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Consolidated Investment Products (Fair Value Hierarchy Levels Of Investments Held And Notes Issued By Consolidated Investment Products) (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Real Estate Investments, Net $ 54.8 $ 40.7
Investment in master fund 59.1 57.7
Investments Of Consolidated Investment Products 4,890.5 5,116.1
Fair Value, Inputs, Level 1 [Member]    
Real Estate Investments, Net 0.0 0.0
Investment in master fund 0.0 0.0
Investments Of Consolidated Investment Products 187.1 179.0
Significant Other Observable Inputs (Level 2) [Member]    
Real Estate Investments, Net 0.0 0.0
Investment in master fund 0.0 0.0
Investments Of Consolidated Investment Products 4,518.8 4,770.1
Significant Unobservable Inputs (Level 3) [Member]    
Real Estate Investments, Net 54.8 40.7
Investment in master fund 0.0 0.0
Investments Of Consolidated Investment Products 54.8 40.7
Bank Loans [Member]    
CLO Collateral Assets 4,286.7 4,397.8
Bank Loans [Member] | Fair Value, Inputs, Level 1 [Member]    
CLO Collateral Assets 0.0 0.0
Bank Loans [Member] | Significant Other Observable Inputs (Level 2) [Member]    
CLO Collateral Assets 4,286.7 4,397.8
Bank Loans [Member] | Significant Unobservable Inputs (Level 3) [Member]    
CLO Collateral Assets 0.0 0.0
Bonds [Member]    
CLO Collateral Assets 244.7 370.9
Bonds [Member] | Fair Value, Inputs, Level 1 [Member]    
CLO Collateral Assets 14.3 0.0
Bonds [Member] | Significant Other Observable Inputs (Level 2) [Member]    
CLO Collateral Assets 230.4 370.9
Bonds [Member] | Significant Unobservable Inputs (Level 3) [Member]    
CLO Collateral Assets 0.0 0.0
Equity Securities [Member]    
CLO Collateral Assets 159.3 167.4
Private Equity Fund Assets 15.2 13.0
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
CLO Collateral Assets 157.6 166.0
Private Equity Fund Assets 15.2 13.0
Equity Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]    
CLO Collateral Assets 1.7 1.4
Private Equity Fund Assets 0.0 0.0
Equity Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]    
CLO Collateral Assets 0.0 0.0
Private Equity Fund Assets 0.0 0.0
Private Equity Funds [Member]    
Private Equity Fund Assets 70.7 68.6
Private Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member]    
Private Equity Fund Assets 0.0 0.0
Private Equity Funds [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Private Equity Fund Assets 0.0 0.0
Private Equity Funds [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Private Equity Fund Assets 0.0
Investments Measured at NAV [Member]    
Real Estate Investments, Net 0.0 0.0
Investment in master fund 59.1 57.7
Investments Of Consolidated Investment Products 129.8 126.3
Investments Measured at NAV [Member] | Bank Loans [Member]    
CLO Collateral Assets 0.0 0.0
Investments Measured at NAV [Member] | Bonds [Member]    
CLO Collateral Assets 0.0 0.0
Investments Measured at NAV [Member] | Equity Securities [Member]    
CLO Collateral Assets 0.0 0.0
Private Equity Fund Assets 0.0 0.0
Investments Measured at NAV [Member] | Private Equity Funds [Member]    
Private Equity Fund Assets $ 70.7 $ 68.6