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INVESTMENTS - SCHEDULE OF UNREALIZED APPRECIATION (DEPRECIATION) ON INVESTMENTS INCLUDED IN ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
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Investments, Debt and Equity Securities [Abstract] |  |
Net unrealized losses on investments having no allowance for credit losses | $ (1,506.2) | $ (1,247.0)
Unrealized losses on investments with an allowance for credit losses | (2,038.5) | (1,780.7)
Change in discount rates for liability for future policy benefits | 1,021.6 | 500.7
Change in instrument-specific credit risk for market risk benefits | 7.8 | 12.2
Deferred income tax assets | 558.6 | 557.5
Accumulated other comprehensive loss | $ (1,956.7) | $ (1,957.3)

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