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Equity Method Investments in Affiliates (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Jan. 04, 2016
Schedule of Equity Method Investments        
Amortization period for tax deductible goodwill 15 years      
Amortization expense during the period $ 115.4 $ 122.2 $ 128.2  
Annual amortization expense Year 1 37.1      
Annual amortization expense Year 2 37.1      
Annual amortization expense Year 3 37.1      
Annual amortization expense Year 4 37.1      
Annual amortization expense Year 5 37.1      
Undistributed earnings from equity method investments $ 101.5      
Acquired Client Relationships Under Equity Method Investments        
Schedule of Equity Method Investments        
Weighted average life 14 years      
Amortization expense during the period $ 34.3 $ 32.3    
Ivory Investment Management, L.P. | Acquired Client Relationships Under Equity Method Investments        
Schedule of Equity Method Investments        
Acquired client relationships 200.0      
Payment of contingent payment liability $ 23.3      
Abax Investments (Pty) Ltd and Ivory Investment Management, L.P. [Member] | Acquired Client Relationships Under Equity Method Investments        
Schedule of Equity Method Investments        
Amortization period for tax deductible goodwill 15 years      
Subsequent Event | Systematica Investment LP and Baring Private Equity Asia | Acquired Client Relationships Under Equity Method Investments        
Schedule of Equity Method Investments        
Acquired client relationships       $ 550.0