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Goodwill and Acquired Client Relationships - Schedule of Changes in Goodwill (Details)
$ in Millions
6 Months Ended
Jun. 30, 2019
USD ($)
Goodwill [Roll Forward]  
Balance, as of December 31, 2018 $ 2,633.4
Foreign currency translation 6.1
Balance, as of June 30, 2019 $ 2,639.5