Investments of Operating Entities and Consolidated Funds - Lehman Claims (Details) - Lehman claims, at fair value - USD ($) $ in Millions	Sep. 30, 2015	Sep. 15, 2008
Investment Holdings [Line Items]
Initial value		$ 1.0
Total Dividend Amount Received	$ 1.0
Total Dividend percent received	100.00%
Enterprise Master
Investment Holdings [Line Items]
Initial value		$ 24.3
Total Dividend Amount Received	$ 37.2