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BUSINESS SEGMENT INFORMATION - Narrative (Details) $ in Millions | 3 Months Ended | 12 Months Ended
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Mar. 31, 2024 guaranteedLivingBenefitRider clientChannel segment | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Segment Reporting Information [Line Items] |  |  |
Number of reportable segments | segment | 6 |  |
Corporate and Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Impact of collateral expense |  | $ 37.8 | $ 5.7
Investment Management and Research |  |  |
Segment Reporting Information [Line Items] |  |  |
Number of main client channels | clientChannel | 3 |  |
Legacy |  |  |
Segment Reporting Information [Line Items] |  |  |
Number of guaranteed living benefit riders | guaranteedLivingBenefitRider | 4 |  |
Legacy | Adjustments |  |  |
Segment Reporting Information [Line Items] |  |  |
Impact of collateral expense |  | (4.2) | (1.0)
Individual Retirement | Adjustments |  |  |
Segment Reporting Information [Line Items] |  |  |
Impact of collateral expense |  | (4.0) | (0.8)
Group Retirement | Adjustments |  |  |
Segment Reporting Information [Line Items] |  |  |
Impact of collateral expense |  | (7.7) | (1.4)
Protection Solutions | Adjustments |  |  |
Segment Reporting Information [Line Items] |  |  |
Impact of collateral expense |  | $ (21.9) | $ (2.5)

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- Definition Number Of Guaranteed Living Benefit Riders + References No definition available. + Details
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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-18 + 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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