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SHAREHOLDERS' EQUITY - Schedule of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Equity [Abstract] |  |
Net unrealized losses on investments having no allowance for credit losses | $ (1,281.6) | $ (1,235.2)
Unrealized losses on investments with an allowance for credit losses | (1,108.7) | (931.0)
Change in discount rates for liability for future policy benefits | 624.5 | 133.4
Change in instrument-specific credit risk for market risk benefits | 1.4 | 4.8
Deferred income tax assets | 393.0 | 451.2
Accumulated other comprehensive loss | $ (1,371.4) | $ (1,576.8)

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