INVESTMENTS - Schedule of Net Investment Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Net Investment Income [Line Items]
Total	$ 10.1	$ 9.9	$ 20.1	$ 19.3
Impairment loss on other investments	(4.4)	0.0	(4.4)	0.0
Investment expense	(0.7)	(0.5)	(2.0)	(1.2)
Net investment income	5.0	9.4	13.7	18.1
Interest on fixed maturities and short-term investments
Net Investment Income [Line Items]
Total	5.3	3.6	10.0	7.0
Interest on cash, cash equivalents, restricted cash, and restricted cash equivalents
Net Investment Income [Line Items]
Total	$ 4.8	$ 6.3	$ 10.1	$ 12.3

Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments.