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Equity Method Investments in Affiliates - Additional Information (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Schedule of Equity Method Investments [Line Items]        
Amortization expense during the period $ 21.2 $ 26.9 $ 65.1 $ 82.2
Acquired Client Relationships        
Schedule of Equity Method Investments [Line Items]        
Weighted average client-acquired relationships     12 years  
Finite-lived intangible, future amortization expense, next twelve months 85.0   $ 85.0  
Finite-lived intangible, future amortization expense, year 2 85.0   85.0  
Finite-lived intangible, future amortization expense, year 3 85.0   85.0  
Finite-lived intangible, future amortization expense, year 4 50.0   50.0  
Finite-lived intangible, future amortization expense, year 5 30.0   30.0  
Equity Method Investee        
Schedule of Equity Method Investments [Line Items]        
Revenue from equity method investments 301.8 230.2 826.6 658.6
Net income from equity method investments 178.3 126.4 $ 471.3 361.0
Equity Method Investee | Acquired Client Relationships        
Schedule of Equity Method Investments [Line Items]        
Weighted average client-acquired relationships     10 years  
Amortization expense during the period 25.9 14.0 $ 71.7 43.0
Finite-lived intangible, future amortization expense, next twelve months 100.0   100.0  
Finite-lived intangible, future amortization expense, year 2 100.0   100.0  
Finite-lived intangible, future amortization expense, year 3 80.0   80.0  
Finite-lived intangible, future amortization expense, year 4 80.0   80.0  
Finite-lived intangible, future amortization expense, year 5 80.0   80.0  
Systematica Investment LP and Baring Private Equity Asia | Equity Method Investee | Acquired Client Relationships        
Schedule of Equity Method Investments [Line Items]        
Amortization expense during the period $ 15.5 $ 3.7 $ 33.9 $ 11.2