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COLLATERALIZED REINSURANCE, TRUST AGREEMENTS AND OTHER RESTRICTED ASSETS - Schedule of Premiums and Losses Ceded (Details) - Mt Logan Re - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Effects of Reinsurance [Line Items] |  |  |  |
Ceded written premiums | $ 235 | $ 89 | $ 404 | $ 187
Ceded earned premiums | 79 | 74 | 260 | 172
Ceded losses and LAE | 44 | 26 | 107 | 79
Assumed written premiums | 4 | 2 | 6 | 3
Assumed earned premiums | 4 | 2 | 6 | 3
Assumed losses and LAE | $ 0 | $ 0 | $ 0 | $ 0

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