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RESERVE FOR LOSSES AND LOSS EXPENSES - Narrative (Details) | Aug. 05, 2019 | Aug. 04, 2019 | Mar. 20, 2017 | Mar. 19, 2017
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Motor Reserve Class | Reinsurance |  |  |  |
Claims Development [Line Items] |  |  |  |
Discount rate (percent) | 0.25% | 0.75% | 0.75% | (2.50%)

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