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Share Capital and Employee Compensation Plans - Deferred Stock Unit Activity (Details) - DSUs
$ 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 109,000.0 0
Granted (shares) | shares 47,500 109,000.0
Paid out (shares) | shares (25,700)  
Other equity instruments outstanding, ending (shares) | shares 130,800 109,000.0
Fair value of other equity instruments outstanding, beginning $ 1.8 $ 0.0
Granted, fair value 1.0 1.7
Paid out, fair value (0.6)  
Change in value, fair value 0.6 0.1
Fair value of other equity instruments outstanding, ending $ 2.8 $ 1.8