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v3.23.2

Pension Benefits and Postretirement Benefits Other Than Pensions (Tables) | 6 Months Ended
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Jun. 30, 2023
Pension Plans |
Defined Benefit Plan Disclosure [Line Items] |
Schedule of Defined Benefit Plans Disclosures | The components of Pension Expense for the Pension Plan for the six and three months ended June 30, 2023 and 2022 were:
|  | Six Months Ended |  | Three Months Ended
(Dollars in Millions) |  | Jun 30, 2023 |  | Jun 30, 2022 |  | Jun 30, 2023 |  | Jun 30, 2022
Interest Cost on Projected Benefit Obligation |  | $ | 6.9 |  |  | $ | 4.3 |  |  | $ | 3.5 |  |  | $ | 2.1 |
Expected Return on Plan Assets |  | (6.5) |  |  | (3.7) |  |  | (3.2) |  |  | (1.8) |
Amortization of Prior Service Cost |  | 0.3 |  |  | 0.3 |  |  | 0.1 |  |  | 0.1 |
Amortization of Net Actuarial Loss |  | — |  |  | 0.9 |  |  | — |  |  | 0.5 |
Total Pension Expense |  | $ | 0.7 |  |  | $ | 1.8 |  |  | $ | 0.4 |  |  | $ | 0.9 |
Postretirement Benefits Other than Pensions |
Defined Benefit Plan Disclosure [Line Items] |
Schedule of Defined Benefit Plans Disclosures | The components of OPEB Benefit for the OPEB Plans for the six and three months ended June 30, 2023 and 2022 were:
|  | Six Months Ended |  | Three Months Ended
(Dollars in Millions) |  | Jun 30, 2023 |  | Jun 30, 2022 |  | Jun 30, 2023 |  | Jun 30, 2022
Service Cost |  | $ | 0.1 |  |  | $ | 0.1 |  |  | $ | 0.1 |  |  | $ | — |
Interest Cost on Accumulated Postretirement Benefit Obligation |  | 0.2 |  |  | 0.1 |  |  | 0.1 |  |  | 0.1 |
Amortization of Prior Service Credit |  | (0.7) |  |  | (0.7) |  |  | (0.4) |  |  | (0.4) |
Amortization of Net Gain |  | (0.9) |  |  | (0.8) |  |  | (0.5) |  |  | (0.4) |
Total OPEB Benefit |  | $ | (1.3) |  |  | $ | (1.3) |  |  | $ | (0.7) |  |  | $ | (0.7) |

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 20 -Topic 715 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-17 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-3 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-4 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-2 + Details
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