Commission Management Payable	12 Months Ended
	Dec. 31, 2021
Commission Management Payable [Abstract]
Commission Management Payable	Commission Management PayableThe Company receives a gross commission from various brokers, which is then used to fund commission sharing and recapture arrangements, less the portion retained as income to the Company. Accrued commission sharing and commission recapture payable of $103.0 million and $117.0 million, as of December 31, 2021 and 2020, respectively, are classified as commission management payable in the accompanying consolidated statements of financial condition.