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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, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Total        
Beginning balance, net book value     $ 1,182.0  
Intangible amortization and impairments $ (80.9) $ (21.2) (101.5) $ (50.9)
Ending balance, net book value 1,052.3   1,052.3  
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     (55.7)  
Foreign currency translation, gross     (7.3)  
Foreign currency translation, accumulated amortization     4.7  
Foreign currency translation, net     (2.6)  
Ending balance, gross book value 1,241.5   1,241.5  
Ending balance, accumulated amortization (1,090.0)   (1,090.0)  
Ending balance, net book value 151.5   151.5  
Indefinite-lived        
Beginning balance, net book value     972.2  
Intangible impairments (60.3)   (45.8)  
Foreign currency translation     (25.6)  
Ending balance, net book value 900.8   900.8  
Total        
Beginning balance, net book value     1,182.0  
Intangible amortization and impairments     (101.5)  
Foreign currency translation     (28.2)  
Ending balance, net book value $ 1,052.3   $ 1,052.3