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Related Party Transactions	3 Months Ended
Related Party Transactions	Mar. 31, 2018
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions A prior owner of one of the Company’s Affiliates retained interests in certain of the Affiliate’s private equity investment partnerships. The prior owner’s interests are presented in Other liabilities and were $61.2 million and $57.0 million at December 31, 2017 and March 31, 2018, respectively. The Company and its Affiliates earn asset and performance based fees and incur distribution and other expenses for services provided to Affiliate sponsored investment products. In addition, Affiliate management owners and Company officers may serve as trustees or directors of certain investment vehicles from which an Affiliate earns fees. The Company had liabilities to related parties for contingent payment arrangements in connection with certain business combinations. The net present value of the total amounts payable were $9.4 million and $9.8 million as of December 31, 2017 and March 31, 2018, respectively, and were included in Other liabilities. The Company has related party transactions in association with its Affiliate equity transactions, as more fully described in Notes 12 and 13.