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Fair Value Measurement - Changes in Financial Assets Using Level III Inputs (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2016
Accounting Standards Update 2015-2 | Investments in CLOs and other      
Realized and unrealized gains (losses), net      
Fair value of investments     $ 123.8
Level III      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance, beginning of period $ 4,046.3 $ 17,517.6  
Deconsolidation of funds   (14,923.9)  
Purchases 3,130.8 2,766.0  
Sales and distributions (1,593.0) (521.6)  
Settlements (1,084.1) (771.1)  
Realized and unrealized gains (losses), net      
Included in earnings 46.5 80.2  
Included in other comprehensive income 393.2 (100.9)  
Balance, end of period 4,939.7 4,046.3  
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date 31.5 65.1  
Fair value of investments 4,046.3 17,517.6  
Level III | Equity securities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance, beginning of period 10.3 575.3  
Deconsolidation of funds   (562.1)  
Purchases 0.1 12.2  
Sales and distributions (27.0) (5.1)  
Settlements 0.0 0.0  
Realized and unrealized gains (losses), net      
Included in earnings 23.5 (9.7)  
Included in other comprehensive income 1.0 (0.3)  
Balance, end of period 7.9 10.3  
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date 6.7 (9.5)  
Fair value of investments 10.3 575.3  
Level III | Bonds      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance, beginning of period 396.4 1,180.9  
Deconsolidation of funds   (890.7)  
Purchases 280.6 268.8  
Sales and distributions (310.9) (152.0)  
Settlements 0.0 0.0  
Realized and unrealized gains (losses), net      
Included in earnings (7.5) 4.3  
Included in other comprehensive income 54.8 (14.9)  
Balance, end of period 413.4 396.4  
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date (5.0) 2.8  
Fair value of investments 396.4 1,180.9  
Level III | Loans      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance, beginning of period 3,485.6 15,686.7  
Deconsolidation of funds   (13,506.9)  
Purchases 2,594.3 2,446.7  
Sales and distributions (1,223.9) (356.7)  
Settlements (1,084.1) (771.1)  
Realized and unrealized gains (losses), net      
Included in earnings 16.6 52.7  
Included in other comprehensive income 324.2 (65.8)  
Balance, end of period 4,112.7 3,485.6  
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date 18.5 41.2  
Fair value of investments 3,485.6 15,686.7  
Level III | Partnership and LLC interests      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance, beginning of period 0.0 59.6  
Deconsolidation of funds   (74.3)  
Purchases   12.4  
Sales and distributions   0.0  
Settlements   0.0  
Realized and unrealized gains (losses), net      
Included in earnings   2.3  
Included in other comprehensive income   0.0  
Balance, end of period   0.0  
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date   0.0  
Fair value of investments 0.0 59.6  
Level III | Other      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance, beginning of period 1.4 5.0  
Deconsolidation of funds   (5.0)  
Purchases 0.0 0.0  
Sales and distributions (3.0) 0.0  
Settlements 0.0 0.0  
Realized and unrealized gains (losses), net      
Included in earnings 1.7 1.5  
Included in other comprehensive income 0.2 (0.1)  
Balance, end of period 0.3 1.4  
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date 0.0 1.5  
Fair value of investments 1.4 5.0  
Level III | Investments in CLOs and other      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance, beginning of period 152.6 1.4  
Deconsolidation of funds   123.8  
Purchases 255.8 25.9  
Sales and distributions (28.2) (7.8)  
Settlements 0.0 0.0  
Realized and unrealized gains (losses), net      
Included in earnings 12.2 29.1  
Included in other comprehensive income 13.0 (19.8)  
Balance, end of period 405.4 152.6  
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date 11.3 29.1  
Fair value of investments 152.6 1.4  
Level III | Restricted securities of Consolidated Funds      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance, beginning of period 0.0 8.7  
Deconsolidation of funds   (8.7)  
Purchases   0.0  
Sales and distributions   0.0  
Settlements   0.0  
Realized and unrealized gains (losses), net      
Included in earnings   0.0  
Included in other comprehensive income   0.0  
Balance, end of period   0.0  
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date   0.0  
Fair value of investments $ 0.0 $ 8.7