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Goodwill and Acquired Client Relationships - Schedule of Changes in the Components of Acquired Client Relationships (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Total        
Beginning balance, net book value     $ 1,048,800,000  
Intangible amortization and impairments $ (8,900,000) $ (80,900,000) (16,400,000) $ (101,500,000)
Ending balance, net book value 1,036,800,000   1,036,800,000  
Acquired Client Relationships        
Definite-lived        
Beginning balance, gross book value     1,166,600,000  
Beginning balance, accumulated amortization     (1,026,800,000)  
Beginning balance, net book value     139,800,000  
Intangible amortization and impairments     (16,400,000)  
Foreign currency translation, gross     3,900,000  
Foreign currency translation, accumulated amortization     (3,500,000)  
Foreign currency translation, net     400,000  
Ending balance, gross book value 1,170,500,000   1,170,500,000  
Ending balance, accumulated amortization (1,046,700,000)   (1,046,700,000)  
Ending balance, net book value 123,800,000   123,800,000  
Indefinite-lived        
Beginning balance, net book value     909,000,000.0  
Intangible impairments   (60,300,000) 0  
Foreign currency translation     4,000,000.0  
Ending balance, net book value 913,000,000.0 $ 0 913,000,000.0 $ 0
Total        
Beginning balance, net book value     1,048,800,000  
Intangible amortization and impairments     (16,400,000)  
Foreign currency translation     4,400,000  
Ending balance, net book value $ 1,036,800,000   $ 1,036,800,000