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INVESTMENTS - TOTAL INVESTMENT GAINS (LOSSES) (Details) - USD ($) | 3 Months Ended
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Mar. 31, 2026 | Mar. 31, 2025
Realized investment gains (losses): |  |
Total realized investment losses | $ (7,800,000) | $ (3,800,000)
Change in allowance for credit losses and write-downs | (9,600,000) | (9,600,000)
Change in fair value of equity securities | (2,000,000.0) | (2,500,000)
Other changes in fair value | (3,300,000) | 9,100,000
Other investment losses | (14,900,000) | (3,000,000.0)
Total investment losses | (22,700,000) | (6,800,000)
Increase (decrease) in equity securities, FV-NI, held at end of period | (3,600,000) | 400,000
Change in estimated fair value of trading securities | (3,300,000) | 5,800,000
Embedded Derivative Related to Fixed Maturity Securities |  |
Realized investment gains (losses): |  |
Increase (decrease) in fair value of certain fixed maturity investments with embedded derivatives | (2,900,000) | 7,900,000
Reinsurance Contract | Coinsurance |  |
Realized investment gains (losses): |  |
Increase (decrease) in fair value of certain fixed maturity investments with embedded derivatives | (400,000) | 1,200,000
Total fixed maturities, available for sale |  |
Realized investment gains (losses): |  |
Gross realized gains on sales of fixed maturities, available for sale | 52,200,000 | 1,000,000.0
Gross realized losses on sales of fixed maturities, available for sale | (56,300,000) | (2,800,000)
Equity securities, net | (1,900,000) | 0
Other, net | $ (1,800,000) | $ (2,000,000.0)

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