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Employee Compensation and Benefit Plans - Schedule of Equity-based Compensation Expense Related to Stock Options and Stock Awards and Related Excess Tax Benefit (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Equity-based compensation expense:      
Awards $ 4.6 $ 4.7 $ 2.4
Excess tax benefit (tax deficiency) related to share-based awards 0.4 0.5 (0.4)
Stock Options      
Equity-based compensation expense:      
Awards (0.1) 0.3 (0.4)
Stock Awards      
Equity-based compensation expense:      
Awards 4.7 4.5 2.8
Liability Awards      
Equity-based compensation expense:      
Awards $ 2.2 $ 15.1 $ 5.6