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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, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Total        
Beginning balance, Net Book Value     $ 1,777.8  
Intangible amortization and impairments $ (6.3) $ (7.3) (89.6) $ (14.5)
Ending balance, Net Book Value 1,716.1   1,716.1  
Acquired Client Relationships        
Total        
Beginning balance, Net Book Value     1,777.8  
Intangible amortization and impairments     89.6  
Foreign currency translation     27.9  
Ending balance, Net Book Value 1,716.1   1,716.1  
Acquired Client Relationships        
Indefinite-lived        
Beginning balance, Net Book Value     1,597.5  
Intangible amortization and impairments     (77.0)  
Foreign currency translation     28.1  
Ending balance, Net Book Value 1,548.6   1,548.6  
Acquired Client Relationships        
Definite-lived        
Beginning balance, Gross Book Value     1,255.5  
Beginning balance, Accumulated Amortization     (1,075.2)  
Beginning balance, Net Book Value     180.3  
Intangible amortization and impairments (6.3) $ (7.3) (12.6) $ (14.5)
Foreign currency translation, Gross Book Value     14.5  
Foreign currency translation, Accumulated Amortization     (14.7)  
Foreign currency translation, Net Book Value     (0.2)  
Ending balance, Gross Book Value 1,270.0   1,270.0  
Ending balance, Accumulated Amortization (1,102.5)   (1,102.5)  
Ending balance, Net Book Value $ 167.5   $ 167.5