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Securities Owned	3 Months Ended
	Mar. 31, 2019
Investments Debt And Equity Securities [Abstract]
Securities Owned	7. Securities Owned Securities owned primarily consist of unencumbered U.S. Treasury bills held for liquidity purposes. Total Securities owned were $60.1 million as of March 31, 2019 and $58.4 million as of December 31, 2018. For additional information, see Note 12—“Fair Value of Financial Assets and Liabilities.”

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