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Securities Owned	12 Months Ended
	Dec. 31, 2020
Investments Debt And Equity Securities [Abstract]
Securities Owned	10. Securities Owned Securities owned primarily consist of unencumbered U.S. Treasury bills held for liquidity purposes. Total Securities owned were $58.6 million and $57.5 million as of December 31, 2020 and 2019, respectively. For additional information, see Note 15—“Fair Value of Financial Assets and Liabilities.”

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