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Business Combinations - Schedule of Purchase Price Allocation for Investments (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2014
Business Acquisition      
Goodwill $ 2,668.4 $ 2,628.1 $ 2,652.8
Baker Street Advisors, LLC and myCIO Wealth Partners, L.P.      
Business Acquisition      
Consideration paid 76.1    
Contingent payment obligations 9.3    
Non-controlling interests 33.8    
Enterprise value 119.2    
Acquired client relationships 52.5    
Tangible assets, net 2.4    
Goodwill 64.3    
Total $ 119.2