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Share Capital and Employee Compensation Plans - Restricted Stock Unit Activity (Details) - RSUs
$ 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 551,800 426,400
Granted (shares) | shares 516,200 341,100
Paid out (shares) | shares (237,300) (198,400)
Forfeited (shares) | shares (25,700) (17,300)
Other equity instruments outstanding, ending (shares) | shares 805,000.0 551,800
Fair value of other equity instruments outstanding, beginning $ 9.1 $ 10.7
Granted, fair value 8.4 5.6
Paid out, fair value (3.9) (3.4)
Forfeited, fair value (0.4) (0.3)
Change in value, fair value (0.1) (3.5)
Fair value of other equity instruments outstanding, ending $ 13.1 $ 9.1