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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. + 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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