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SHAREHOLDERS' EQUITY - SCHEDULE OF ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
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Equity [Abstract] |  |
Net unrealized losses on investments having no allowance for credit losses | $ (861.1) | $ (1,281.6)
Unrealized losses on investments with an allowance for credit losses | (1,292.7) | (1,108.7)
Change in discount rates for liability for future policy benefits | 555.7 | 624.5
Change in instrument-specific credit risk for market risk benefits | 3.1 | 1.4
Deferred income tax assets | 355.9 | 393.0
Accumulated other comprehensive loss | $ (1,239.1) | $ (1,371.4)

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