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Share Capital and Employee Compensation Plans - Restricted Stock Unit Activity (Details) - RSUs
$ 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 805,000.0 551,800
Granted (shares) | shares 636,700 516,200
Paid out (shares) | shares (299,500) (237,300)
Forfeited (shares) | shares (124,500) (25,700)
Other equity instruments outstanding, ending (shares) | shares 1,017,700 805,000.0
Fair value of other equity instruments outstanding, beginning $ 13.1 $ 9.1
Granted, fair value 14.9 8.4
Paid out, fair value (6.1) (3.9)
Forfeited, fair value (2.5) (0.4)
Change in value, fair value 1.5 (0.1)
Fair value of other equity instruments outstanding, ending $ 20.9 $ 13.1