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Commission Management Payable	6 Months Ended
Commission Management Payable	Jun. 30, 2019
Commission Management Payable [Abstract]
Commission Management Payable	Commission Management Payable The Company receives a gross commission from various clearing 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 $96.7 million and $95.3 million, as of June 30, 2019 and December 31, 2018, respectively, are classified as commission management payable in the accompanying condensed consolidated statements of financial condition.