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SHAREHOLDERS' EQUITY - SCHEDULE OF ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
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Equity [Abstract] |  |
Net unrealized losses on investments having no allowance for credit losses | $ (803.0) | $ (1,235.2)
Unrealized losses on investments with an allowance for credit losses | (699.8) | (931.0)
Change in discount rates for liability for future policy benefits | 63.4 | 133.4
Change in instrument-specific credit risk for market risk benefits | 2.1 | 4.8
Deferred income tax assets | 321.3 | 451.2
Accumulated other comprehensive loss | $ (1,116.0) | $ (1,576.8)

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