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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, 2020
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, 2020 and 2019 were:
DOLLARS IN MILLIONS |  |
2020 |  | 2019
Fair Value of Plans’ Assets at Beginning of Year |  | $ | — |  |  | $ | — |
Employer Contributions |  | 1.5 |  |  | 1.1 |
Plan Participants’ Contributions |  | 0.2 |  |  | 0.3 |
Benefits Paid |  | (1.7) |  |  | (1.4) |
Fair Value of Plan Assets at End of Year |  | — |  |  | — |
Accumulated Postretirement Benefit Obligation at Beginning of Year |  | 12.8 |  |  | 15.0 |
Service Cost |  | 0.2 |  |  | 0.2 |
Interest Cost |  | 0.3 |  |  | 0.4 |
Plan Participants’ Contributions |  | 0.2 |  |  | 0.3 |
Benefits Paid |  | (1.7) |  |  | (1.4) |
Actuarial Gain |  | 1.9 |  |  | (1.7) |
Accumulated Postretirement Benefit Obligation at End of Year |  | 13.7 |  |  | 12.8 |
Funded Status—Accumulated Postretirement Benefit Obligation in Excess of Plans’ Assets |  | $ | (13.7) |  |  | $ | (12.8) |
Unamortized Actuarial Gain Reported in AOCI at End of Year |  | $ | 18.7 |  |  | $ | 23.8 |
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, 2020 and 2019 were:
|  | 2020 |  | 2019
Discount Rate |  | 2.13 | % |  | 2.91 | %
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, 2020, 2019 and 2018 were:
|  | 2020 |  | 2019 |  | 2018
Weighted-average Discount Rate |  | 2.96 | % |  | 4.08 | % |  | 3.36 | %
Service Cost Discount Rate |  | 2.94 |  |  | 4.16 |  |  | 3.52 |
Interest Cost Discount Rate |  | 2.47 |  |  | 3.69 |  |  | 2.96 |
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 Expense (Income) for the years ended December 31, 2020, 2019 and 2018 were:
DOLLARS IN MILLIONS |  | 2020 |  | 2019 |  | 2018
Service Cost Earned During the Year |  | $ | 0.2 |  |  | $ | 0.2 |  |  | $ | 0.2 |
Interest Cost on Accumulated Postretirement Benefit Obligation |  | 0.3 |  |  | 0.4 |  |  | 0.4 |
Amortization of Prior Service Credit |  | (1.3) |  |  | (1.3) |  |  | (1.3) |
Amortization of Accumulated Unrecognized OPEB Gain |  | (1.9) |  |  | (2.4) |  |  | (1.8) |
OPEB Income Recognized in Consolidated Statements of Income |  | (2.7) |  |  | (3.1) |  |  | (2.5) |
Unrecognized OPEB (Gain) Loss Arising During the Year |  | 1.9 |  |  | (1.7) |  |  | (3.0) |
Amortization of Prior Service Credit |  | 1.3 |  |  | 1.3 |  |  | 1.3 |
Amortization of Accumulated Unrecognized OPEB Gain |  | 1.9 |  |  | 2.4 |  |  | 1.8 |
Comprehensive OPEB (Income) Loss |  | $ | 2.4 |  |  | $ | (1.1) |  |  | $ | (2.4) |
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,
2021 |  | 2022 |  | 2023 |  | 2024 |  | 2025 |  | 2026-2030
Estimated Benefit Payments: |  |  |  |  |  |  |  |  |  |  |  |
Excluding Medicare Part D Subsidy |  | $ | 1.3 |  |  | $ | 1.3 |  |  | $ | 1.3 |  |  | $ | 1.3 |  |  | $ | 1.2 |  |  | $ | 4.6 |
Expected Medicare Part D Subsidy |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Net Estimated Benefit Payments |  | $ | 1.3 |  |  | $ | 1.3 |  |  | $ | 1.3 |  |  | $ | 1.3 |  |  | $ | 1.2 |  |  | $ | 4.6 |

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