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Variable Interest Entities (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Surplus Notes and Guarantee Fund Certificates, Reciprocal Exchange |  |  | $ 6.0 |  | $ 4.0
Surplus Notes and Guarantee Fund Certificates, Additional Reciprocal Exchange |  |  | 2.0 |  |
Income Tax Expense (Benefit) | $ 17.5 | $ (18.8) | 33.9 | $ (42.6) |
Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Proceeds from Equity Method Investment, Distribution | 0.5 | 0.5 | 1.0 | 1.0 |
Income (Loss) from Equity Method Investments | 0.6 | 0.8 | 1.0 | 1.5 |
Income Tax Credits and Adjustments | 0.0 | 0.0 | 0.0 | (0.1) |
Income Tax Expense (Benefit) | (0.1) | $ (0.1) | (0.2) | $ (0.3) |
Cash and Cash Equivalents, at Carrying Value | 2.5 |  | 2.5 |  | 2.7
Property, Plant and Equipment, Net | 253.2 |  | 253.2 |  | 256.2
Other Assets | 8.9 |  | 8.9 |  | 7.5
Assets | 264.6 |  | 264.6 |  | 266.4
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | $ 17.3 |  | $ 17.3 |  | $ 17.3

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