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SHAREHOLDERS' EQUITY - SCHEDULE OF ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) | Sep. 30, 2025 | Dec. 31, 2024
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Equity [Abstract] |  |
Net unrealized losses on investments having no allowance for credit losses | $ (628,100,000) | $ (1,281,600,000)
Unrealized losses on investments with an allowance for credit losses | (1,155,500,000) | (1,108,700,000)
Change in discount rates for liability for future policy benefits | 340,700,000 | 624,500,000
Change in instrument-specific credit risk for market risk benefits | 800,000 | 1,400,000
Deferred income tax assets | 323,200,000 | 393,000,000.0
Accumulated other comprehensive loss | (1,118,900,000) | (1,371,400,000)
Amortized cost | 39,900,000 |
Total fixed maturities, available for sale | $ 41,100,000 | $ 0

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