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Fair Value Measurement - Financial Liabilities Measured at Fair Value (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Borrowings $ 66.1 $ 0.0
Level III    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period 3,947.2 17,172.0
Deconsolidation of funds   (14,629.3)
Borrowings 431.5 12.7
Paydowns (769.4) (14.8)
Realized and unrealized (gains) losses, net    
Included in earnings 23.4 (48.5)
Included in other comprehensive income 34.1 64.7
Balance, end of period 3,666.8 2,556.8
Changes in unrealized (gains) losses included in earnings related to financial liabilities still held at the reporting date 31.7 (59.6)
Level III | Loans Payable of Consolidated Funds    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period 3,866.3 17,046.7
Deconsolidation of funds   (14,600.3)
Borrowings 431.5 12.7
Paydowns (762.0) (5.1)
Realized and unrealized (gains) losses, net    
Included in earnings 18.1 (59.3)
Included in other comprehensive income 33.6 64.3
Balance, end of period 3,587.5 2,459.0
Changes in unrealized (gains) losses included in earnings related to financial liabilities still held at the reporting date 26.4 (70.5)
Level III | Derivative Instruments of Consolidated Funds    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period   29.1
Deconsolidation of funds   (29.0)
Borrowings   0.0
Paydowns   0.0
Realized and unrealized (gains) losses, net    
Included in earnings   (0.1)
Included in other comprehensive income   0.0
Balance, end of period   0.0
Changes in unrealized (gains) losses included in earnings related to financial liabilities still held at the reporting date   0.0
Level III | Contingent Consideration    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period 1.5 20.8
Deconsolidation of funds   0.0
Borrowings 0.0 0.0
Paydowns 0.0 (0.3)
Realized and unrealized (gains) losses, net    
Included in earnings 0.0 3.8
Included in other comprehensive income 0.0 0.0
Balance, end of period 1.5 24.3
Changes in unrealized (gains) losses included in earnings related to financial liabilities still held at the reporting date 0.0 3.8
Level III | Loans Payable of a consolidated real estate VIE    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period 79.4 75.4
Deconsolidation of funds   0.0
Borrowings 0.0 0.0
Paydowns (7.4) (9.4)
Realized and unrealized (gains) losses, net    
Included in earnings 5.3 7.1
Included in other comprehensive income 0.5 0.4
Balance, end of period 77.8 73.5
Changes in unrealized (gains) losses included in earnings related to financial liabilities still held at the reporting date $ 5.3 $ 7.1