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Pension Benefits (Tables) - Pension Plans, Defined Benefit
 12 Months Ended
Dec. 31, 2021
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, 2021 and 2020 is presented below.
DOLLARS IN MILLIONS20212020
Fair Value of Plan Assets at Beginning of Year$405.4 $664.6 
Actual Return on Plan Assets(0.7)92.1 
Employer Contributions— — 
Benefits Paid(13.0)(145.9)
Settlement Benefits— (205.4)
Fair Value of Plan Assets at End of Year391.7 405.4 
Projected Benefit Obligation at Beginning of Year382.3 660.5 
Interest Cost7.2 16.5 
Benefits Paid(13.0)(145.9)
Settlement Benefits— (205.4)
Plan Amendments18.3 — 
Actuarial (Gains) Losses(16.0)56.6 
Projected Benefit Obligation at End of Year378.8 382.3 
Funded Status—Plan Assets in Excess (Deficit) of Projected Benefit Obligation$12.9 $23.1 
Unamortized Amount Reported in AOCI at End of Year$(77.6)$(68.2)
Accumulated Benefit Obligation at End of Year$378.8 $382.3 
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, 2021 and 2020 were:
20212020
Discount Rate2.89 %2.56 %
Rate of Increase in Future Compensation Levels3.40 3.40 
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, 2021, 2020 and 2019 were:
202120202019
Weighted-average Discount Rate2.56 %2.56 %4.28 %
Service Cost Discount Rate2.41 2.42 4.26 
Interest Cost Discount Rate1.90 1.89 3.91 
Rate of Increase in Future Compensation Levels3.40 3.40 3.40 
Expected Long Term Rate of Return on Plan Assets2.70 4.90 5.70 
Schedule of Allocation of Plan Assets
Asset allocations for the Pension Plan at December 31, 2021 and 2020 by asset category were:
ASSET CATEGORY20212020
Corporate Bonds and Notes30 %37 %
Common and Preferred Stocks— 24 
Bond Exchange Traded Funds32 27 
Cash and Short-term Investments36 2 
Other Assets2 10 
Total100 %100 %
Fair Value, Measurement Inputs, Disclosure Fair value measurements for the Pension Plan’s assets at December 31, 2021 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
$54.6 $— $— $— $54.6 
States and Political Subdivisions
— 0.1 — — 0.1 
Foreign Governments— 0.6 — — 0.6 
Corporate Bonds and Notes
— 62.3 — — 62.3 
Equity Securities:
Other Equity Interests:
Bond Exchange Traded Funds
125.0 — — — 125.0 
Limited Liability Companies and Limited Partnerships
— — — 8.4 8.4 
Short-term Investments140.2 — — — 140.2 
Receivables and Other0.5 — — — 0.5 
Total$320.3 $63.0 $— $8.4 $391.7 
Fair value measurements for the Pension Plan’s assets at December 31, 2020 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
$68.3 $— $— $— $68.3 
States and Political Subdivisions
— 0.7 — — 0.7 
Corporate Bonds and Notes
— 81.3 — — 81.3 
Equity Securities:
Common Stocks:
Other Industries
64.8 — — — 64.8 
Other Equity Interests:
Collective Investment Funds
— — — 32.1 32.1 
Bond Exchange Traded Funds
108.6 — — — 108.6 
Limited Liability Companies and Limited Partnerships
— — — 41.6 41.6 
Short-term Investments7.4 — — — 7.4 
Receivables and Other0.6 — — — 0.6 
Total$249.7 $82.0 $— $73.7 $405.4 
Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss)
The components of Comprehensive Pension Expense (Income) for the Pension Plan for the years ended December 31, 2021, 2020 and 2019 were:
DOLLARS IN MILLIONS202120202019
Service Cost Earned During the Year$— $— $— 
Interest Cost on Projected Benefit Obligation7.2 16.5 22.3 
Expected Return on Plan Assets(9.5)(27.6)(30.6)
Amortization of Actuarial Loss2.9 5.6 2.9 
Settlement Expense— 64.1 — 
Pension Expense (Income) Recognized in Consolidated Statements of Income0.6 58.6 (5.4)
Unrecognized Pension Gain (Loss) Arising During the Year(6.0)(7.8)4.2 
Prior Service Credit Arising During the Year18.3 — — 
Amortization of Accumulated Unrecognized Pension Loss(2.9)(69.8)(2.9)
Comprehensive Pension Expense (Income)$10.0 $(19.0)$(4.1)
Schedule of Expected Benefit Payments
The following benefit payments (net of participant contributions), which consider expected future service of certain participants that remain eligible for a benefit accrual, as appropriate, are expected to be paid from the Pension Plan:
DOLLARS IN MILLIONSYears Ending December 31,
202220232024202520262027-2031
Estimated Pension Benefit Payments$17.0 $16.5 $17.3 $18.1 $18.7 $97.9 
Significant Unobservable Inputs (Level 3)  
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Changes in Fair Value of Plan Assets