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INVESTMENTS - TOTAL INVESTMENT GAINS (LOSSES) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Realized investment gains (losses):
Total realized investment losses	$ (21.3)	$ (26.3)	$ (25.1)	$ (36.3)
Change in allowance for credit losses	(1.0)	4.1	(10.7)	5.6
Change in fair value of equity securities	4.6	(0.7)	2.1	0.2
Other changes in fair value	(0.7)	5.7	8.5	17.3
Gain on liquidation of variable interest entities	0.0	0.0	0.0	3.8
Other investment gains (losses)	2.9	9.1	(0.1)	26.9
Total investment gains (losses)	(18.4)	(17.2)	(25.2)	(9.4)
Variable interest entities, change in allowance for current expected credit losses	(0.2)	(1.5)	1.0	(0.3)
Increase (decrease) in equity securities, FV-NI, held at end of period	4.2	(0.7)	4.8	0.3
Change in estimated fair value of trading securities	0.8	0.0	6.6	4.7
Embedded Derivative Related to Fixed Maturity Securities
Realized investment gains (losses):
Increase (decrease) in fair value of certain fixed maturity investments with embedded derivatives	(0.8)	5.8	7.2	17.1
Coinsurance | Reinsurance Contract
Realized investment gains (losses):
Increase (decrease) in fair value of certain fixed maturity investments with embedded derivatives	0.1	(0.1)	1.3	0.2
Total Fixed Maturities, Available For Sale
Realized investment gains (losses):
Gross realized gains on sales of fixed maturities, available for sale	1.9	0.9	2.9	3.0
Gross realized losses on sales of fixed maturities, available for sale	(21.8)	(27.6)	(24.6)	(33.5)
Equity securities, net	(0.5)	(0.1)	(0.5)	(0.1)
Other, net	$ (0.9)	$ 0.5	$ (2.9)	$ (5.7)

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