Investments of Operating Entities and Consolidated Funds - Securities Lending and Borrowing Transactions (Details) (USD $)	Jun. 30, 2014		Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]
Securities Loaned, Fair Value	$ 2,200,000,000		$ 881,700,000
Securities Borrowed, Fair Value	2,200,000,000		892,800,000
Securities borrowed	2,252,521,000		927,773,000
Securities Borrowed, Amount Offset Against Collateral	0	[1]	0	[1]
Securities Borrowed	2,252,521,000		927,773,000
Securities Borrowed, Not Offset against Collateral	2,252,521,000	[2]	927,773,000	[2]
Securities Borrowed, net	0		0
Securities loaned	2,250,562,000		918,577,000
Securities Loaned, Amount Offset Against Collateral	0	[1]	0	[1]
Securities Loaned	2,250,562,000		918,577,000
Securities Loaned, Not Offset Against Collateral	2,250,562,000	[2]	918,577,000	[2]
Securities Loaned, net	$ 0		$ 0

[1] Includes financial instruments subject to enforceable master netting provisions that are permitted to be offset to the extent an event of default has occurred.

[2] Includes the amount of cash collateral held/posted.