line items]    
Gains (losses) on financial assets at fair value through profit or loss $ (25.1) $ 8.3
Income tax expense related to investments 0.0 0.5
Equity securities | FVTOCI | Investments    
Disclosure of financial assets [line items]    
Unrealized losses on investments (0.5) (5.4)
Realized gains on investments 0.1 (18.8)
Gains (losses) on financial assets at fair value through profit or loss $ (0.4) $ (24.2)