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Goodwill and Other Intangible Assets - Goodwill (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Goodwill [Roll Forward]    
Goodwill, Beginning Balance $ 748.0 $ 327.0
Additions from business combinations 0.0 421.0
Goodwill, Ending Balance 748.0  
Wealth    
Goodwill [Roll Forward]    
Goodwill, Beginning Balance 17.0 17.0
Additions from business combinations 0.0 0.0
Goodwill, Ending Balance 17.0  
Health Solutions    
Goodwill [Roll Forward]    
Goodwill, Beginning Balance 343.0 24.0
Additions from business combinations 0.0 319.0
Goodwill, Ending Balance 343.0  
Investment Management    
Goodwill [Roll Forward]    
Goodwill, Beginning Balance 286.0 286.0
Additions from business combinations 0.0 0.0
Goodwill, Ending Balance 286.0  
Corporate    
Goodwill [Roll Forward]    
Goodwill, Beginning Balance 102.0 0.0
Additions from business combinations 0.0 $ 102.0
Goodwill, Ending Balance 102.0  
Corporate | Wealth    
Goodwill [Roll Forward]    
Goodwill, Ending Balance 72.0  
Corporate | Health Solutions    
Goodwill [Roll Forward]    
Goodwill, Ending Balance 20.0  
Corporate | Investment Management    
Goodwill [Roll Forward]    
Goodwill, Ending Balance $ 10.0