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FAIR VALUE MEASUREMENTS - CHANGES IN VALUE OF EMBEDDED DERIVATIVES (Details) - Fair Value, Inputs, Level 3 - Fixed Index Annuity Products - Fair Value, Measurements, Recurring - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Liabilities:
Balance at beginning of the period	$ 1,502.4	$ 1,418.0	$ 1,471.6	$ 1,376.7
Premiums less benefits	(7.4)	(19.4)	(23.4)	(56.3)
Change in fair value, net	103.4	153.3	150.2	231.5
Balance at end of the period	$ 1,598.4	$ 1,551.9	$ 1,598.4	$ 1,551.9

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- Definition

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value, Increase (Decrease) in Fair Value

+ References

No definition available.

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- Definition

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value, Premiums Less Benefits

+ References

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- Definition

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- Definition

Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-3

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

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