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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
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Mar. 31, 2025 | Mar. 31, 2024
Liabilities: |  |
Balance at beginning of the period | $ 1,493.2 | $ 1,376.7
Premiums less benefits | (8.5) | (17.8)
Change in fair value, net | (2.8) | 67.9
Balance at end of the period | $ 1,481.9 | $ 1,426.8

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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. + Details
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- Definition Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value, Premiums Less Benefits + References No definition available. + Details
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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 + Details
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