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BUSINESS SEGMENT INFORMATION - Narrative (Details) $ in Millions	3 Months Ended	12 Months Ended
	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 Client Channels

+ References

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- Definition

Number Of Guaranteed Living Benefit Riders

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- Definition

Other Adjustments To Income, Collateral Expense

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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

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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.

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