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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, 2021
Mar. 31, 2020
Total    
Beginning balance, net book value $ 1,048.8  
Intangible amortization and impairments (7.5) $ (20.6)
Ending balance, net book value 1,044.3  
Acquired Client Relationships    
Definite-lived    
Beginning balance, gross book value 1,166.6  
Beginning balance, accumulated amortization (1,026.8)  
Beginning balance, net book value 139.8  
Intangible amortization and impairments (7.5)  
Foreign currency translation, gross 1.4  
Foreign currency translation, accumulated amortization (1.2)  
Foreign currency translation, net 0.2  
Ending balance, gross book value 1,168.0  
Ending balance, accumulated amortization (1,035.5)  
Ending balance, net book value 132.5  
Indefinite-lived    
Beginning balance, net book value 909.0  
Intangible impairments 0.0  
Foreign currency translation 2.8  
Ending balance, net book value 911.8  
Total    
Beginning balance, net book value 1,048.8  
Intangible amortization and impairments (7.5)  
Foreign currency translation 3.0  
Ending balance, net book value $ 1,044.3