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 |