Goodwill and Other Intangible Assets - Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023
Goodwill [Roll Forward]
Goodwill, Beginning Balance	$ 748.0	$ 327.0
Additions from business combinations	0.0	421.0
Goodwill, Ending Balance	748.0	748.0
Accumulated impairment of goodwill	0.0
Goodwill, gross	0.0	0.0
Operating Segments \| Wealth Solutions
Goodwill [Roll Forward]
Goodwill, Beginning Balance	17.0	17.0
Additions from business combinations	0.0	0.0
Goodwill, Ending Balance	17.0	17.0
Operating Segments \| 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	343.0
Operating Segments \| 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	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	$ 102.0
Corporate \| Wealth Solutions
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

Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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