Consolidated Investment Products (Private Equity) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Private Equity Fund Of Funds [Member]
Schedule of Investments [Line Items]
Weighted Average Remaining Term
Private Equity Funds [Member]
Schedule of Investments [Line Items]
Fair Value		$ 368.2
Unfunded Commitments	$ 59.6	$ 218.1
Weighted Average Remaining Term	7 years 7 months	2 years 9 months