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Pension Benefits and Postretirement Benefits Other Than Pensions (Tables) | 6 Months Ended
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Jun. 30, 2017
Pension Plans [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Schedule of Defined Benefit Plans Disclosures [Table Text Block] | The components of Pension Expense (Benefit) for the Pension Plan for the six and three months ended June 30, 2017 and 2016 were:
|  | Six Months Ended |  | Three Months Ended
(Dollars in Millions) |  | Jun 30, 2017 |  | Jun 30, 2016 |  | Jun 30, 2017 |  | Jun 30, 2016
Service Cost Earned |  | $ | — |  |  | $ | 4.8 |  |  | $ | — |  |  | $ | 2.6 |
Interest Cost on Projected Benefit Obligation |  | 10.3 |  |  | 10.4 |  |  | 5.2 |  |  | 5.0 |
Expected Return on Plan Assets |  | (15.5 | ) |  | (16.2 | ) |  | (7.8 | ) |  | (8.0 | )
Amortization of Accumulated Net Unrecognized Pension Costs |  | 1.3 |  |  | 4.9 |  |  | 0.7 |  |  | 1.9 |
Curtailment Gain |  | — |  |  | (0.3 | ) |  | — |  |  | (0.3 | )
Total Pension Expense (Benefit) Recognized |  | $ | (3.9 | ) |  | $ | 3.6 |  |  | $ | (1.9 | ) |  | $ | 1.2 |
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 Benefit for the OPEB Plan for the six and three months ended June 30, 2017 and 2016 were:
|  | Six Months Ended |  | Three Months Ended
(Dollars in Millions) |  | Jun 30, 2017 |  | Jun 30, 2016 |  | Jun 30, 2017 |  | Jun 30, 2016
Service Cost Earned |  | $ | 0.1 |  |  | $ | — |  |  | 0.1 |  |  | — |
Interest Cost on Accumulated Postretirement Benefit Obligation |  | 0.2 |  |  | 0.4 |  |  | 0.1 |  |  | 0.2 |
Amortization of Prior Service Credit |  | (0.7 | ) |  | — |  |  | (0.4 | ) |  | — |
Amortization of Accumulated Net Unrecognized Gain |  | (0.9 | ) |  | (0.7 | ) |  | (0.5 | ) |  | (0.4 | )
Total OPEB Benefit |  | $ | (1.3 | ) |  | $ | (0.3 | ) |  | $ | (0.7 | ) |  | $ | (0.2 | )

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2439-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2417-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2410-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=73719040&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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