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Segment Information - Depreciation and Amortization Expense by Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Information: Depreciation and amortization expense
Total segment depreciation and amortization expense included in pre-tax operating earnings	$ 202.9	$ 202.9	$ 208.0
Depreciation and amortization expense related to exited business		27.1
Depreciation and amortization expense	202.9	230.0	208.0
Retirement and Income Solutions
Segment Information: Depreciation and amortization expense
Depreciation and amortization expense	85.3	86.2	81.7
Principal Asset Management
Segment Information: Depreciation and amortization expense
Depreciation and amortization expense	76.0	74.6	78.4
Benefits and Protection
Segment Information: Depreciation and amortization expense
Depreciation and amortization expense	23.9	23.7	24.2
Corporate
Segment Information: Depreciation and amortization expense
Depreciation and amortization expense	$ 17.7	$ 18.4	$ 23.7

X

- Definition

Amount of depreciation and amortization expense for the reportable segments.

+ References

No definition available.

+ Details

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- Definition

Amount of depreciation and amortization expense for the reportable segments from exited business.

+ References

No definition available.

+ Details

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- Definition

The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-28

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482099/360-10-50-1

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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