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Share Capital and Employee Compensation Plans - Performance Share Unit Activity (Details) - PSUs
$ in Millions
 12 Months Ended
Dec. 31, 2023
USD ($)
shares
Dec. 31, 2022
USD ($)
shares
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Other equity instruments outstanding. beginning (shares | shares 288,000.0 217,600
Granted (shares) | shares 534,900 150,500
Paid out (shares) | shares (66,000.0) (80,100)
Other equity instruments outstanding, ending (shares) | shares 756,900 288,000.0
Fair value of other equity instruments outstanding, beginning $ 4.8 $ 5.5
Granted, fair value 8.7 2.4
Paid out, fair value 0.0 (0.8)
Change in value, fair value (1.0) (2.3)
Fair value of other equity instruments outstanding, ending $ 12.5 $ 4.8