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Pension Benefits (Tables) - Pension Plans, Defined Benefit
 12 Months Ended
Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Changes in Fair Value of Plan Assets
Changes in Fair Value of Plan Assets and Changes in Projected Benefit Obligation for the Pension Plan for the years ended December 31, 2023 and 2022 is presented below.
DOLLARS IN MILLIONS20232022
Fair Value of Plan Assets at Beginning of Year$315.8 $391.7 
Actual Return on Plan Assets7.1 (65.1)
Benefits Paid(100.9)(13.7)
Settlement Benefits(205.7)2.9 
Fair Value of Plan Assets at End of Year16.3 315.8 
Projected Benefit Obligation at Beginning of Year292.2 378.8 
Interest Cost8.4 8.7 
Benefits Paid(100.9)(13.7)
Settlement Benefits(205.7)2.9 
Actuarial Gains6.0 (84.5)
Projected Benefit Obligation at End of Year— 292.2 
Funded Status—Plan Assets in Excess of Projected Benefit Obligation$16.3 $23.6 
Unamortized Amount Reported in AOCI at End of Year$— $(63.1)
Accumulated Benefit Obligation at End of Year$— $289.3 
Schedule of Assumptions Used
The weighted-average discount rate and rate of increase in future compensation levels used to estimate the components of the Projected Benefit Obligation for the Pension Plan at December 31, 2022 were:
2022
Discount Rate5.05 %
Rate of Increase in Future Compensation Levels— 
The weighted-average discount rate, service cost discount rate, interest cost discount rate, rate of increase in future compensation levels and expected long-term rate of return on plan assets used to develop the components of Pension Expense for the Pension Plan for the years ended December 31, 2023, 2022 and 2021 were:
202320222021
Weighted-average Discount Rate5.05 %2.89 %2.56 %
Service Cost Discount RateN/AN/A2.41 
Interest Cost Discount Rate4.92 2.35 1.90 
Rate of Increase in Future Compensation LevelsN/A3.40 3.40 
Expected Long Term Rate of Return on Plan Assets3.79 2.08 2.70 
Schedule of Allocation of Plan Assets
Asset allocations for the Pension Plan at December 31, 2023 and 2022 by asset category were:
ASSET CATEGORY20232022
Corporate Bonds and Notes— %27 %
Bond Exchange Traded Funds— 35 
Cash and Short-term Investments100 37 
Other Assets— 1 
Total100 %100 %
Fair Value, Measurement Inputs, Disclosure
Fair value measurements for the Pension Plan’s assets at December 31, 2022 are summarized below.
DOLLARS IN MILLIONSQuoted Prices
in Active Markets
for Identical
Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)		Measured at Net Asset ValueFair Value
Fixed Maturities:
U.S. Government and Government Agencies and Authorities
$40.1 $— $— $— $40.1 
States and Political Subdivisions
— 0.1 — — 0.1 
Foreign Governments— 0.4 — — 0.4 
Corporate Bonds and Notes
— 45.4 — — 45.4 
Equity Securities:
Other Equity Interests:
Bond Exchange Traded Funds
111.1 — — — 111.1 
Limited Liability Companies and Limited Partnerships
— — — 1.8 1.8 
Short-term Investments116.1 — — — 116.1 
Receivables and Other0.8 — — — 0.8 
Total$268.1 $45.9 $— $1.8 $315.8 
Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss)
The components of Comprehensive Pension (Income) Expense for the Pension Plan for the years ended December 31, 2023, 2022 and 2021 were:
DOLLARS IN MILLIONS202320222021
Service Cost Earned During the Year$— $— $— 
Interest Cost on Projected Benefit Obligation8.4 8.7 7.2 
Expected Return on Plan Assets(7.9)(7.4)(9.5)
Amortization of Prior Service Cost0.4 0.7 — 
Amortization of Actuarial Loss— 1.8 2.9 
Settlement Expense70.2 — — 
Pension Expense Recognized in Consolidated Statements of (Loss) Income71.1 3.8 0.6 
Unrecognized Pension Loss Arising During the Year— (12.0)(6.0)
Prior Service Cost Arising During the Year— — 18.3 
Amortization of Prior Service Cost— (0.7)— 
Amortization of Accumulated Unrecognized Pension Loss— (1.8)(2.9)
Comprehensive Pension (Income) Expense $71.1 $(10.7)$10.0