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Equity Method Investments in Affiliates - Additional Information (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Schedule of Equity Method Investments    
Amortization expense during the period $ 21.9 $ 26.6
Revenue from equity method investments 265.6 206.1
Net income from equity method investments $ 148.6 111.6
Acquired Client Relationships Under Equity Method Investments    
Schedule of Equity Method Investments    
Weighted average client-acquired relationships 13 years  
Finite-lived intangible, future amortization expense, next twelve months $ 80.0  
Finite-lived intangible, future amortization expense, year 2 80.0  
Finite-lived intangible, future amortization expense, year 3 80.0  
Finite-lived intangible, future amortization expense, year 4 80.0  
Finite-lived intangible, future amortization expense, year 5 80.0  
Affiliated Entity | Acquired Client Relationships Under Equity Method Investments    
Schedule of Equity Method Investments    
Amortization expense during the period $ 21.7 $ 14.2