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INVESTMENTS - SCHEDULE OF REALIZED GAIN (LOSS) ON INVESTMENTS (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Realized investment gains (losses): |  |  |
Total realized investment gains (losses) | $ (75.6) | $ (69.3) | $ (17.9)
Change in allowance for credit losses and write-downs | (2.6) | 8.1 | (52.6)
Change in fair value of equity securities | (0.4) | 0.4 | (2.9)
Gain on dissolution of variable interest entities | 3.9 | 0.0 | 0.0
Other changes in fair value | 24.8 | (8.2) | (62.0)
Other investment gains (losses) | 25.7 | 0.3 | (117.5)
Total investment losses | (49.9) | (69.0) | (135.4)
Variable interest entities change in allowance for current expected credit losses | 1.8 | 2.4 | (1.8)
Increase (decrease) in equity securities, FV-NI, held at end of period | (0.3) | 0.1 | (7.3)
Change in estimated fair value of trading securities | 3.7 | (2.0) | (43.3)
Total fixed maturities, available for sale |  |  |
Realized investment gains (losses): |  |  |
Gross realized gains on sales of fixed maturities, available for sale | 11.5 | 13.4 | 99.8
Gross realized losses on sales of fixed maturities, available for sale | (54.9) | (58.9) | (104.0)
Equity securities, net | 0.0 | (0.6) | (8.3)
Other, net | $ (32.2) | $ (23.2) | $ (5.4)

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