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Variable Interest Entities - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Variable Interest Entity [Line Items] |  |
Surplus Notes and Guarantee Fund Certificates, Reciprocal Exchange | $ 22.0 | $ 4.0
Surplus Notes and Guarantee Fund Certificates, Additional Reciprocal Exchange | 18.0 |
Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Maximum Loss Exposure | $ 17.6 | $ 17.3

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