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Consolidated Investment Products (Investments Measured at NAV as a practical expedient) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Investment in master fund [Member]    
Schedule of Investments [Line Items]    
Investment Owned, at Fair Value $ 59.1 $ 57.7
Unfunded Commitments 0.0 0.0
Private Equity Funds [Member]    
Schedule of Investments [Line Items]    
Investment Owned, at Fair Value 70.7 68.6
Unfunded Commitments $ 45.3 $ 41.9
Weighted Average Remaining Term 7 years 1 month 7 years