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Revenue Recognition Revenue Recognition (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Additional Information [Abstract]
Management Fees, Incentive Revenue (Deprecated 2018-01-31)	$ 0.3
Brokerage Commissions Revenue	$ 0.7	$ 0.4

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- Definition

Additional Information [Abstract]

+ References

No definition available.

+ Details

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X

- Definition

Incentive Revenue

+ References

No definition available.

+ Details

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- Definition

Amount of commission revenue from buying and selling securities on behalf of customers.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 940
-SubTopic 20
-Section 05
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=68070981&loc=d3e40544-110947

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.13(a),(b))
-URI http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260

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