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Consolidated Investment Entities (Fair Value Measurement) (Details) (USD $)
 3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Variable Interest Entity [Line Items]    
Revolving lines of credit $ 9,977,900,000  
Outstanding borrowings 5,599,900,000  
Transfers in to Level 3 13,900,000  
VOEs | Private Equity Funds
    
Variable Interest Entity [Line Items]    
Revolving lines of credit 400,000,000 400,000,000
Asset coverage, percentage 350.00%  
Outstanding borrowings 212,200,000 212,200,000
VOEs | Securities Sold under Agreements to Repurchase
    
Variable Interest Entity [Line Items]    
Outstanding borrowings 176,000,000 147,500,000
VOEs | LIBOR | Private Equity Funds
    
Variable Interest Entity [Line Items]    
Description of variable rate basis LIBOR  
Basis spread 2.35%  
VOEs | EURIBOR | Private Equity Funds
    
Variable Interest Entity [Line Items]    
Description of variable rate basis EURIBOR  
Basis spread 2.50%  
VIEs | Corporate Loans | Senior Secured Corporate Loans
    
Variable Interest Entity [Line Items]    
Unpaid principal exceeds fair value, amount 8,700,000 9,700,000
Default of collateral assets, percentage 1.00% 1.00%
VIEs | Corporate Loans | Senior Secured Corporate Loans | LIBOR or Prime | Maximum
    
Variable Interest Entity [Line Items]    
Basis spread 9.80%  
VIEs | Corporate Loans | Senior Secured Corporate Loans | LIBOR
    
Variable Interest Entity [Line Items]    
Description of variable rate basis LIBOR  
VIEs | Corporate Loans | Senior Secured Corporate Loans | PRIME
    
Variable Interest Entity [Line Items]    
Description of variable rate basis PRIME  
VIEs | Collateralized Debt Obligations | Senior Secured Floating Rate Leveraged Loans
    
Variable Interest Entity [Line Items]    
Unpaid principal exceeds fair value, amount $ 141,000,000 $ 139,600,000
Weighted average maturity 9 years 1 month 6 days  
VIEs | Collateralized Debt Obligations | Senior Secured Floating Rate Leveraged Loans | LIBOR
    
Variable Interest Entity [Line Items]    
Description of variable rate basis LIBOR  
VIEs | Collateralized Debt Obligations | Senior Secured Floating Rate Leveraged Loans | LIBOR | Minimum
    
Variable Interest Entity [Line Items]    
Basis spread 0.22%  
VIEs | Collateralized Debt Obligations | Senior Secured Floating Rate Leveraged Loans | LIBOR | Maximum
    
Variable Interest Entity [Line Items]    
Basis spread 7.00%