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Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2025
Fair Value Disclosures [Abstract] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis | The valuation of assets and liabilities measured at fair value in Company’s Condensed Consolidated Balance Sheets at September 30, 2025 is summarized below. The Company had no material liabilities that are measured and reported at fair values.
|  | Fair Value Measurements |  |
(Dollars in Millions) |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Measured at Net Asset Value |  | Total Fair Value
Assets: |  |  |  |  |  |  |  |  |  |
Fixed Maturities: |  |  |  |  |  |  |  |  |  |
U.S. Government and Government Agencies and Authorities |  | $ | 103.9 |  |  | $ | 488.0 |  |  | $ | — |  |  | $ | — |  |  | $ | 591.9 |
States and Political Subdivisions |  | — |  |  | 1,241.4 |  |  | 1.8 |  |  | — |  |  | 1,243.2 |
Foreign Governments |  | — |  |  | 9.5 |  |  | 2.5 |  |  | — |  |  | 12.0 |
Corporate Securities: |  |  |  |  |  |  |  |  |  |
Bonds and Notes |  | — |  |  | 3,293.5 |  |  | 280.7 |  |  | — |  |  | 3,574.2 |
Redeemable Preferred Stock |  | — |  |  | 5.9 |  |  | 4.4 |  |  | — |  |  | 10.3 |
Collateralized Loan Obligations |  | — |  |  | 812.2 |  |  | 5.7 |  |  | — |  |  | 817.9 |
Other Mortgage and Asset-backed |  | — |  |  | 335.9 |  |  | 34.9 |  |  | — |  |  | 370.8 |
Total Investments in Fixed Maturities |  | 103.9 |  |  | 6,186.4 |  |  | 330.0 |  |  | — |  |  | 6,620.3 |
Equity Securities at Fair Value: |  |  |  |  |  |  |  |  |  |
Preferred Stocks: |  |  |  |  |  |  |  |  |  |
Finance, Insurance and Real Estate |  | — |  |  | 11.6 |  |  | 2.6 |  |  | — |  |  | 14.2 |
Other Industries |  | — |  |  | 5.6 |  |  | — |  |  | — |  |  | 5.6 |
Common Stocks: |  |  |  |  |  |  |  |  |  |
Finance, Insurance and Real Estate |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Other Industries |  | 0.2 |  |  | — |  |  | 1.4 |  |  | — |  |  | 1.6 |
Other Equity Interests: |  |  |  |  |  |  |  |  |  |
Exchange Traded Funds |  | 76.6 |  |  | — |  |  | — |  |  | — |  |  | 76.6 |
Limited Liability Companies and Limited Partnerships |  | — |  |  | — |  |  | — |  |  | 204.0 |  |  | 204.0 |
Total Investments in Equity Securities at Fair Value |  | 76.8 |  |  | 17.2 |  |  | 4.0 |  |  | 204.0 |  |  | 302.0 |
Other Investments: |  |  |  |  |  |  |  |  |  |
Derivative Instrument Classified as Cash Flow Hedge |  | — |  |  | 2.7 |  |  | — |  |  | — |  |  | 2.7 |
Total Assets |  | $ | 180.7 |  |  | $ | 6,206.3 |  |  | $ | 334.0 |  |  | $ | 204.0 |  |  | $ | 6,925.0 |
The valuation of assets and liabilities measured at fair value in the Company’s Consolidated Balance Sheets at December 31, 2024 is summarized below.
|  | Fair Value Measurements |  |
(Dollars in Millions) |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Measured at Net Asset Value |  | Total Fair Value
Assets: |  |  |  |  |  |  |  |  |  |
Fixed Maturities: |  |  |  |  |  |  |  |  |  |
U.S. Government and Government Agencies and Authorities |  | $ | 86.8 |  |  | $ | 400.0 |  |  | $ | — |  |  | $ | — |  |  | $ | 486.8 |
States and Political Subdivisions |  | — |  |  | 1,231.4 |  |  | 1.8 |  |  | — |  |  | 1,233.2 |
Foreign Governments |  | — |  |  | 6.6 |  |  | — |  |  | — |  |  | 6.6 |
Corporate Securities: |  |  |  |  |  |  |  |  |  |
Bonds and Notes |  | — |  |  | 3,325.4 |  |  | 194.2 |  |  | — |  |  | 3,519.6 |
Redeemable Preferred Stocks |  | — |  |  | 4.7 |  |  | 4.2 |  |  | — |  |  | 8.9 |
Collateralized Loan Obligations |  | — |  |  | 741.5 |  |  | — |  |  | — |  |  | 741.5 |
Other Mortgage and Asset-backed |  | — |  |  | 408.0 |  |  | 5.0 |  |  | — |  |  | 413.0 |
Total Investments in Fixed Maturities |  | 86.8 |  |  | 6,117.6 |  |  | 205.2 |  |  | — |  |  | 6,409.6 |
Equity Securities at Fair Value: |  |  |  |  |  |  |  |  |  |
Preferred Stocks: |  |  |  |  |  |  |  |  |  |
Finance, Insurance and Real Estate |  | — |  |  | 13.1 |  |  | — |  |  | — |  |  | 13.1 |
Other Industries |  | — |  |  | 6.7 |  |  | 2.8 |  |  | — |  |  | 9.5 |
Common Stocks: |  |  |  |  |  |  |  |  |  |
Finance, Insurance and Real Estate |  | 0.3 |  |  | — |  |  | — |  |  | — |  |  | 0.3 |
Other Industries |  | 0.1 |  |  | — |  |  | 1.0 |  |  | — |  |  | 1.1 |
Other Equity Interests: |  |  |  |  |  |  |  |  |  |
Exchange Traded Funds |  | 10.9 |  |  | — |  |  | — |  |  | — |  |  | 10.9 |
Limited Liability Companies and Limited Partnerships |  | — |  |  | — |  |  | — |  |  | 183.6 |  |  | 183.6 |
Total Investments in Equity Securities at Fair Value |  | 11.3 |  |  | 19.8 |  |  | 3.8 |  |  | 183.6 |  |  | 218.5 |
Total Assets |  | $ | 98.1 |  |  | $ | 6,137.4 |  |  | $ | 209.0 |  |  | $ | 183.6 |  |  | $ | 6,628.1 |
Liabilities: |  |  |  |  |  |  |  |  |  |
Accrued Expenses and Other Liabilities: |  |  |  |  |  |  |  |  |  |
Derivative Instruments Designated as Cash Flow Hedges |  | $ | — |  |  | $ | (3.7) |  |  | $ | — |  |  | $ | — |  |  | $ | (3.7) |
Total Liabilities |  | $ | — |  |  | $ | (3.7) |  |  | $ | — |  |  | $ | — |  |  | $ | (3.7) |
Fair Value Measurement Inputs and Valuation Techniques | The table below presents quantitative information about the significant unobservable inputs utilized by the Company in determining fair values for fixed maturity investments classified as Level 3 at September 30, 2025. Valuations for assets presented in the tables below are primarily based on broker/dealer quotes for which there is a lack of transparency as to inputs used to develop the valuations. The quantitative detail of these unobservable inputs is neither provided nor reasonably available to the Company. The weighted average yield is calculated based on fair value.
(Dollars in Millions) |  | Unobservable Input |  | Total Fair Value |  | Range of Unobservable Inputs |  | Weighted-average Yield
Investment-grade |  | Market Yield |  | $ | 91.6 |  |  | 1.6 | % | - | 10.5 | % |  | 7.3 | %
Non-investment-grade: |  |  |  |  |  |  |  |  |  |
Senior Debt |  | Market Yield |  | 116.7 |  |  | 6.6 |  | - | 26.1 |  |  | 10.1 |
Junior Debt |  | Market Yield |  | 27.1 |  |  | 8.5 |  | - | 26.0 |  |  | 13.0 |
Other |  | Various |  | 94.6 |  |  |  |  |  |  |
Total Level 3 Fixed Maturity Investments |  |  |  | $ | 330.0 |  |  |  |  |  |  |
The table below presents quantitative information about the significant unobservable inputs utilized by the Company in determining fair values for fixed maturity investments classified as Level 3 at December 31, 2024. Valuations for assets presented in the tables below are primarily based on broker/dealer quotes for which there is a lack of transparency as to inputs used to develop the valuations. The quantitative detail of these unobservable inputs is neither provided nor reasonably available to the Company. The weighted average yield is calculated based on fair value.
(Dollars in Millions) |  | Unobservable Input |  | Total Fair Value |  | Range of Unobservable Inputs |  | Weighted-average Yield
Investment-grade |  | Market Yield |  | $ | 59.9 |  |  | 3.4 | % | - | 11.6 | % |  | 7.9 | %
Non-investment-grade: |  |  |  |  |  |  |  |  |  |
Senior Debt |  | Market Yield |  | 42.7 |  |  | 7.0 |  | - | 24.1 |  |  | 10.0 |
Junior Debt |  | Market Yield |  | 35.7 |  |  | 9.5 |  | - | 31.0 |  |  | 13.2 |
Other |  | Various |  | 66.9 |  |  |  |  |  |  |
Total Level 3 Fixed Maturity Investments |  |  |  | $ | 205.2 |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation | Information by security type pertaining to the changes in the fair value of the Company’s investments classified as Level 3 for the three months ended September 30, 2025 is presented below.
|  | Fixed Maturities |  | Equity Securities |  |  |  |
(Dollars in Millions) |  | Corporate Bonds and Notes |  | Foreign Governments |  | States and Political Sub- divisions |  | Redeemable Preferred Stocks |  | Collateralized Loan Obligations |  | Other Mortgage- and Asset- backed |  | Preferred and Common Stocks |  |  |  |  |  | Total
Balance, Beginning of Period |  | $ | 261.6 |  |  | $ | — |  |  | $ | 0.2 |  |  | $ | 4.3 |  |  | $ | 52.8 |  |  | $ | 22.5 |  |  | $ | 4.8 |  |  |  |  |  |  | $ | 346.2 |
Total Gains (Losses): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Included in Condensed Consolidated Statements of (Loss) Income |  | 0.4 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (1.9) |  |  |  |  |  |  | (1.5) |
Included in Other Comprehensive Income |  | (4.8) |  |  | — |  |  | (0.1) |  |  | 0.1 |  |  | — |  |  | 0.8 |  |  | 0.4 |  |  |  |  |  |  | (3.6) |
Purchases |  | 87.6 |  |  | 5.0 |  |  | — |  |  | — |  |  | 5.7 |  |  | 13.1 |  |  | (0.5) |  |  |  |  |  |  | 110.9 |
Sales |  | (64.1) |  |  | (2.5) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 1.2 |  |  |  |  |  |  | (65.4) |
Transfers into Level 3 |  | — |  |  | — |  |  | 1.7 |  |  | — |  |  | — |  |  | — |  |  | — |  |  |  |  |  |  | 1.7 |
Transfers out of Level 3 |  | — |  |  | — |  |  | — |  |  | — |  |  | (52.8) |  |  | (1.5) |  |  | — |  |  |  |  |  |  | (54.3) |
Balance, End of Period |  | $ | 280.7 |  |  | $ | 2.5 |  |  | $ | 1.8 |  |  | $ | 4.4 |  |  | $ | 5.7 |  |  | $ | 34.9 |  |  | $ | 4.0 |  |  |  |  |  |  | $ | 334.0 |
Information by security type pertaining to the changes in the fair value of the Company’s investments classified as Level 3 for the three months ended September 30, 2024 is presented below.
|  | Fixed Maturities |  | Equity Securities |  |  |  |  |  |
(Dollars in Millions) |  | Corporate Bonds and Notes |  | States and Political Sub- divisions |  | Redeemable Preferred Stocks |  | Collateralized Loan Obligations |  | Other Mortgage- and Asset- backed |  | Preferred and Common Stocks |  |  |  |  |  | Total
Balance, Beginning of Period |  | $ | 227.3 |  |  | $ | 0.1 |  |  | $ | 4.1 |  |  | $ | 6.8 |  |  | $ | 5.0 |  |  | $ | 3.4 |  |  |  |  |  |  | $ | 246.7 |
Total Gains (Losses): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Included in Condensed Consolidated Statements of (Loss) Income |  | 0.3 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (0.2) |  |  |  |  |  |  | 0.1 |
Included in Other Comprehensive Income |  | 1.7 |  |  | (0.2) |  |  | 0.2 |  |  | — |  |  | 0.3 |  |  | — |  |  |  |  |  |  | 2.0 |
Purchases |  | 30.9 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  |  |  |  |  | 30.9 |
Sales |  | (31.8) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  |  |  |  |  | (31.8) |
Transfers into Level 3 |  | 3.9 |  |  | 1.8 |  |  | — |  |  | — |  |  | — |  |  | — |  |  |  |  |  |  | 5.7 |
Transfers out of Level 3 |  | (1.9) |  |  | — |  |  | — |  |  | (6.8) |  |  | — |  |  | — |  |  |  |  |  |  | (8.7) |
Balance, End of Period |  | $ | 230.4 |  |  | $ | 1.7 |  |  | $ | 4.3 |  |  | $ | — |  |  | $ | 5.3 |  |  | $ | 3.2 |  |  |  |  |  |  | $ | 244.9 |
Information by security type pertaining to the changes in the fair value of the Company’s investments classified as Level 3 for the nine months ended September 30, 2025 is presented below.
|  | Fixed Maturities |  | Equity Securities |  |  |  |
(Dollars in Millions) |  | Corporate Bonds and Notes |  | Foreign Governments |  | States and Political Sub- divisions |  | Redeemable Preferred Stocks |  | Collateralized Loan Obligations |  | Other Mortgage- and Asset- backed |  | Preferred and Common Stocks |  |  |  |  |  | Total
Balance, Beginning of Year |  | $ | 194.2 |  |  | $ | — |  |  | $ | 1.8 |  |  | $ | 4.2 |  |  | $ | — |  |  | $ | 5.0 |  |  | $ | 3.8 |  |  |  |  |  |  | $ | 209.0 |
Total Gains (Losses): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Included in Condensed Consolidated Statements of (Loss) Income |  | 1.9 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  |  |  |  |  | 1.9 |
Included in Other Comprehensive Income |  | (2.1) |  |  | — |  |  | (0.2) |  |  | 0.2 |  |  | — |  |  | 0.7 |  |  | 0.4 |  |  |  |  |  |  | (1.0) |
Purchases |  | 216.5 |  |  | 5.0 |  |  | — |  |  | — |  |  | 125.5 |  |  | 20.8 |  |  | 0.3 |  |  |  |  |  |  | 368.1 |
Sales |  | (134.6) |  |  | (2.5) |  |  | — |  |  | — |  |  | (10.0) |  |  | (0.1) |  |  | (0.5) |  |  |  |  |  |  | (147.7) |
Transfers into Level 3 |  | 5.0 |  |  | — |  |  | 1.7 |  |  | — |  |  | — |  |  | 10.0 |  |  | — |  |  |  |  |  |  | 16.7 |
Transfers out of Level 3 |  | (0.2) |  |  | — |  |  | (1.5) |  |  | — |  |  | (109.8) |  |  | (1.5) |  |  | — |  |  |  |  |  |  | (113.0) |
Balance, End of Period |  | $ | 280.7 |  |  | $ | 2.5 |  |  | $ | 1.8 |  |  | $ | 4.4 |  |  | $ | 5.7 |  |  | $ | 34.9 |  |  | $ | 4.0 |  |  |  |  |  |  | $ | 334.0 |
Information by security type pertaining to the changes in the fair value of the Company’s investments classified as Level 3 for the nine months ended September 30, 2024 is presented below.
|  | Fixed Maturities |  | Equity Securities |  |  |  |  |  |
(Dollars in Millions) |  | Corporate Bonds and Notes |  | States and Political Sub- divisions |  | Redeemable Preferred Stocks |  | Collateralized Loan Obligations |  | Other Mortgage- and Asset- backed |  | Preferred and Common Stocks |  |  |  |  |  | Total
Balance, Beginning of Year |  | $ | 177.1 |  |  | $ | 0.1 |  |  | $ | 7.1 |  |  | $ | — |  |  | $ | 5.2 |  |  | $ | 2.8 |  |  |  |  |  |  | $ | 192.3 |
Total Gains (Losses): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Included in Condensed Consolidated Statements of (Loss) Income |  | 0.2 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 1.6 |  |  |  |  |  |  | 1.8 |
Included in Other Comprehensive Income |  | 2.3 |  |  | (0.6) |  |  | 0.2 |  |  | — |  |  | 0.1 |  |  | — |  |  |  |  |  |  | 2.0 |
Purchases |  | 103.5 |  |  | — |  |  | 1.9 |  |  | 6.8 |  |  | — |  |  | 0.5 |  |  |  |  |  |  | 112.7 |
Sales |  | (48.1) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (1.7) |  |  |  |  |  |  | (49.8) |
Transfers into Level 3 |  | 7.0 |  |  | 3.5 |  |  | — |  |  | — |  |  | — |  |  | — |  |  |  |  |  |  | 10.5 |
Transfers out of Level 3 |  | (11.6) |  |  | (1.3) |  |  | (4.9) |  |  | (6.8) |  |  | — |  |  | — |  |  |  |  |  |  | (24.6) |
Balance, End of Period |  | $ | 230.4 |  |  | $ | 1.7 |  |  | $ | 4.3 |  |  | $ | — |  |  | $ | 5.3 |  |  | $ | 3.2 |  |  |  |  |  |  | $ | 244.9 |
Fair Value Disclosure of Asset and Liability Not Measured at Fair Value | The table below shows investments reported at fair value using NAV and their unfunded commitments by asset class as of September 30, 2025 and December 31, 2024.
(Dollars in Millions) |  | September 30, 2025 |  | December 31, 2024
Asset Class |  | Fair Value Using NAV |  | Unfunded Commitments |  | Fair Value Using NAV |  | Unfunded Commitments
Reported as Equity Method Limited Liability Investments: |  |  |  |  |  |  |  |
Mezzanine Debt |  | $ | 115.2 |  |  | $ | 36.2 |  |  | $ | 116.7 |  |  | $ | 40.8 |
Real Estate |  | 24.3 |  |  | 0.1 |  |  | 27.3 |  |  | — |
Senior Debt |  | 19.5 |  |  | 64.1 |  |  | 19.1 |  |  | 48.2 |
Leveraged Buyout |  | 6.5 |  |  | 0.6 |  |  | 7.5 |  |  | 0.6 |
Secondary Transactions |  | 2.7 |  |  | 1.6 |  |  | 5.5 |  |  | 1.6 |
Distressed Debt |  | 1.4 |  |  | — |  |  | 4.4 |  |  | — |
Other |  | 5.3 |  |  | — |  |  | 5.8 |  |  | 0.1 |
Total Equity Method Limited Liability Investments |  | 174.9 |  |  | 102.6 |  |  | 186.3 |  |  | 91.3 |
Reported as Other Equity Interests at Fair Value: |  |  |  |  |  |  |  |
Mezzanine Debt |  | 115.9 |  |  | 69.8 |  |  | 116.9 |  |  | 67.0 |
Leveraged Buyout |  | 34.5 |  |  | 42.7 |  |  | 19.2 |  |  | 30.4 |
Senior Debt |  | 26.5 |  |  | 6.7 |  |  | 26.3 |  |  | 8.4 |
Distressed Debt |  | 11.1 |  |  | 15.7 |  |  | 11.7 |  |  | 15.0 |
Growth Equity |  | 10.4 |  |  | 5.8 |  |  | 7.0 |  |  | 8.0 |
Secondary Transactions |  | 1.6 |  |  | 1.6 |  |  | 2.4 |  |  | 1.6 |
Real Estate |  | 0.1 |  |  | 0.2 |  |  | — |  |  | — |
Other |  | 3.9 |  |  | 0.2 |  |  | 0.1 |  |  | 0.2 |
Total Reported as Other Equity Interests at Fair Value |  | 204.0 |  |  | 142.7 |  |  | 183.6 |  |  | 130.6 |
Reported as Equity Securities at Modified Cost: |  |  |  |  |  |  |  |
Other |  | 1.8 |  |  | 0.1 |  |  | 1.8 |  |  | — |
Total Reported as Equity Securities at Modified Cost |  | 1.8 |  |  | 0.1 |  |  | 1.8 |  |  | — |
Total Investments Reported at Fair Value Using NAV |  | $ | 380.7 |  |  | $ | 245.4 |  |  | $ | 371.7 |  |  | $ | 221.9 |
Investment Holdings, Other than Securities | The following table includes information related to the Company’s investments in certain private equity funds or hedge funds that calculate a net asset value per share:
Asset Class |  | Investment Category Includes
Mezzanine Debt |  | Funds with investments in junior or subordinated debt and potentially minority equity securities issued by private companies.
Senior Debt |  | Funds with investments in senior or first lien debt and potentially minority equity securities typically issued by private companies.
Distressed Debt |  | Funds with debt or minority equity investments that are made opportunistically in companies that are in or near default or under financial strain with potential to have an active role in restructuring the company.
Secondary Transactions |  | Funds that focus on purchasing third party fund interests from investors seeking liquidity within their own portfolio.
Hedge Fund |  | Funds that focus primarily on investing in public securities with strategy of generating uncorrelated returns to the public markets.
Leveraged Buyout |  | Funds with control equity investments in more mature, positive cash flowing, private companies that are typically purchased with the use of financial leverage.
Growth Equity |  | Funds that invest in early or venture stage companies with high growth potential with view towards generating realizations through sale or initial public offering of company.
Real Estate |  | Funds with investments in multi-family housing properties.
Other |  | Consists of direct investments of preferred equity or minority common equity investments into private companies structured as limited partnerships or limited liability companies.
Fair Value, by Balance Sheet Grouping | Presented below are the carrying values and fair value estimates of financial instruments not carried at fair value.
|  |  |  | September 30, 2025 |  | December 31, 2024
(Dollars in Millions) | Level |  |  | Carrying Value |  | Fair Value |  | Carrying Value |  | Fair Value
Financial Assets: |  |  |  |  |  |  |  |  |  |
Loans to Policyholders | Level 3 |  |  | $ | 279.3 |  |  | $ | 279.3 |  |  | $ | 280.7 |  |  | $ | 280.7 |
Short-term Investments | Level 1 or 2 |  |  | 371.2 |  |  | 371.2 |  |  | 1,037.1 |  |  | 1,037.1 |
Mortgage Loans | Level 3 |  |  | 148.2 |  |  | 148.2 |  |  | 75.3 |  |  | 75.3 |
Company-Owned Life Insurance | Level 2 |  |  | 567.9 |  |  | 567.9 |  |  | 539.2 |  |  | 539.2 |
Equity Securities at Modified Cost | Level 3 |  |  | 22.2 |  |  | 22.2 |  |  | 22.5 |  |  | 22.5 |
Financial Liabilities: |  |  |  |  |  |  |  |  |  |
Long-term Debt | Level 2 |  |  | $ | 943.1 |  |  | $ | 864.6 |  |  | $ | 1,391.6 |  |  | $ | 1,278.4 |
Policyholder Obligations | Level 2 |  |  | 525.2 |  |  | 525.2 |  |  | 541.3 |  |  | 541.3 |

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