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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, 2025
Mar. 31, 2024
Total    
Beginning balance, Net Book Value $ 1,777.8  
Intangible amortization and impairments (83.3) $ (7.3)
Ending balance, Net Book Value 1,703.9  
Acquired Client Relationships    
Total    
Beginning balance, Net Book Value 1,777.8  
Intangible amortization and impairments 83.3  
Foreign currency translation 9.4  
Ending balance, Net Book Value 1,703.9  
Acquired Client Relationships    
Indefinite-lived    
Beginning balance, Net Book Value 1,597.5  
Intangible amortization and impairments (77.0)  
Foreign currency translation 9.5  
Ending balance, Net Book Value 1,530.0  
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)
Foreign currency translation, Gross Book Value 3.8  
Foreign currency translation, Accumulated Amortization (3.9)  
Foreign currency translation, Net Book Value (0.1)  
Ending balance, Gross Book Value 1,259.3  
Ending balance, Accumulated Amortization (1,085.4)  
Ending balance, Net Book Value $ 173.9