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Intangible Assets (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jan. 04, 2016
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Intangible Assets        
Amortization and impairment expenses of intangible assets   $ 26.6 $ 27.8  
Acquired Client Relationships        
Intangible Assets        
Weighted average life   10 years    
Amortization and impairment expenses of intangible assets   $ 26.6 27.8  
Number of future annual periods of amortization expense (in years)   5 years   5 years
Annual amortization expense attributable to current equity method Affiliates for next five years        
Remainder of 2016   $ 110.0    
2017   110.0    
2018   110.0    
2019   110.0    
2020   $ 110.0    
Acquired Client Relationships | Affiliated Entity        
Intangible Assets        
Weighted average life   11 years    
Amortization and impairment expenses of intangible assets   $ 14.2 $ 8.8  
Annual amortization expense attributable to current equity method Affiliates for next five years        
Remainder of 2016   55.0    
2017   55.0    
2018   55.0    
2019   55.0    
2020   $ 55.0    
Systematica Investment LP and Baring Private Equity Asia [Member] | Acquired Client Relationships Under Equity Method Investments        
Intangible Assets        
Business acquisition, finite-lived intangibles $ 547.6      
Business acquisition, goodwill, amortization period for tax deductions (in years) 15 years