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Employee Compensation and Benefit Plans - Schedule of Liability Award Activity (Details) - Long-Term Incentive (LTI) Program - shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Unvested at beginning of year (in shares) 243,441 0
Granted (in shares) 601,787 251,076
Vested (in shares) (21,909) 0
Forfeited/Cancelled (in shares) (94,954) (7,635)
Conversion of fractional stock units on reverse stock split 8 0
Unvested at end of year (in shares) 728,373 243,441