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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 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Total          
Beginning balance, net book value       $ 1,182.0  
Intangible amortization and impairments $ (31.9)   $ (21.1) (133.4) $ (72.0)
Ending balance, net book value 1,035.2     1,035.2  
Acquired Client Relationships          
Definite-lived          
Beginning balance, gross book value       1,248.8  
Beginning balance, accumulated amortization       (1,039.0)  
Beginning balance, net book value       209.8  
Intangible amortization and impairments       (62.7)  
Foreign currency translation, gross       (3.2)  
Foreign currency translation, accumulated amortization       1.7  
Foreign currency translation, net       (1.5)  
Transfers, gross book value       (85.7)  
Transfers, accumulated amortization       85.7  
Ending balance, gross book value 1,159.9     1,159.9  
Ending balance, accumulated amortization (1,014.3)     (1,014.3)  
Ending balance, net book value 145.6     145.6  
Indefinite-lived          
Beginning balance, net book value       972.2  
Intangible impairments (14.0) $ (60.3)   (70.7)  
Foreign currency translation       (11.9)  
Ending balance, net book value 889.6     889.6  
Total          
Beginning balance, net book value       1,182.0  
Intangible amortization and impairments       (133.4)  
Foreign currency translation       (13.4)  
Ending balance, net book value $ 1,035.2     $ 1,035.2