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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