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SCHEDULE I SUMMARY OF INVESTMENTS - OTHER THAN INVESTMENTS IN RELATED PARTIES (Details) $ in Millions | Dec. 31, 2025 USD ($)
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Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | $ 10,404.8 | [1]
Fair Value | 10,374.4 |
Amount at which shown in the balance sheet | 10,382.7 | [2]
U.S. Treasury and Government Agencies [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | 2,500.7 | [1]
Fair Value | 2,410.8 |
Amount at which shown in the balance sheet | 2,410.8 | [2]
States, municipalities and political subdivisions [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | 910.8 | [1]
Fair Value | 847.7 |
Amount at which shown in the balance sheet | 847.7 | [2]
Foreign governments [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | 2.5 | [1]
Fair Value | 2.7 |
Amount at which shown in the balance sheet | 2.7 | [2]
Public Utilities Bonds [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | 353.5 | [1]
Fair Value | 355.5 |
Amount at which shown in the balance sheet | 355.5 | [2]
All other corporate bonds [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | 5,916.6 | [1]
Fair Value | 5,918.0 |
Amount at which shown in the balance sheet | 5,918.0 | [2]
Fixed Maturities [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | 9,684.1 | [1]
Fair Value | 9,534.7 |
Amount at which shown in the balance sheet | 9,534.7 | [2]
Public utilities [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | 10.2 | [1]
Fair Value | 26.3 |
Amount at which shown in the balance sheet | 26.3 | [2]
Banks, trust and insurance companies [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | 1.6 | [1]
Fair Value | 3.0 |
Amount at which shown in the balance sheet | 3.0 | [2]
Industrial, miscellaneous and all other [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | 53.5 | [1]
Fair Value | 136.5 |
Amount at which shown in the balance sheet | 136.5 | [2]
Nonredeemable preferred stock [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | 12.4 | [1]
Fair Value | 19.0 |
Amount at which shown in the balance sheet | 19.0 | [2]
Equity Securities Investment Summary [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | 77.7 | [1]
Fair Value | 184.8 |
Amount at which shown in the balance sheet | 184.8 | [2]
Mortgage Loans on Real Estate [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | 255.1 | [1]
Fair Value | 238.7 |
Amount at which shown in the balance sheet | 247.0 | [2]
Other long-term investments [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | 386.1 | [1]
Fair Value | 414.4 |
Amount at which shown in the balance sheet | 414.4 | [2]
Short-Term Investments [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | 1.8 | [1]
Fair Value | 1.8 |
Amount at which shown in the balance sheet | $ 1.8 | [2]
[1] | Original cost of equity securities and, as to fixed maturities, original cost reduced by repayments and adjusted for amortization of premiums and accretion of discounts.
[2] | Mortgage loans on real estate are shown on the balance sheet at unpaid principal balances adjusted for deferred fees or expenses, net of an allowance for credit losses.

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