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Goodwill and Acquired Client Relationships - Schedule of Changes in Goodwill (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Goodwill [Roll Forward]    
Balance, beginning of period $ 2,689.2 $ 2,661.4
New investments 0.0 30.5
Foreign currency translation (40.5) (1.1)
Other 0.0 (1.6)
Balance, end of period $ 2,648.7 $ 2,689.2