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INCOME TAXES - Summary of Valuation Allowance Roll Forward (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Valuation allowance - beginning of year | $ 16,918,000 |
Change in valuation allowance | 43,000,000 |
Valuation allowance - end of year | 60,069,000 | $ 16,918,000
Net unrealized investments losses | 71,251,000 | 0
Unrecognized tax benefits | 0 | 0
Ireland |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Valuation allowance - end of year | 41,000,000 |
U.S. | U.S. Foreign Tax Credits |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Valuation allowance - end of year | 2,000,000 |
Other Comprehensive Income | Ireland |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Valuation allowance - end of year | 19,000,000 |
Net income (loss) | Ireland |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Valuation allowance - end of year | 22,000,000 |
Income Tax Expense |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Valuation allowance - beginning of year | 16,918,000 | 20,778,000
Valuation allowance - end of year | 39,782,000 | 16,918,000
Operating loss carryforwards |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Change in valuation allowance | 21,724,000 | (3,422,000)
Foreign tax credit |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Change in valuation allowance | 2,401,000 | (2,048,000)
U.K. branch assets and other foreign rate differentials |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Change in valuation allowance | (1,261,000) | 1,610,000
Accumulated Other Comprehensive Income (Loss) |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Valuation allowance - beginning of year | 0 | 0
Valuation allowance - end of year | 20,287,000 | 0
Change in investment - related items |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Change in valuation allowance | $ 20,287,000 | $ 0

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