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Goodwill and Acquired Client Relationships - Additional Information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Goodwill      
Intangible amortization and impairments $ 110,200,000 $ 115,400,000 $ 122,200,000
Definite-lived and indefinite-lived intangibles impairments $ 0 0  
Customer Relationships      
Goodwill      
Weighted average life 10 years    
Intangible amortization and impairments $ 107,700,000 $ 115,400,000  
Intangible Future Annual Amortization Expense, Year 1 100,000,000    
Intangible Future Annual Amortization Expense, Year 2 100,000,000    
Intangible Future Annual Amortization Expense, Year 3 100,000,000    
Intangible Future Annual Amortization Expense, Year 4 100,000,000    
Intangible Future Annual Amortization Expense, Year 5 $ 100,000,000