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Pension Benefits and Postretirement Benefits Other Than Pensions (Tables) | 3 Months Ended
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Mar. 31, 2019
Pension Plans [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Schedule of Defined Benefit Plans Disclosures [Table Text Block] | The components of Pension Income for the Pension Plan for the three months ended March 31, 2019 and 2018 were:
|  | Three Months Ended
(Dollars in Millions) |  | Mar 31, 2019 |  | Mar 31, 2018
Service Cost |  | $ | — |  |  | $ | — |
Interest Cost on Projected Benefit Obligation |  | 5.5 |  |  | 5.1 |
Expected Return on Plan Assets |  | (7.6 | ) |  | (7.2 | )
Amortization of Net Actuarial Loss |  | 0.7 |  |  | 1.0 |
Total Pension Benefit Recognized |  | (1.4 | ) |  | (1.1 | )
Postretirement Benefits Other than Pensions [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Schedule of Defined Benefit Plans Disclosures [Table Text Block] | The components of OPEB benefits for the OPEB Plans for the three months ended March 31, 2019 and 2018 were:
|  | Three Months Ended
(Dollars in Millions) |  | Mar 31, 2019 |  | Mar 31, 2018
Service Cost |  | $ | 0.1 |  |  | $ | — |
Interest Cost on Accumulated Postretirement Benefit Obligation |  | 0.1 |  |  | 0.1 |
Amortization of Prior Service Credit |  | (0.3 | ) |  | (0.3 | )
Amortization of Net Gain |  | (0.5 | ) |  | (0.4 | )
Total OPEB Benefit Recognized |  | $ | (0.6 | ) |  | $ | (0.6 | )
The non-service cost component of the Pension Plan and OPEB Plans are presented within the Interest and Other Expenses line item in the Condensed Consolidated Statement of Income.

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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=112275985&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=108410482&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=108410482&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=108410482&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=108410482&loc=d3e2417-114920 + Details
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