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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, 2023
Dec. 31, 2022
Dec. 31, 2021
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 $ 1,876.0    
Intangible amortization and impairments (48.3) $ (51.6) $ (35.7)
Ending balance, net book value 1,812.4 1,876.0  
Non-controlling interests:      
Net Book Value      
Finite-lived intangible assets deconsolidated 3.5    
Acquired client relationships      
Indefinite-lived      
Beginning balance, net book value 1,590.6 1,630.3  
Foreign currency translation 16.6 (37.2)  
Transfers, net book value (4.1)    
Ending balance, net book value 1,603.1 1,590.6 1,630.3
Net Book Value      
Intangible amortization and impairments   (2.5)  
Acquired client relationships      
Definite-lived      
Beginning balance, gross book value 1,355.1 1,364.2  
Beginning balance, accumulated amortization (1,069.7) (1,028.1)  
Beginning balance, net book value 285.4 336.1  
Intangible amortization and impairments (48.3) (49.1)  
Foreign currency translation, gross book value 0.8 (9.1)  
Foreign currency translation, accumulated depreciation (0.5) 7.5  
Foreign currency translation, net book value 0.3 (1.6)  
Veritable Transaction, gross book value (85.1)    
Veritable Transaction, accumulated amortization 57.0    
Veritable Transaction, net book value (28.1)    
Transfers, gross book value (10.3)    
Transfers, accumulated amortization 10.3    
Ending balance, gross book value 1,260.5 1,355.1 1,364.2
Ending balance, accumulated amortization (1,051.2) (1,069.7) (1,028.1)
Ending balance, net book value 209.3 285.4 336.1
Net Book Value      
Beginning balance, net book value 1,876.0 1,966.4  
Veritable Transaction (28.1)    
Intangible amortization and impairments (48.3) (51.6)  
Foreign currency translation 16.9 (38.8)  
Transfers, net book value (4.1)    
Ending balance, net book value 1,812.4 $ 1,876.0 $ 1,966.4
Acquired client relationships | Non-controlling interests:      
Net Book Value      
Finite-lived intangible assets deconsolidated $ 6.7