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Segment Reporting - Adjustments for Performance Fees, Performance Fee Related Compensation and Investment Income (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Performance fees    
Realized $ 83.2 $ 131.8
Unrealized 598.4 13.4
Total performance fees 681.6 145.2
Performance fee related compensation expense    
Realized 45.8 61.6
Unrealized 271.3 7.9
Total performance fee related compensation expense 317.1 69.5
Net performance fees    
Realized 37.4 70.2
Unrealized 327.1 5.5
Total net performance fees 364.5 75.7
Investment income (loss)    
Realized (0.2) 12.6
Unrealized 46.5 (22.2)
Total investment income (loss) 46.3 (9.6)
Adjustments    
Performance fees    
Realized (0.2) 0.2
Unrealized 33.3 2.6
Total performance fees 33.1 2.8
Performance fee related compensation expense    
Realized 1.9 0.3
Unrealized 1.6 2.9
Total performance fee related compensation expense 3.5 3.2
Net performance fees    
Realized (2.1) (0.1)
Unrealized 31.7 (0.3)
Total net performance fees 29.6 (0.4)
Investment income (loss)    
Realized (5.2) (5.1)
Unrealized (30.5) 8.3
Total investment income (loss) (35.7) 3.2
Total Reportable Segments    
Performance fees    
Realized 83.0 132.0
Unrealized 631.7 16.0
Total performance fees 714.7 148.0
Performance fee related compensation expense    
Realized 47.7 61.9
Unrealized 272.9 10.8
Total performance fee related compensation expense 320.6 72.7
Net performance fees    
Realized 35.3 70.1
Unrealized 358.8 5.2
Total net performance fees 394.1 75.3
Investment income (loss)    
Realized (5.4) 7.5
Unrealized 16.0 (13.9)
Total investment income (loss) $ 10.6 $ (6.4)