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Financial Instruments - Financial Assets Recorded at FVTOCI (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of financial assets [line items]    
Gains (losses) on financial assets at fair value through profit or loss $ 8.3 $ 7.3
Income tax expense related to investments 0.5 (0.5)
Equity securities | FVTOCI | Investments    
Disclosure of financial assets [line items]    
Unrealized losses on investments (5.4) (3.5)
Realized gains on investments (18.8) 0.0
Gains (losses) on financial assets at fair value through profit or loss (24.2) $ (3.5)
Income tax expense related to investments $ 0.5