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Goodwill and Acquired Client Relationships - Schedule of Changes in Goodwill (Details)
$ in Millions
9 Months Ended
Sep. 30, 2017
USD ($)
Goodwill [Roll Forward]  
Balance, as of December 31, 2016 $ 2,628.1
Foreign currency translation 33.7
Balance, as of September 30, 2017 $ 2,661.8