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INVESTMENTS - SCHEDULE OF REALIZED GAIN (LOSS) ON INVESTMENTS (Details) - USD ($) $ in Millions	12 Months Ended
	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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