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Segment Information - Depreciation and Amortization Expense by Segment (Details) - USD ($) $ in Millions | 12 Months Ended
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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

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- 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 + Details
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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. + Details
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