Investments of Operating Entities and Consolidated Funds - Securities Lending and Borrowing Transactions (Details) (USD $)	Dec. 31, 2013		Dec. 31, 2012
Investments, Debt and Equity Securities [Abstract]
Securities Loaned, Fair Value	$ 881,700,000		$ 388,400,000
Securities Borrowed, Fair Value	892,800,000		391,600,000
Securities borrowed	927,773,000		406,326,000
Securities Borrowed, Amount Offset Against Collateral	0	[1]	0	[1]
Securities Borrowed	927,773,000		406,326,000
Securities Borrowed, Not Offset against Collateral	927,773,000	[2]	406,326,000	[2]
Securities Borrowed, net	0		0
Securities loaned	918,577,000		408,972,000
Securities Loaned, Amount Offset Against Collateral	0	[1]	0	[1]
Securities Loaned	918,577,000		408,972,000
Securities Loaned, Not Offset Against Collateral	918,577,000	[2]	408,972,000	[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.