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SHAREHOLDERS' EQUITY - SCHEDULE OF ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Millions | Mar. 31, 2026 | Dec. 31, 2025
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Equity [Abstract] |  |
Net unrealized losses on investments having no allowance for credit losses | $ (814.7) | $ (661.6)
Unrealized losses on investments with an allowance for credit losses | (1,346.6) | (1,193.9)
Change in discount rates for liability for future policy benefits | 593.2 | 421.1
Change in instrument-specific credit risk for market risk benefits | 1.6 | 0.9
Deferred income tax assets | 348.9 | 318.5
Accumulated other comprehensive loss | (1,217.6) | (1,115.0)
Amortized cost | 13.4 | 12.0
Total fixed maturities, available for sale | $ 14.2 | $ 13.0

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