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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Effects of Reinsurance [Line Items] |  |  |  |
Ceded written premiums | $ 80 | $ 82 | $ 250 | $ 169
Ceded earned premiums | 92 | 94 | 216 | 180
Ceded losses and LAE | 0 | 26 | 121 | 64
Assumed written premiums | 2 | 1 | 5 | 3
Assumed earned premiums | 2 | 1 | 5 | 3
Assumed losses and LAE | $ 0 | $ 0 | $ 0 | $ 0

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