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BUSINESS, BASIS OF PRESENTATION, AND SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2025	Mar. 31, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Market Risk Benefit [Line Items]
Goodwill	$ 69.5			$ 69.5
Intangible assets	27.2			27.2
Goodwill and other asset impairment	96.7		$ 0.0	96.7	$ 0.0
Change in fair value of market risk benefits	$ 12.4		20.9	$ 8.0	45.6
Overstatement of embedded derivative		$ 31.7				$ 21.6
Fixed maturities, available for sale, fair value, decrease						110.4
Investments held by variable interest entities increased						$ 1.5
Market Risk Benefits | Adjustments
Market Risk Benefit [Line Items]
Change in fair value of market risk benefits			$ (4.8)		$ (15.6)

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