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Goodwill and Acquired Client Relationships - Schedule of Changes in Goodwill (Details)
$ in Millions
3 Months Ended
Mar. 31, 2020
USD ($)
Goodwill [Roll Forward]  
Balance, as of December 31, 2019 $ 2,651.7
Foreign currency translation (29.9)
Balance, as of March 31, 2020 $ 2,621.8