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Pension Benefits and Postretirement Benefits Other Than Pensions (Tables) | 3 Months Ended
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Mar. 31, 2021
Pension Plans |
Defined Benefit Plan Disclosure [Line Items] |
Schedule of Defined Benefit Plans Disclosures | The components of Pension Income for the Pension Plan for the three months ended March 31, 2021 and 2020 were:
|  | Three Months Ended |  |
(Dollars in Millions) |  | Mar 31, 2021 |  | Mar 31, 2020 |  |  |  |
Interest Cost on Projected Benefit Obligation |  | $ | 1.8 |  |  | $ | 4.5 |  |  |  |  |
Expected Return on Plan Assets |  | (2.3) |  |  | (7.3) |  |  |  |  |
Amortization of Net Actuarial Loss |  | 0.7 |  |  | 1.5 |  |  |  |  |
Total Pension (Benefit) Expense |  | $ | 0.2 |  |  | $ | (1.3) |  |  |  |  |
Postretirement Benefits Other than Pensions |
Defined Benefit Plan Disclosure [Line Items] |
Schedule of Defined Benefit Plans Disclosures | The components of OPEB benefits for the OPEB Plans for the three months ended March 31, 2021 and 2020 were:
|  | Three Months Ended |  |
(Dollars in Millions) |  | Mar 31, 2021 |  | Mar 31, 2020 |  |  |  |
Service Cost |  | $ | 0.1 |  |  | $ | 0.1 |  |  |  |  |
Interest Cost on Accumulated Postretirement Benefit Obligation |  | — |  |  | 0.1 |  |  |  |  |
Amortization of Prior Service Credit |  | (0.3) |  |  | (0.3) |  |  |  |  |
Amortization of Net Gain |  | (0.4) |  |  | (0.5) |  |  |  |  |
Total OPEB (Benefit) Expense |  | $ | (0.6) |  |  | $ | (0.6) |  |  |  |  |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2439-114920 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2410-114920 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2417-114920 + Details
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