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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
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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 |

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- Definition Amount of deferred tax liability attributable to taxable temporary differences. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(26)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(26)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(15)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 + Details
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