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Goodwill and Acquired Client Relationships - Schedule of Changes in Goodwill (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Changes in goodwill    
Balance, beginning of period $ 2,662.5 $ 2,628.1
Foreign currency translation (29.1) 34.4
Balance, end of period $ 2,633.4 $ 2,662.5