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Goodwill and Acquired Client Relationships - Schedule of Changes in Acquired Client Relationships (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Intangible assets      
Impairment Of Intangible Asset Indefinite Lived Excluding Goodwill, Statement Of Income Or Comprehensive Income, Extensible Enumeration, Not Disclosed Flag Indefinite-lived    
Net Book Value      
Beginning balance, net book value $ 1,966.4    
Intangible amortization and impairments (51.6) $ (35.7) $ (140.5)
Ending balance, net book value 1,876.0 1,966.4  
Acquired client relationships      
Indefinite-lived      
Beginning balance, net book value 1,630.3 909.0  
Net investments   725.0  
Foreign currency translation (37.2) (3.7)  
Ending balance, net book value 1,590.6 1,630.3 909.0
Net Book Value      
Intangible amortization and impairments (2.5)    
Acquired client relationships      
Definite-lived      
Beginning balance, gross book value 1,364.2 1,166.6  
Beginning balance, accumulated amortization (1,028.1) (1,026.8)  
Beginning balance, net book value 336.1 139.8  
Net investments   232.0  
Intangible amortization and impairments (49.1) (35.7)  
Foreign currency translation, gross book value (9.1) 0.6  
Foreign currency translation, accumulated depreciation 7.5 (0.6)  
Foreign currency translation, net book value (1.6)    
Transfers, gross book value   (35.0)  
Transfers, accumulated amortization   35.0  
Ending balance, gross book value 1,355.1 1,364.2 1,166.6
Ending balance, accumulated amortization (1,069.7) (1,028.1) (1,026.8)
Ending balance, net book value 285.4 336.1 139.8
Net Book Value      
Beginning balance, net book value 1,966.4 1,048.8  
New investments   957.0  
Intangible amortization and impairments (51.6) (35.7)  
Foreign currency translation (38.8) (3.7)  
Ending balance, net book value $ 1,876.0 $ 1,966.4 $ 1,048.8