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Consolidated Investment Products (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Variable Interest Entity [Line Items]    
Percentage of VIE general partnership interest 1.00%  
Number of Investment Trusts Entered into Contingent Support Agreements 2  
Total assets $ 17,492,400,000 $ 19,347,000,000
Pay interest at Libor or Euribor plus 12.50%  
Collateral assets, default percentage 1.80% 1.00%
Outstanding balance on the notes issued by consolidated CLOs exceeds their fair value by approximately 300,000,000 1,000,000,000
Notes issued by collateralized loan obligations terms of arrangements interest rate margin spread low 0.21%  
Notes issued by collateralized loan obligations terms of arrangements interest rate margin spread high 7.10%  
Notes issued by collateralized loan obligations cumulative average default rate range minimum 1.00%  
Notes issued by collateralized loan obligations cumulative average default rate range maximum 5.00%  
CLO [Member]
   
Variable Interest Entity [Line Items]    
Weighted average maturity (years) 8.8  
Gain (loss) on derivative instruments, net, pretax 9,600,000 9,200,000
Senior Secured Bank Loans And Bonds [Member] | CLO [Member]
   
Variable Interest Entity [Line Items]    
Fair value, option, aggregate differences, long-term debt instruments 121,600,000 701,000,000
Swap [Member] | VIEs [Member]
   
Variable Interest Entity [Line Items]    
Derivative instruments, number of open swap agreements 0 70
Derivative instruments, open swap agreements, notional value   123,300,000
Minimum [Member] | Private Equity Funds [Member]
   
Variable Interest Entity [Line Items]    
Variable Interest Entity Terms (in years) 7 years  
Maximum [Member] | Private Equity Funds [Member]
   
Variable Interest Entity [Line Items]    
Variable Interest Entity Terms (in years) 12 years  
Level 3 Assets [Member]
   
Variable Interest Entity [Line Items]    
Transfers, net $ (9,900,000)