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Revenues - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018
Revenue from Contract with Customer [Abstract] |  |
Subadvisory fees for mutual funds | $ 11.4 | $ 36.6

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- References No definition available. + Details
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- Definition Subadvisory fees that the funds adviser pays for out of the management fee, which it receives from the fund. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.14) -URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260 + Details
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