Variable Interest Entities (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 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