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Income Taxes - Recognized in OCI (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Income Taxes    
Gain (loss) on changes in the fair value of equity investments at FVTOCI $ 8.4 $ (42.3)
Currency translation adjustment 34.8 (92.0)
Other comprehensive income (loss) 43.2 (134.3)
Gain (loss) on changes in the fair value of equity investments at FVTOCI (1.1) 5.6
Other comprehensive income (loss) (1.1) 5.6
Income tax recovery (expense) in other comprehensive income (loss) (1.1) 5.6
Gain (loss) on changes in the fair value of equity investments at FVTOCI 7.3 (36.7)
Currency translation adjustment 34.8 (92.0)
Other comprehensive income (loss), net of taxes $ 42.1 $ (128.7)