INVESTMENTS - PREDECESSOR COMPANY - Realized Investment Gains (Losses), Net (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Net Investment Income [Line Items]
Total	$ 481,000	$ (1,907,000)	$ 7,489,000	$ (5,261,000)
Equity securities
Net Investment Income [Line Items]
Total	(21,000)	(27,000)	1,302,000	(4,000)
Commercial mortgage and other loans
Net Investment Income [Line Items]
Total	0		53,000	(2,000)
Derivatives
Net Investment Income [Line Items]
Total	502,000	$ (912,000)	6,124,000	(5,262,000)
Other invested assets
Net Investment Income [Line Items]
Total	0		10,000	5,000
Short-term investments and cash equivalents
Net Investment Income [Line Items]
Total	$ 0		$ 0	$ 2,000