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Variable Interest Entities (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2025	Dec. 31, 2024
Schedule of Equity Method Investments [Line Items]
Surplus Notes and Guarantee Fund Certificates, Reciprocal Exchange	$ 29.0	$ 22.0
Surplus Notes and Guarantee Fund Certificates, Additional Reciprocal Exchange	7.0
Variable Interest Entity, Not Primary Beneficiary
Schedule of Equity Method Investments [Line Items]
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	$ 17.4	$ 17.6

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- Definition

Surplus Notes and Guarantee Fund Certificates, Additional Reciprocal Exchange

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
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The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE).

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