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Goodwill and Other Intangible Assets - Changes in Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Changes in Goodwill
Beginning balance, Goodwill	$ 1,608.5	$ 1,598.2
Goodwill from acquisitions	11.3
Foreign currency, Goodwill	(70.1)	10.3
Ending balance, Goodwill	1,549.7	1,608.5
Retirement and Income Solutions
Changes in Goodwill
Beginning balance, Goodwill	675.9	675.9
Goodwill from acquisitions	11.3
Ending balance, Goodwill	687.2	675.9
Principal Asset Management
Changes in Goodwill
Beginning balance, Goodwill	903.1	892.8
Foreign currency, Goodwill	(70.1)	10.3
Ending balance, Goodwill	833.0	903.1
Benefits and Protection
Changes in Goodwill
Beginning balance, Goodwill	29.5	29.5
Ending balance, Goodwill	$ 29.5	$ 29.5

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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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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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