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Goodwill and Acquired Client Relationships (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Goodwill      
Intangible amortization and impairments $ 115,400,000 $ 122,200,000 $ 128,200,000
Intangible Future Annual Amortization Expense, Year 1 37,100,000    
Intangible Future Annual Amortization Expense, Year 2 37,100,000    
Intangible Future Annual Amortization Expense, Year 3 37,100,000    
Intangible Future Annual Amortization Expense, Year 4 37,100,000    
Intangible Future Annual Amortization Expense, Year 5 37,100,000    
Asset impairment charges $ 0 0  
Customer Relationships      
Goodwill      
Weighted average life 10 years    
Intangible amortization and impairments $ 115,400,000 $ 122,200,000  
Intangible Future Annual Amortization Expense, Year 1 110,000,000    
Intangible Future Annual Amortization Expense, Year 2 110,000,000    
Intangible Future Annual Amortization Expense, Year 3 110,000,000    
Intangible Future Annual Amortization Expense, Year 4 110,000,000    
Intangible Future Annual Amortization Expense, Year 5 $ 110,000,000