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Share Capital and Employee Compensation Plans - Performance Share Unit Activity (Details) - PSUs
$ in Millions
12 Months Ended
Dec. 31, 2024
USD ($)
shares
Dec. 31, 2023
USD ($)
shares
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Other equity instruments outstanding. beginning (shares) | shares 756,900 288,000.0
Granted (shares) | shares 220,000.0 534,900
Paid out (shares) | shares (79,400) (66,000.0)
Forfeited (shares) | shares (17,400)  
Other equity instruments outstanding, ending (shares) | shares 880,100 756,900
Fair value of other equity instruments outstanding, beginning $ 12.5 $ 4.8
Granted, fair value 4.9 8.7
Paid out, fair value (1.6) 0.0
Forfeited, fair value (0.4)  
Change in value, fair value 2.7 (1.0)
Fair value of other equity instruments outstanding, ending $ 18.1 $ 12.5