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INVESTMENTS - TOTAL INVESTMENT GAINS (LOSSES) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Realized investment gains (losses):
Total realized investment gains (losses)	$ (21.6)	$ (8.2)	$ (58.0)	$ 3.6
Change in allowance for credit losses	(2.3)	7.5	(13.7)	(46.9)
Change in fair value of equity securities	(0.9)	(0.7)	(0.5)	(2.4)
Other changes in fair value	(4.5)	(16.3)	(7.0)	(53.5)
Other investment losses	(7.7)	(9.5)	(21.2)	(102.8)
Net realized investment gains (losses)	(29.3)	(17.7)	(79.2)	(99.2)
Variable interest entities, change in allowance for current expected credit losses	1.6	5.7	2.6	(2.8)
Increase (decrease) in equity securities, FV-NI, held at end of period			(0.7)	(6.9)
Change in estimated fair value of trading securities			(8.0)	(36.6)
Total fixed maturities, available for sale
Realized investment gains (losses):
Gross realized gains on sales of fixed maturities, available for sale	1.3	18.1	11.4	96.4
Gross realized losses on sales of fixed maturities, available for sale	(9.8)	(24.4)	(45.8)	(81.3)
Equity securities, net	0.0	0.0	(0.6)	(8.3)
Other, net	$ (13.1)	$ (1.9)	$ (23.0)	$ (3.2)

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