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Segment Reporting - Adjustments for Performance Fees, Performance Fee Related Compensation and Investment Income (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Performance fees        
Realized $ 411.8 $ 383.4 $ 852.7 $ 905.1
Unrealized (126.2) (168.7) 658.1 (334.3)
Total performance fees 285.6 214.7 1,510.8 570.8
Performance fee related compensation expense        
Realized 189.4 189.0 401.9 423.0
Unrealized (51.8) (78.1) 309.9 (146.1)
Total performance fee related compensation expense 137.6 110.9 711.8 276.9
Net performance fees        
Realized 222.4 194.4 450.8 482.1
Unrealized (74.4) (90.6) 348.2 (188.2)
Total net performance fees 148.0 103.8 799.0 293.9
Investment income (loss)        
Realized 15.5 40.7 42.0 92.2
Unrealized 21.7 29.8 100.5 34.0
Total investment income 37.2 70.5 142.5 126.2
Adjustments        
Performance fees        
Realized (0.8) (2.5) (6.0) 14.1
Unrealized 0.6 42.8 54.6 28.4
Total performance fees (0.2) 40.3 48.6 42.5
Performance fee related compensation expense        
Realized 4.7 5.6 10.5 6.5
Unrealized (3.9) (3.8) (3.4) (3.1)
Total performance fee related compensation expense 0.8 1.8 7.1 3.4
Net performance fees        
Realized (5.5) (8.1) (16.5) 7.6
Unrealized 4.5 46.6 58.0 31.5
Total net performance fees (1.0) 38.5 41.5 39.1
Investment income (loss)        
Realized (68.9) (29.6) (90.2) (64.3)
Unrealized (3.6) (27.6) (45.8) (26.1)
Total investment income (72.5) (57.2) (136.0) (90.4)
Total Reportable Segments        
Performance fees        
Realized 411.0 380.9 846.7 919.2
Unrealized (125.6) (125.9) 712.7 (305.9)
Total performance fees 285.4 255.0 1,559.4 613.3
Performance fee related compensation expense        
Realized 194.1 194.6 412.4 429.5
Unrealized (55.7) (81.9) 306.5 (149.2)
Total performance fee related compensation expense 138.4 112.7 718.9 280.3
Net performance fees        
Realized 216.9 186.3 434.3 489.7
Unrealized (69.9) (44.0) 406.2 (156.7)
Total net performance fees 147.0 142.3 840.5 333.0
Investment income (loss)        
Realized (53.4) 11.1 (48.2) 27.9
Unrealized 18.1 2.2 54.7 7.9
Total investment income $ (35.3) $ 13.3 $ 6.5 $ 35.8