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COLLATERALIZED REINSURANCE, TRUST AGREEMENTS AND OTHER RESTRICTED ASSETS - Narrative (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024
Effects of Reinsurance [Line Items] |  |
Restricted cash | $ 144 | $ 397
Mt Logan Re |  |
Effects of Reinsurance [Line Items] |  |
Percentage of voting common shares owned by Group | 100.00% |

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