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Investments (Tables)
 9 Months Ended
Sep. 30, 2023
Debt Securities, Available-for-sale [Line Items]  
Investments Classified by Contractual Maturity Date
The amortized cost and fair values of the Company’s Investments in Fixed Maturities at September 30, 2023 by contractual maturity were:
(Dollars in Millions)Amortized CostFair Value
Due in One Year or Less$170.8 $161.3 
Due after One Year to Five Years915.2 872.0 
Due after Five Years to Ten Years1,089.5 906.1 
Due after Ten Years3,625.5 2,898.1 
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date1,821.5 1,637.0 
Investments in Fixed Maturities $7,622.5 $6,474.5 
Schedule of Unrealized Loss on Investments
An aging of unrealized losses on the Company’s Investments in Fixed Maturities at September 30, 2023 is presented below.
 Less Than 12 Months12 Months or LongerTotal
(Dollars in Millions)Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses
Fixed Maturities:
U.S. Government and Government Agencies and Authorities$93.4 $(4.1)$381.9 $(108.6)$475.3 $(112.7)
States and Political Subdivisions374.3 (22.0)873.5 (272.7)1,247.8 (294.7)
Foreign Governments0.1 — 2.4 (0.9)2.5 (0.9)
Corporate Securities:
Bonds and Notes608.6 (54.1)2,638.0 (597.5)3,246.6 (651.6)
Redeemable Preferred Stocks— — 7.4 (1.3)7.4 (1.3)
Collateralized Loan Obligations21.9 (0.3)776.2 (29.8)798.1 (30.1)
Other Mortgage- and Asset-backed25.3 (0.4)276.5 (57.3)301.8 (57.7)
Total Fixed Maturities$1,123.6 $(80.9)$4,955.9 $(1,068.1)$6,079.5 $(1,149.0)
    
An aging of unrealized losses on the Company’s Investments in Fixed Maturities at December 31, 2022 is presented below.
 Less Than 12 Months12 Months or LongerTotal
(Dollars in Millions)Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses
Fixed Maturities:
U.S. Government and Government Agencies and Authorities$337.3 $(49.3)$126.5 $(36.5)$463.8 $(85.8)
States and Political Subdivisions854.7 (140.6)276.8 (97.7)1,131.5 (238.3)
Foreign Governments0.1 — 2.6 (0.9)2.7 (0.9)
Corporate Securities:
Bonds and Notes2,730.6 (373.9)424.4 (125.8)3,155.0 (499.7)
Redeemable Preferred Stocks7.7 (1.0)— — 7.7 (1.0)
Collateralized Loan Obligations568.2 (34.2)373.9 (26.6)942.1 (60.8)
Other Mortgage- and Asset-backed205.4 (28.9)79.5 (21.4)284.9 (50.3)
Total Fixed Maturities$4,704.0 $(627.9)$1,283.7 $(308.9)$5,987.7 $(936.8)
Schedule of Other Investments
The carrying values of the Company’s Other Investments at September 30, 2023 and December 31, 2022 were:
(Dollars in Millions)Sep 30,
2023		Dec 31,
2022
Equity Securities at Modified Cost
$33.1 $38.4 
Convertible Securities at Fair Value
45.9 43.3 
Real Estate at Depreciated Cost95.4 93.6 
Mortgage Loans98.5 91.1 
Other0.2 3.5 
Total$273.1 $269.9 
Investment Income
Net Investment Income for the nine and three months ended September 30, 2023 and 2022 was:
 Nine Months EndedThree Months Ended
(Dollars in Millions)Sep 30,
2023		Sep 30,
2022		Sep 30,
2023		Sep 30,
2022
Investment Income:
Interest on Fixed Income Securities$259.8 $218.4 $86.5 $76.9 
Dividends on Equity Securities Excluding Alternative Investments3.4 4.3 1.2 1.1 
Alternative Investments:
Equity Method Limited Liability Investments8.2 28.0 4.3 (0.6)
Limited Liability Investments Included in Equity Securities14.3 34.9 5.4 8.8 
Total Alternative Investments22.5 62.9 9.7 8.2 
Short-term Investments11.9 1.4 6.0 1.1 
Loans to Policyholders15.6 16.3 5.1 5.5 
Real Estate6.6 7.6 2.3 3.1 
Company-Owned Life Insurance22.6 28.0 6.4 9.9 
Other10.1 5.1 1.8 1.7 
Total Investment Income 352.5 344.0 119.0 107.5 
Investment Expenses:
Real Estate6.0 5.8 1.7 2.3 
Other Investment Expenses31.4 21.9 10.3 7.4 
Total Investment Expenses37.4 27.7 12.0 9.7 
Net Investment Income$315.1 $316.3 $107.0 $97.8 
Schedule of Realized Gain (Loss)
Gross gains and losses on sales of investments in fixed maturities and gains and losses associated with Ultra-Long Treasury Futures for the nine and three months ended September 30, 2023 and 2022 were:
 Nine Months EndedThree Months Ended
(Dollars in Millions)Sep 30,
2023		Sep 30,
2022		Sep 30,
2023		Sep 30,
2022
Fixed Maturities:
Gains on Sales$2.3 $28.0 $0.8 $14.2 
Losses on Sales(10.5)(27.5)(1.2)(23.9)
(Losses) Gains on Hedging Activity(29.7)— (29.4)(0.3)
Investments in Fixed Maturities  
Debt Securities, Available-for-sale [Line Items]  
Schedule of Available-for-sale Securities Reconciliation
The amortized cost and fair values of the Company’s Investments in Fixed Maturities at September 30, 2023 were:
 Amortized
Cost		Gross UnrealizedAllowance for Expected Credit LossesFair Value
(Dollars in Millions)GainsLosses
U.S. Government and Government Agencies and Authorities$599.7 $0.2 $(112.7)$— $487.2 
States and Political Subdivisions1,613.9 1.5 (294.7)(0.5)1,320.2 
Foreign Governments5.1 — (0.9)— 4.2 
Corporate Securities:
Bonds and Notes4,047.3 6.8 (651.6)(8.1)3,394.4 
Redeemable Preferred Stocks9.0 0.1 (1.3)— 7.8 
Collateralized Loan Obligations985.4 0.9 (30.1)— 956.2 
Other Mortgage- and Asset-backed362.1 0.1 (57.7)— 304.5 
Investments in Fixed Maturities$7,622.5 $9.6 $(1,149.0)$(8.6)$6,474.5 
The amortized cost and fair values of the Company’s Investments in Fixed Maturities at December 31, 2022 were:
 Amortized
Cost		Gross UnrealizedAllowance for Expected Credit LossesFair Value
(Dollars in Millions)GainsLosses
U.S. Government and Government Agencies and Authorities$612.5 $1.3 $(85.8)$— $528.0 
States and Political Subdivisions1,797.6 10.3 (238.3)(0.7)1,568.9 
Foreign Governments5.0 — (0.9)— 4.1 
Corporate Securities:
Bonds and Notes4,030.3 17.7 (499.7)(8.9)3,539.4 
Redeemable Preferred Stocks9.0 — (1.0)— 8.0 
Collateralized Loan Obligations1,014.7 — (60.8)— 953.9 
Other Mortgage- and Asset-backed342.7 0.1 (50.3)— 292.5 
Investments in Fixed Maturities$7,811.8 $29.4 $(936.8)$(9.6)$6,894.8