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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Equity-based compensation expense:      
Awards $ 9.7 $ 4.6 $ 4.7
Excess tax benefit related to share-based awards 1.9 0.4 0.5
Stock Options      
Equity-based compensation expense:      
Awards 0.0 (0.1) 0.3
Stock Awards      
Equity-based compensation expense:      
Awards 9.7 4.7 4.5
Liability Awards      
Equity-based compensation expense:      
Awards $ 2.7 $ 2.2 $ 15.1