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Fair Value Measurements
 6 Months Ended
Jun. 30, 2023
Fair Value Disclosures [Abstract]  
Fair Value Measurements Fair Value MeasurementsThe Company classifies its Investments in Fixed Maturities as available-for-sale and reports these investments at fair value. The Company reports equity investments with readily determinable fair values as Equity Securities at Fair Value. Certain investments that are measured at fair value using the net asset value practical expedient are not required to be classified using the fair value hierarchy, but are presented in the following two tables to permit reconciliation of the fair value hierarchy to the amounts presented in the Condensed Consolidated Balance Sheets.
Note 11 - Fair Value Measurements (Continued)
The valuation of assets and liabilities measured at fair value in Company’s Condensed Consolidated Balance Sheets at June 30, 2023 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 ValueTotal Fair Value
Assets:
Fixed Maturities:
U.S. Government and Government Agencies and Authorities$120.0 $425.5 $— $— $545.5 
States and Political Subdivisions— 1,461.0 — — 1,461.0 
Foreign Governments— 4.0 — — 4.0 
Corporate Securities:
Bonds and Notes— 3,446.0 187.4 — 3,633.4 
Redeemable Preferred Stock— 1.2 6.7 — 7.9 
Collateralized Loan Obligations— 987.2 — — 987.2 
Other Mortgage and Asset-backed— 299.6 5.2 — 304.8 
Total Investments in Fixed Maturities 120.0 6,624.5 199.3 — 6,943.8 
Equity Securities at Fair Value:
Preferred Stocks:
Finance, Insurance and Real Estate— 30.0 — — 30.0 
Other Industries— 9.5 1.8 — 11.3 
Common Stocks:
Finance, Insurance and Real Estate0.6 — — — 0.6 
Other Industries0.4 — 0.4 — 0.8 
Other Equity Interests:
Exchange Traded Funds7.3 — — — 7.3 
Limited Liability Companies and Limited Partnerships— — — 197.0 197.0 
Total Investments in Equity Securities at Fair Value8.3 39.5 2.2 197.0 247.0 
Other Investments:
Convertible Securities at Fair Value— 46.2 — — 46.2 
Other Assets:
Derivative Instrument Not Designated as Hedges— 3.2 — — 3.2 
Total Assets$128.3 $6,713.4 $201.5 $197.0 $7,240.2 
At June 30, 2023, the Company had unfunded commitments to invest an additional $110.7 million in certain limited liability investment companies and limited partnerships that will be included in Other Equity Interests if funded.
Note 11 - Fair Value Measurements (Continued)
The valuation of assets measured at fair value in the Company’s Consolidated Balance Sheets at December 31, 2022 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$103.6 $424.4 $— $— $528.0 
States and Political Subdivisions— 1,568.9 — — 1,568.9 
Foreign Governments— 4.1 — — 4.1 
Corporate Securities:
Bonds and Notes— 3,323.4 216.0 — 3,539.4 
Redeemable Preferred Stocks— 1.2 6.8 — 8.0 
Collateralized Loan Obligations— 953.9 — — 953.9 
Other Mortgage and Asset-backed— 287.4 5.1 — 292.5 
Total Investments in Fixed Maturities103.6 6,563.3 227.9 — 6,894.8 
Equity Securities at Fair Value:
Preferred Stocks:
Finance, Insurance and Real Estate— 29.0 — — 29.0 
Other Industries— 9.2 1.6 — 10.8 
Common Stocks:
Finance, Insurance and Real Estate0.9 — — — 0.9 
Other Industries0.3 0.4 0.5 — 1.2 
Other Equity Interests:
Exchange Traded Funds12.2 — — — 12.2 
Limited Liability Companies and Limited Partnerships— — — 189.1 189.1 
Total Investments in Equity Securities at Fair Value13.4 38.6 2.1 189.1 243.2 
Other Investments:
Convertible Securities at Fair Value— 43.3 — — 43.3 
Other Assets:
Derivative Instruments Not Designated as Hedges— 1.7 — — 1.7 
Total Assets$117.0 $6,646.9 $230.0 $189.1 $7,183.0 
Liabilities:
Accrued Expenses and Other Liabilities:
Derivative Instruments Designated as Fair Value Hedges$— $(0.4)$— $— $(0.4)
Total Liabilities$— $(0.4)$— $— $(0.4)
Note 11 - Fair Value Measurements (Continued)
The Company’s investments in Fixed Maturities that are classified as Level 1 primarily consist of U.S. Treasury Bonds and Notes. The Company’s investments in Equity Securities at Fair Value that are classified as Level 1 consist of either investments in publicly-traded common stocks or exchange traded funds. The Company’s investments in Fixed Maturities that are classified as Level 2 primarily consist of investments in corporate bonds, obligations of states and political subdivisions, collateralized loan obligations, and mortgage-backed securities of U.S. government agencies. The Company’s investments in Equity Securities at Fair Value that are classified as Level 2 primarily consist of investments in preferred stocks. The Company’s Derivative Instruments Designated as Fair Value Hedges that are classified as Level 2 primarily consist of hedges against the Company’s available for sale debt securities portfolio. The Company uses a leading, nationally recognized provider of market data and analytics to price the vast majority of the Company’s Level 2 measurements. The provider utilizes evaluated pricing models that vary by asset class and incorporate available trade, bid and other market information. Because many fixed maturity securities do not trade on a daily basis, the provider’s evaluated pricing applications apply available information through processes such as benchmark curves, benchmarking of like securities, sector groupings and matrix pricing to prepare evaluations. In addition, the provider uses model processes to develop prepayment and interest rate scenarios. The pricing provider’s models and processes also take into account market convention. For each asset class, teams of its evaluators gather information from market sources and integrate relevant credit information, perceived market movements and sector news into the evaluated pricing applications and models. The Company generally validates the measurements obtained from its primary pricing provider by comparing them with measurements obtained from one additional pricing provider that provides either prices from recent market transactions, quotes in inactive markets or evaluations based on its own proprietary models.
The Company investigates significant differences related to the values provided. On completion of its investigation, management exercises judgment to determine the price selected and whether adjustments, if any, to the price obtained from the Company’s primary pricing provider would warrant classification of the price as Level 3. In instances where a measurement cannot be obtained from either pricing provider, the Company generally will evaluate bid prices from one or more binding quotes obtained from market makers to value investments in inactive markets and classified by the Company as Level 2. The Company generally classifies securities when it receives non-binding quotes or indications as Level 3 securities unless the Company can validate the quote or indication against recent transactions in the market.
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 June 30, 2023.
(Dollars in Millions)Unobservable InputTotal Fair ValueRange of Unobservable InputsWeighted-average Yield
Investment-gradeMarket Yield$57.4 4.2 %-14.3 %10.0 %
Non-investment-grade:
Senior DebtMarket Yield47.8 6.3 -39.9 15.3 
Junior DebtMarket Yield33.2 6.3 -22.5 19.4 
OtherVarious60.9 
Total Level 3 Fixed Maturity Investments$199.3 
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, 2022.
(Dollars in Millions)Unobservable InputTotal Fair ValueRange of Unobservable InputsWeighted-average Yield
Investment-gradeMarket Yield$56.5 4.6 %-14.5 %9.2 %
Non-investment-grade:
Senior DebtMarket Yield72.9 4.6 -36.7 10.9 
Junior DebtMarket Yield42.1 8.8 -22.5 15.1 
OtherVarious56.4 
Total Level 3 Fixed Maturity Investments$227.9 
Note 11 - Fair Value Measurements (Continued)
For an investment in a fixed maturity security, an increase in the yield used to determine the fair value of the security will decrease the fair value of the security. A decrease in the yield used to determine fair value will increase the fair value of the security, but for callable securities the fair value increase is generally limited to par, unless security is currently callable at a premium.
Information by security type pertaining to the changes in the fair value of the Company’s investments classified as Level 3 for the six months ended June 30, 2023 is presented below.
 Fixed MaturitiesEquity Securities
(Dollars in Millions)Corporate
Bonds
and Notes		Redeemable
Preferred
Stocks		Other Mortgage-
and Asset-
backed		Preferred
and 
Common
Stocks		Total
Balance at Beginning of Year$216.0 $6.8 $5.1 $2.1 $230.0 
Total Gains (Losses):
Included in Condensed Consolidated Statements of Loss0.5 — — (1.4)(0.9)
Included in Other Comprehensive Income
2.4 (0.1)0.1 — 2.4 
Purchases37.9 — — 1.1 39.0 
Settlements— — — — — 
Sales(69.3)— — — (69.3)
Transfers into Level 3— — — 0.4 0.4 
Transfers out of Level 3(0.1)— — — (0.1)
Balance at End of Period$187.4 $6.7 $5.2 $2.2 $201.5 
The transfers into and out of Level 3 were due primarily to changes in the availability of market observable inputs.
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 June 30, 2023 is presented below.
 Fixed MaturitiesEquity Securities
(Dollars in Millions)Corporate
Bonds
and Notes		Redeemable
Preferred
Stocks		Other Mortgage-
and Asset-
backed		Preferred
and 
Common
Stocks		Total
Balance at Beginning of Period$196.1 $6.8 $5.3 $2.0 $210.2 
Total Gains (Losses):
Included in Condensed Consolidated Statements of Loss0.1 — — (0.9)(0.8)
Included in Other Comprehensive Loss
0.9 (0.1)(0.1)— 0.7 
Purchases18.5 — — 1.1 19.6 
Settlements— — — — — 
Sales(28.1)— — — (28.1)
Transfers into Level 3— — — — — 
Transfers out of Level 3(0.1)— — — (0.1)
Balance at End of Period$187.4 $6.7 $5.2 $2.2 $201.5 
The transfers into and out of Level 3 were due to changes in the availability of market observable inputs.
Note 11 - Fair Value Measurements (Continued)
Information by security type pertaining to the changes in the fair value of the Company’s investments classified as Level 3 for the six months ended June 30, 2022 is presented below.
 Fixed MaturitiesEquity Securities
(Dollars in Millions)Corporate
Bonds
and Notes		Redeemable
Preferred
Stocks		Other Mortgage-
and Asset-
backed		Preferred
and 
Common
Stocks		Total
Balance at Beginning of Year$236.8 $6.1 $7.0 $1.5 $251.4 
Total (Losses) Gains:
Included in Condensed Consolidated Statements of Loss(5.9)— — — (5.9)
Included in Other Comprehensive Loss
(9.4)(1.2)(1.4)0.2 (11.8)
Purchases21.6 2.0 — — 23.6 
Settlements— — — — — 
Sales(65.6)— — — (65.6)
Transfers into Level 35.3 — — — 5.3 
Transfers out of Level 3(5.7)— — — (5.7)
Balance at End of Period$177.1 $6.9 $5.6 $1.7 $191.3 
The transfers into and out of Level 3 were due to changes in the availability of market observable inputs.
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 June 30, 2022 is presented below.
 Fixed MaturitiesEquity Securities
(Dollars in Millions)Corporate
Bonds
and Notes		Redeemable
Preferred
Stocks		Other Mortgage-
and Asset-
backed		Preferred
and 
Common
Stocks		Total
Balance at Beginning of Period$205.6 $5.6 $6.2 $1.5 $218.9 
Total (Losses) Gains:
Included in Condensed Consolidated Statements of Loss(0.2)— — — (0.2)
Included in Other Comprehensive Loss
(7.7)(0.7)(0.6)0.2 (8.8)
Purchases7.9 2.0 — — 9.9 
Settlements— — — — — 
Sales(22.8)— — — (22.8)
Transfers into Level 3— — — — — 
Transfers out of Level 3(5.7)— — — (5.7)
Balance at End of Period$177.1 $6.9 $5.6 $1.7 $191.3 
Note 11 - Fair Value Measurements (Continued)
The table below shows investments reported at fair value using NAV and their unfunded commitments by asset class as of June 30, 2023 and December 31, 2022.
June 30, 2023December 31, 2022
Asset ClassFair Value Using NAVUnfunded CommitmentsFair Value Using NAVUnfunded Commitments
Reported as Equity Method Limited Liability Investments at Cost Plus Cumulative Undistributed Earnings:
Mezzanine Debt$125.6 $47.0 $114.3 $51.6 
Senior Debt21.8 41.1 21.6 42.0 
Distressed Debt8.1 — 9.4 — 
Secondary Transactions8.5 1.7 9.3 1.7 
Hedge Fund0.1 — 0.5 — 
Leveraged Buyout9.7 0.7 8.9 0.6 
Growth Equity1.2 — 1.2 — 
Real Estate41.5 — 43.3 — 
Other8.6 — 8.5 — 
Total Equity Method Limited Liability Investments225.1 90.5 217.0 95.9 
Alternative Energy Partnership Investments16.8 — 16.3 — 
Reported as Other Equity Interests at Fair Value:
Mezzanine Debt115.8 66.2 106.0 56.0 
Senior Debt22.4 13.4 21.9 6.0 
Distressed Debt12.5 13.3 12.5 13.0 
Secondary Transactions2.8 3.1 3.5 4.2 
Hedge Funds14.9 — 18.1 — 
Leveraged Buyout22.5 7.8 21.6 9.0 
Growth Equity6.0 6.7 5.4 7.9 
Real Estate0.1 0.2 — — 
Other— — 0.1 0.2 
Total Reported as Other Equity Interests at Fair Value197.0 110.7 189.1 96.3 
Reported as Equity Securities at Modified Cost:
Other6.0 — 8.3 — 
Total Reported as Equity Securities at Modified Cost6.0 — 8.3 — 
Total Investments in Limited Liability Companies and Limited Partnerships$444.9 $201.2 $430.7 $192.2 
At June 30, 2023, the Company had unfunded commitments to invest an additional $201.2 million in certain limited liability investment companies and limited partnerships that will be included in Other Equity Interests and Equity Method Limited Liability Investments if funded.
Note 11 - Fair Value Measurements (Continued)
The fund investments included above (excluding Hedge Funds) are not redeemable, because distributions from the funds will be received when underlying investments of the funds are liquidated. The funds are generally expected to have approximately 10 year lives at their inception, but these lives may be extended at the fund manager’s discretion, typically in one or two-year increments.
The hedge fund investments included above, which are carried at fair value, are generally redeemable subject to the redemption notices period. The majority of the hedge fund investments are redeemable monthly or quarterly.
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 ClassInvestment Category Includes
Mezzanine DebtFunds with investments in junior or subordinated debt and potentially minority equity securities issued by private companies.
Senior DebtFunds with investments in senior or first lien debt and potentially minority equity securities typically issued by private companies.
Distressed DebtFunds 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 TransactionsFunds that focus on purchasing third party fund interests from investors seeking liquidity within their own portfolio.
Hedge FundFunds that focus primarily on investing in public securities with strategy of generating uncorrelated returns to the public markets.
Leveraged BuyoutFunds with control equity investments in more mature, positive cash flowing, private companies that are typically purchased with the use of financial leverage.
Growth EquityFunds 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 EstateFunds with investments in multi-family housing properties.
OtherConsists of direct investments of preferred equity or minority common equity investments into private companies structured as limited partnerships or limited liability companies.
Presented below are the carrying values and fair value estimates of financial instruments not carried at fair value.
 June 30, 2023December 31, 2022
(Dollars in Millions)Carrying ValueFair ValueCarrying ValueFair Value
Financial Assets:
Loans to Policyholders $281.6 $281.6 $283.4 $283.4 
Short-term Investments406.3 406.3 278.4 278.4 
Mortgage Loans92.6 92.6 91.1 91.1 
Company-Owned Life Insurance500.5 500.5 586.5 586.5 
Equity Securities at Modified Cost34.7 34.7 38.4 38.4 
Financial Liabilities:
Long-term Debt$1,388.1 $1,183.5 $1,386.9 $1,195.1 
Policyholder Obligations601.0 601.0 601.0 601.0 
Note 11 - Fair Value Measurements (Continued)Loans to policyholders are carried at unpaid principal balance which approximates fair value and are categorized as Level 3 within the fair value hierarchy. The nature of policy loans is to have a negligible default risk as the loans are fully collateralized by the value of the policy. Policy loans do not have a stated maturity and the balances and accrued interest are repaid either by the policyholder or with proceeds from the policy. Due to the collateralized nature of policy loans and unpredictable timing of payments, the Company believes the carrying value of policy loans approximates fair value. The fair value measurement of Short-term Investments is estimated using inputs that are considered either Level 1 or Level 2 measurements. The Mortgage Loans fair value measurement is considered equal to amortized cost given the short-term nature of the investments. The fair value measurement of Equity Securities at Modified Cost is estimated using inputs that are considered Level 3 measurements. The cash surrender value of Company-Owned Life Insurance approximates fair value and is considered to be a Level 2 investment. The fair value of Long-term Debt is estimated using quoted prices for similar liabilities in markets that are not active. The inputs used in the valuation are considered Level 2 measurements. Policyholder Obligations presented in the