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Equity Method Investments in Affiliates - Aggregate Purchase Price Allocation (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Jan. 04, 2016
Schedule of Equity Method Investments [Line Items]            
Deferred Tax Liability $ (677.0)   $ (677.0)   $ (660.8)  
Goodwill 2,647.5   2,647.5   2,628.1  
Intangible amortization and impairments 22.0 $ 28.6 43.9 $ 55.3    
Acquired Client Relationships            
Schedule of Equity Method Investments [Line Items]            
Definite-lived acquired client relationships 461.2   461.2   501.9  
Indefinite-lived acquired client relationships 1,014.9   1,014.9   $ 995.5  
Equity Method Investee | Acquired Client Relationships            
Schedule of Equity Method Investments [Line Items]            
Intangible amortization and impairments 24.0 14.8 45.8 29.0    
Equity Method Investee | Systematica Investment LP and Baring Private Equity Asia            
Schedule of Equity Method Investments [Line Items]            
Consideration paid           $ 551.0
Deferred Tax Liability           (32.0)
Goodwill           352.6
Equity Method Investments           551.0
Equity Method Investee | Systematica Investment LP and Baring Private Equity Asia | Acquired Client Relationships            
Schedule of Equity Method Investments [Line Items]            
Definite-lived acquired client relationships           223.1
Indefinite-lived acquired client relationships           $ 7.3
Intangible amortization and impairments $ 3.7 $ 4.5 $ 7.4 $ 7.4