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Goodwill and Acquired Client Relationships - Schedule of Changes in the Components of Acquired Client Relationships (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Intangible Assets    
Impairment Of Intangible Asset Indefinite Lived Excluding Goodwill, Statement Of Income Or Comprehensive Income, Extensible Enumeration, Not Disclosed Flag Indefinite-lived  
Total    
Beginning balance, net book value $ 1,876.0  
Intangible amortization and impairments (12.5) $ (12.6)
Ending balance, net book value 1,866.1  
Acquired Client Relationships    
Indefinite-lived    
Beginning balance, net book value 1,590.6  
Foreign currency translation 6.5  
Transfers (4.1)  
Ending balance, net book value 1,593.0  
Acquired Client Relationships    
Definite-lived    
Beginning balance, gross book value 1,355.1  
Beginning balance, accumulated amortization (1,069.7)  
Beginning balance, net book value 285.4  
Intangible amortization and impairments (12.5)  
Foreign currency translation, gross 0.2  
Foreign currency translation, net 0.2  
Transfers, gross book value (10.3)  
Transfers, accumulated amortization 10.3  
Ending balance, gross book value 1,345.0  
Ending balance, accumulated amortization (1,071.9)  
Ending balance, net book value 273.1  
Total    
Beginning balance, net book value 1,876.0  
Intangible amortization and impairments (12.5)  
Foreign currency translation 6.7  
Transfers (4.1)  
Ending balance, net book value $ 1,866.1