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Postretirement Benefits Other Than Pensions (Tables) - Other Postretirement Benefit Plan, Defined Benefit | 12 Months Ended
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Dec. 31, 2024
Defined Benefit Plan Disclosure [Line Items] |
Schedule of Changes in Fair Value of Plan Assets | Changes in Fair Value of Plans’ Assets and Changes in Accumulated Postretirement Benefit Obligation for the years ended December 31, 2024 and 2023 were:
DOLLARS IN MILLIONS |  |
2024 |  | 2023
Fair Value of Plans’ Assets at Beginning of Year |  | $ | — |  |  | $ | — |
Employer Contributions |  | 0.4 |  |  | 1.0 |
Plan Participants’ Contributions |  | 0.1 |  |  | 0.3 |
Benefits Paid |  | (0.5) |  |  | (1.3) |
Fair Value of Plan Assets at End of Year |  | — |  |  | — |
Accumulated Postretirement Benefit Obligation at Beginning of Year |  | 7.5 |  |  | 8.1 |
Service Cost |  | 0.1 |  |  | 0.1 |
Interest Cost |  | 0.3 |  |  | 0.4 |
Plan Participants’ Contributions |  | 0.1 |  |  | 0.3 |
Benefits Paid |  | (0.5) |  |  | (1.3) |
Actuarial Gain |  | (1.0) |  |  | (0.1) |
Accumulated Postretirement Benefit Obligation at End of Year |  | 6.5 |  |  | 7.5 |
Funded Status—Accumulated Postretirement Benefit Obligation in Excess of Plans’ Assets |  | $ | (6.5) |  |  | $ | (7.5) |
Unamortized Actuarial Gain Reported in AOCI at End of Year |  | $ | 12.0 |  |  | $ | 13.9 |
Schedule of Assumptions Used | The weighted-average discount rate and rate of increase in future compensation levels used to develop the components of the Accumulated Postretirement Benefit Obligation at December 31, 2024 and 2023 were:
|  | 2024 |  | 2023
Discount Rate |  | 5.55 | % |  | 4.92 | %
Rate of Increase in Future Compensation Levels |  | 2.20 |  |  | 2.20 |
The weighted-average discount rate and rate of increase in future compensation levels used to develop OPEB Expense for the years ended December 31, 2024, 2023 and 2022 were:
|  | 2024 |  | 2023 |  | 2022
Weighted-average Discount Rate |  | 4.92 | % |  | 5.11 | % |  | 2.56 | %
Service Cost Discount Rate |  | 4.94 |  |  | 5.12 |  |  | 2.79 |
Interest Cost Discount Rate |  | 4.85 |  |  | 5.03 |  |  | 1.97 |
Effective Rate for Interest on Service Cost |  | 4.85 |  |  | 5.04 |  |  | 2.54 |
Rate of Increase in Future Compensation Levels |  | 2.20 |  |  | 2.20 |  |  | 2.20 |
Schedule of Comprehensive Other Postretirement Employee Benefit Expense | The components of Comprehensive OPEB (Income) Expense for the years ended December 31, 2024, 2023 and 2022 were:
DOLLARS IN MILLIONS |  | 2024 |  | 2023 |  | 2022
Service Cost Earned During the Year |  | $ | 0.1 |  |  | $ | 0.1 |  |  | $ | 0.2 |
Interest Cost on Accumulated Postretirement Benefit Obligation |  | 0.3 |  |  | 0.4 |  |  | 0.2 |
Amortization of Prior Service Credit |  | (1.3) |  |  | (1.3) |  |  | (1.3) |
Amortization of Accumulated Unrecognized OPEB Gain |  | (1.5) |  |  | (1.8) |  |  | (1.8) |
OPEB Income Recognized in Consolidated Statements of Income (Loss) |  | (2.4) |  |  | (2.6) |  |  | (2.7) |
Unrecognized OPEB Gain Arising During the Year |  | (1.0) |  |  | (0.1) |  |  | (2.5) |
Amortization of Prior Service Credit |  | 1.3 |  |  | 1.3 |  |  | 1.3 |
Amortization of Accumulated Unrecognized OPEB Gain |  | 1.5 |  |  | 1.8 |  |  | 1.8 |
Comprehensive OPEB (Income) Expense |  | $ | (0.6) |  |  | $ | 0.4 |  |  | $ | (2.1) |
Schedule of Expected Benefit Payments | The following benefit payments (net of participant contributions), which consider expected future service, as appropriate, are expected to be paid:
DOLLARS IN MILLIONS |  | Years Ending December 31,
2025 |  | 2026 |  | 2027 |  | 2028 |  | 2029 |  | 2030-2034
Estimated Benefit Payments: |  |  |  |  |  |  |  |  |  |  |  |
Excluding Medicare Part D Subsidy |  | $ | 0.9 |  |  | $ | 0.8 |  |  | $ | 0.8 |  |  | $ | 0.7 |  |  | $ | 0.6 |  |  | $ | 2.7 |
Expected Medicare Part D Subsidy |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Net Estimated Benefit Payments |  | $ | 0.9 |  |  | $ | 0.8 |  |  | $ | 0.8 |  |  | $ | 0.7 |  |  | $ | 0.6 |  |  | $ | 2.7 |

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