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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 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Total        
Beginning balance, Net Book Value     $ 1,812.4  
Intangible amortization and impairments $ (7.3) $ (12.5) (14.5) $ (25.0)
Ending balance, Net Book Value 1,795.6   1,795.6  
Acquired Client Relationships        
Indefinite-lived        
Beginning balance, Net Book Value     1,603.1  
Foreign currency translation     (2.3)  
Ending balance, Net Book Value 1,600.8   1,600.8  
Acquired Client Relationships        
Definite-lived        
Beginning balance, Gross Book Value     1,260.5  
Beginning balance, Accumulated Amortization     (1,051.2)  
Beginning balance, Net Book Value     209.3  
Intangible amortization and impairments (7.3) $ (12.5) (14.5) $ (25.0)
Foreign currency translation, Gross Book Value     (1.8)  
Foreign currency translation, Accumulated Amortization     1.8  
Foreign currency translation, Net Book Value     0.0  
Ending balance, Gross Book Value 1,258.7   1,258.7  
Ending balance, Accumulated Amortization (1,063.9)   (1,063.9)  
Ending balance, Net Book Value 194.8   194.8  
Total        
Beginning balance, Net Book Value     1,812.4  
Intangible amortization and impairments     (14.5)  
Foreign currency translation     (2.3)  
Ending balance, Net Book Value $ 1,795.6   $ 1,795.6