Investments of Operating Entities and Consolidated Funds - Lehman Claims (Details) (Lehman claims, at fair value, USD $) In Millions, unless otherwise specified	Dec. 31, 2014	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	36.2
Other Investments, initial claim current value	0.7
Enterprise LP
Investment Holdings [Line Items]
Other Investments, initial claim current value	$ 0.5