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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, 2024
Dec. 31, 2023
Dec. 31, 2022
Intangible assets      
Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill), Statement of Income or Comprehensive Income [Extensible Enumeration] Intangible amortization and impairments    
Net Book Value      
Beginning balance, net book value $ 1,812.4    
Intangible amortization and impairments (29.0) $ (48.3) $ (51.6)
Ending balance, net book value 1,777.8 1,812.4  
Acquired client relationships      
Net Book Value      
Beginning balance, net book value 1,812.4 1,876.0  
Veritable Transaction   (28.1)  
Intangible amortization and impairments (29.0) (48.3)  
Foreign currency translation (5.6) 16.9  
Transfers, net book value   (4.1)  
Ending balance, net book value 1,777.8 1,812.4 1,876.0
Acquired client relationships      
Indefinite-lived      
Beginning balance, net book value 1,603.1 1,590.6  
Foreign currency translation (5.6) 16.6  
Transfers, net book value   (4.1)  
Ending balance, net book value 1,597.5 1,603.1 1,590.6
Acquired client relationships      
Definite-lived      
Beginning balance, gross book value 1,260.5 1,355.1  
Beginning balance, accumulated amortization (1,051.2) (1,069.7)  
Beginning balance, net book value 209.3 285.4  
Veritable Transaction, gross book value   (85.1)  
Veritable Transaction, accumulated amortization   57.0  
Veritable Transaction, net book value   (28.1)  
Intangible amortization and impairments (29.0) (48.3) (49.1)
Foreign currency translation, gross book value (5.0) 0.8  
Foreign currency translation, accumulated depreciation 5.0 (0.5)  
Foreign currency translation, net book value   0.3  
Transfers, gross book value   (10.3)  
Transfers   10.3  
Ending balance, gross book value 1,255.5 1,260.5 1,355.1
Ending balance, accumulated amortization (1,075.2) (1,051.2) (1,069.7)
Ending balance, net book value 180.3 $ 209.3 $ 285.4
Acquired client relationships | Non-controlling interests      
Net Book Value      
Finite-lived intangible assets deconsolidated $ 6.7