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Goodwill and Acquired Client Relationships - Schedule of Changes in Goodwill (Details)
$ in Millions
6 Months Ended
Jun. 30, 2018
USD ($)
Goodwill [Roll Forward]  
Balance, as of December 31, 2017 $ 2,662.5
Foreign currency translation (13.9)
Balance, as of June 30, 2018 $ 2,648.6