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Income Taxes - Schedule of Temporary Differences That Give Rise to Net Deferred Income Tax Assets (Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Deferred Income Tax Assets:    
Unearned Premium Reserves $ 52.8 $ 54.0
Tax Capitalization of Policy Acquisition Costs 49.5 46.3
Payroll and Employee Benefit Accruals 34.7 34.8
Investments 147.6 103.4
Net Operating Loss and Credit Carryforwards 14.0 114.6
Other 45.9 32.2
Subtotal 344.5 385.3
Valuation Allowance (38.7) (27.4)
Total Deferred Income Tax Assets 305.8 357.9
Deferred Income Tax Liabilities:    
Insurance Reserves 39.5 12.7
Deferred Policy Acquisition Costs 132.3 124.3
Goodwill and Other Intangible Assets 35.0 35.8
Depreciable Assets 14.6 19.3
Other 4.4 6.0
Total Deferred Income Tax Liabilities 225.8 198.1
Net Deferred Income Tax (Assets) 80.0 159.8
Income Tax Contingency [Line Items]    
Net Deferred Income Tax (Assets) 80.0 $ 159.8
Variable Interest Entity, Primary Beneficiary    
Deferred Income Tax Liabilities:    
Net Deferred Income Tax (Assets) 1.5  
Income Tax Contingency [Line Items]    
Net Deferred Income Tax (Assets) $ 1.5