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Fair Value Measurement - Transfer Out of Level lll of Financial Liabilities (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance, beginning of period $ 10,121.6 $ 11,009.4
Initial consolidation of funds 2,220.4 453.0
Contingent consideration from acquisitions 54.0 75.9
Transfers out (37.8)  
Issuances   (11.3)
Borrowings 2,217.7 510.4
Paydowns (1,701.2) (1,965.5)
Sales (0.2) (3.2)
Realized and unrealized (gains) losses, net 984.7 52.9
Balance, end of period 13,859.2 10,121.6
Changes in unrealized (gains) losses included in earnings related to financial liabilities still held at the reporting date 834.4 (25.9)
Loans Payable of Consolidated Funds [Member]
   
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance, beginning of period 9,689.9 10,418.5
Initial consolidation of funds 2,215.8 453.0
Borrowings 2,217.7 510.4
Paydowns (1,429.7) (1,699.0)
Realized and unrealized (gains) losses, net 963.0 7.0
Balance, end of period 13,656.7 9,689.9
Changes in unrealized (gains) losses included in earnings related to financial liabilities still held at the reporting date 792.4 (44.9)
Derivative Instruments of Consolidated Funds [Member]
   
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance, beginning of period   1.9
Initial consolidation of funds 4.6  
Paydowns   (0.1)
Sales (0.2) (3.2)
Realized and unrealized (gains) losses, net 11.4 1.4
Balance, end of period 15.8  
Changes in unrealized (gains) losses included in earnings related to financial liabilities still held at the reporting date 34.9  
Subordinated Loan Payable to Affiliate [Member]
   
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance, beginning of period 262.5 494.0
Paydowns (260.0) (260.0)
Realized and unrealized (gains) losses, net (2.5) 28.5
Balance, end of period   262.5
Changes in unrealized (gains) losses included in earnings related to financial liabilities still held at the reporting date   15.5
Contingent Consideration [Member]
   
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance, beginning of period 169.2 95.0
Contingent consideration from acquisitions 54.0 75.9
Transfers out (37.8)  
Issuances   (11.3)
Paydowns (11.5) (6.4)
Realized and unrealized (gains) losses, net 12.8 16.0
Balance, end of period 186.7 169.2
Changes in unrealized (gains) losses included in earnings related to financial liabilities still held at the reporting date $ 7.1 $ 3.5