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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2024
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 the Company’s Consolidated Balance Sheets at December 31, 2024 is summarized below.
(Dollars in Millions) |  | Fair Value Measurements |  |  |  | Total Fair Value
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 |
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 Stock |  | — |  |  | 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) |
The valuation of assets and liabilities measured at fair value in the Company’s Consolidated Balance Sheets at December 31, 2023 is summarized below. The Company had no material liabilities that are measured and reported at fair value.
(Dollars in Millions) |  | Fair Value Measurements |  | Total Fair Value
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 |
Assets: |  |  |  |  |  |  |  |  |  |
Fixed Maturities: |  |  |  |  |  |  |  |  |  |
U.S. Government and Government Agencies and Authorities |  | $ | 98.8 |  |  | $ | 412.7 |  |  | $ | — |  |  | $ | — |  |  | $ | 511.5 |
States and Political Subdivisions |  | — |  |  | 1,401.8 |  |  | 0.1 |  |  | — |  |  | 1,401.9 |
Foreign Governments |  | — |  |  | 3.8 |  |  | — |  |  | — |  |  | 3.8 |
Corporate Securities: |  |  |  |  |  |  |  |  |  |
Bonds and Notes |  | — |  |  | 3,513.7 |  |  | 177.1 |  |  | — |  |  | 3,690.8 |
Redeemable Preferred Stocks |  | — |  |  | 1.2 |  |  | 7.1 |  |  | — |  |  | 8.3 |
Collateralized Loan Obligations |  | — |  |  | 949.8 |  |  | — |  |  | — |  |  | 949.8 |
Other Mortgage and Asset-backed |  | — |  |  | 310.6 |  |  | 5.2 |  |  | — |  |  | 315.8 |
Total Investments in Fixed Maturities |  | 98.8 |  |  | 6,593.6 |  |  | 189.5 |  |  | — |  |  | 6,881.9 |
Equity Securities at Fair Value: |  |  |  |  |  |  |  |  |  |
Preferred Stocks: |  |  |  |  |  |  |  |  |  |
Finance, Insurance and Real Estate |  | — |  |  | 15.6 |  |  | — |  |  | — |  |  | 15.6 |
Other Industries |  | — |  |  | 7.5 |  |  | 2.4 |  |  | — |  |  | 9.9 |
Common Stocks: |  |  |  |  |  |  |  |  |  |
Finance, Insurance and Real Estate |  | 0.6 |  |  | — |  |  | — |  |  | — |  |  | 0.6 |
Other Industries |  | 0.2 |  |  | — |  |  | 0.4 |  |  | — |  |  | 0.6 |
Other Equity Interests: |  |  |  |  |  |  |  |  |  |
Exchange Traded Funds |  | 7.7 |  |  | — |  |  | — |  |  | — |  |  | 7.7 |
Limited Liability Companies and Limited Partnerships |  | — |  |  | — |  |  | — |  |  | 191.4 |  |  | 191.4 |
Total Investments in Equity Securities at Fair Value |  | 8.5 |  |  | 23.1 |  |  | 2.8 |  |  | 191.4 |  |  | 225.8 |
Other Investments: |  |  |  |  |  |  |  |  |  |
Derivative Instruments Not Designated as Hedges |  | — |  |  | 14.7 |  |  | — |  |  | — |  |  | 14.7 |
Total Assets |  | $ | 107.3 |  |  | $ | 6,631.4 |  |  | $ | 192.3 |  |  | $ | 191.4 |  |  | $ | 7,122.4 |
Fair Value Inputs, Assets, Quantitative Information | 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 |  |  |  |  |  |  |
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, 2023. 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 |  | $ | 60.0 |  |  | 4.2 | % | - | 15.8 | % |  | 8.7 | %
Non-investment-grade: |  |  |  |  |  |  |  |  |  |
Senior Debt |  | Market Yield |  | 32.6 |  |  | 9.2 |  | - | 36.7 |  |  | 13.5 |
Junior Debt |  | Market Yield |  | 32.5 |  |  | 11.8 |  | - | 22.5 |  |  | 13.8 |
Other |  | Various |  | 64.4 |  |  |  |  |  |  |
Total Level 3 Fixed Maturity Investments |  |  |  | $ | 189.5 |  |  |  |  |  |  |
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 year ended December 31, 2024 is presented below.
(Dollars In Millions) |  | Fixed Maturities |  | Equity Securities |  |  |  |  |  |
| 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 Consolidated Statements of Income (Loss) |  | 0.6 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 2.2 |  |  |  |  |  |  | 2.8 |
Included in Other Comprehensive Income |  | 0.8 |  |  | (0.5) |  |  | 0.1 |  |  | — |  |  | (0.2) |  |  | — |  |  |  |  |  |  | 0.2 |
Purchases |  | 124.2 |  |  | — |  |  | 1.9 |  |  | 6.8 |  |  | — |  |  | 0.5 |  |  |  |  |  |  | 133.4 |
Sales |  | (104.0) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (1.7) |  |  |  |  |  |  | (105.7) |
Transfers into Level 3 |  | 7.1 |  |  | 3.5 |  |  | — |  |  | — |  |  | — |  |  | — |  |  |  |  |  |  | 10.6 |
Transfers out of Level 3 |  | (11.6) |  |  | (1.3) |  |  | (4.9) |  |  | (6.8) |  |  | — |  |  | — |  |  |  |  |  |  | (24.6) |
Balance, End of Year |  | $ | 194.2 |  |  | $ | 1.8 |  |  | $ | 4.2 |  |  | $ | — |  |  | $ | 5.0 |  |  | $ | 3.8 |  |  |  |  |  |  | $ | 209.0 |
Information by security type pertaining to the changes in the fair value of the Company’s investments classified as Level 3 for the year ended December 31, 2023 is presented below.
(Dollars in Millions) |  | Fixed Maturities | Equity Securities |  | Total
Corporate Bonds and Notes |  | States and Political Sub-divisions |  | Redeemable Preferred Stocks |  |  |  | Other Mortgage- and Asset- backed | Preferred and Common Stocks |
Balance, Beginning of Year |  | $ | 216.0 |  |  | $ | — |  |  | $ | 6.8 |  |  |  |  | $ | 5.1 |  | $ | 2.1 |  |  | $ | 230.0 |
Total Gains (Losses): |  |  |  |  |  |  |  |  |  |  |  |  |
Included in Consolidated Statements of Income (Loss) |  | (0.7) |  |  | — |  |  | — |  |  |  |  | — |  | (0.8) |  |  | (1.5) |
Included in Other Comprehensive Income |  | 6.4 |  |  | — |  |  | 0.3 |  |  |  |  | 0.1 |  | — |  |  | 6.8 |
Purchases |  | 50.4 |  |  | 0.1 |  |  | — |  |  |  |  | — |  | 1.1 |  |  | 51.6 |
Sales |  | (102.6) |  |  | — |  |  | — |  |  |  |  | — |  | — |  |  | (102.6) |
Transfers into Level 3 |  | 7.7 |  |  | — |  |  | — |  |  |  |  | — |  | 0.4 |  |  | 8.1 |
Transfers out of Level 3 |  | (0.1) |  |  | — |  |  | — |  |  |  |  | — |  | — |  |  | (0.1) |
Balance, End of Year |  | $ | 177.1 |  |  | $ | 0.1 |  |  | $ | 7.1 |  |  |  |  | $ | 5.2 |  | $ | 2.8 |  |  | $ | 192.3 |
Fair Value, by Balance Sheet Grouping | Presented below are the carrying values and fair value estimates of financial instruments not carried at fair value.
|  |  | December 31, 2024 |  | December 31, 2023
(Dollars in Millions) | Level |  | Carrying Value |  | Fair Value |  | Carrying Value |  | Fair Value
Financial Assets: |  |  |  |  |  |  |  |  |
Loans to Policyholders | Level 3 |  | $ | 280.7 |  |  | $ | 280.7 |  |  | $ | 281.2 |  |  | $ | 281.2 |
Short-term Investments | Level 1 or 2 |  | 1,037.1 |  |  | 1,037.1 |  |  | 520.9 |  |  | 520.9 |
Mortgage Loans | Level 3 |  | 75.3 |  |  | 75.3 |  |  | 99.8 |  |  | 99.8 |
Company-Owned Life Insurance | Level 2 |  | 539.2 |  | 539.2 |  | 513.5 |  | 513.5
Equity Securities at Modified Cost | Level 3 |  | 22.5 |  | 22.5 |  | 32.6 |  | 32.6
Financial Liabilities: |  |  |  |  |  |  |  |  |
Long-term Debt | Level 2 |  | $ | 1,391.6 |  |  | $ | 1,278.4 |  |  | $ | 1,389.2 |  |  | $ | 1,213.4 |
Policyholder Obligations | Level 2 |  | 541.3 |  |  | 541.3 |  |  | 557.4 |  |  | 557.4 |
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 December 31, 2024 and 2023, respectively.
(Dollars in Millions) |  | December 31, 2024 |  | December 31, 2023
Asset Class |  | Fair Value Using NAV |  | Unfunded Commitments |  | Fair Value Using NAV |  | Unfunded Commitments
Reported as Equity Method Limited Liability Investments: |  |  |  |  |  |  |  |
Mezzanine Debt |  | $ | 116.7 |  |  | $ | 40.8 |  |  | $ | 125.4 |  |  | $ | 43.1 |
Real Estate |  | 27.3 |  |  | — |  |  | 41.9 |  |  | — |
Senior Debt |  | 19.1 |  |  | 48.2 |  |  | 19.0 |  |  | 39.9 |
Leveraged Buyout |  | 7.5 |  |  | 0.6 |  |  | 8.6 |  |  | 0.6 |
Secondary Transactions |  | 5.5 |  |  | 1.6 |  |  | 7.9 |  |  | 1.7 |
Distressed Debt |  | 4.4 |  |  | — |  |  | 7.9 |  |  | — |
Hedge Fund |  | 0.1 |  |  | — |  |  | 0.1 |  |  | — |
Growth Equity |  | — |  |  | — |  |  | 1.2 |  |  | — |
Other |  | 5.7 |  |  | 0.1 |  |  | 9.7 |  |  | — |
Total Equity Method Limited Liability Investments |  | 186.3 |  |  | 91.3 |  |  | 221.7 |  |  | 85.3 |
Reported as Other Equity Interests at Fair Value: |  |  |  |  |  |  |  |
Mezzanine Debt |  | 116.9 |  |  | 67.0 |  |  | 124.0 |  |  | 67.0 |
Senior Debt |  | 26.3 |  |  | 8.4 |  |  | 24.8 |  |  | 10.6 |
Leveraged Buyout |  | 19.2 |  |  | 30.4 |  |  | 19.0 |  |  | 10.0 |
Distressed Debt |  | 11.7 |  |  | 15.0 |  |  | 12.4 |  |  | 13.0 |
Growth Equity |  | 7.0 |  |  | 8.0 |  |  | 6.4 |  |  | 6.5 |
Secondary Transactions |  | 2.4 |  |  | 1.6 |  |  | 2.8 |  |  | 3.1 |
Hedge Funds |  | — |  |  | — |  |  | 1.9 |  |  | — |
Other |  | 0.1 |  |  | 0.2 |  |  | 0.1 |  |  | 0.2 |
Total Reported as Other Equity Interests at Fair Value |  | 183.6 |  |  | 130.6 |  |  | 191.4 |  |  | 110.4 |
Reported as Equity Securities at Modified Cost: |  |  |  |  |  |  |  |
Other |  | 1.8 |  |  | — |  |  | 4.8 |  |  | — |
Total Reported as Equity Securities at Modified Cost |  | 1.8 |  |  | — |  |  | 4.8 |  |  | — |
Total Investments in Limited Liability Companies and Limited Partnerships |  | $ | 371.7 |  |  | $ | 221.9 |  |  | $ | 417.9 |  |  | $ | 195.7 |
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 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 (“IPO”) 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.

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- Definition Tabular disclosure of the investment holdings which are represented by other than securities (for example, commodities). The investment holdings, other than securities investments table lists the long positions of non-security investments held by entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 5D -Subparagraph (SX 210.12-13D) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-5D + Details
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