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Consolidated Sponsored Investment Products - Schedule of Investments in Fund Products for which Fair Value was Estimated using NAV as a Practical Expedient (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Sep. 30, 2016
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments in funds products for which fair value was estimated using NAV $ 155.2 $ 446.0
Real Estate and Private Equity Funds [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments in funds products for which fair value was estimated using NAV 155.2 444.2
Hedge Funds [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments in funds products for which fair value was estimated using NAV $ 0.0 $ 1.8