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Defined Benefit Pension Plans (Tables) | 9 Months Ended
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Sep. 30, 2018
Retirement Benefits [Abstract] |
Schedule of Defined Benefit Plans Disclosures [Table Text Block] | The net periodic pension cost included the following components:
| Quarter Ended |  | Nine Months Ended
| September 30, |  | September 30,
Dollar amounts in millions | 2018 |  | 2017 |  | 2018 |  | 2017
Service cost | $ | 1.2 |  |  | $ | 1.4 |  |  | $ | 3.4 |  |  | $ | 4.1 |
Other components of net periodic pension cost: |  |  |  |  |  |  |
Interest cost | 2.9 |  |  | 3.3 |  |  | 8.6 |  |  | 9.7 |
Expected return on plan assets | (3.3 | ) |  | (3.3 | ) |  | (10.1 | ) |  | (9.8 | )
Amortization of prior service cost 1 | 0.1 |  |  | 0.2 |  |  | 0.3 |  |  | 0.6 |
Amortization of net loss 1 | 1.5 |  |  | 1.4 |  |  | 4.7 |  |  | 4.2 |
Net periodic pension cost | $ | 2.4 |  |  | $ | 3.0 |  |  | $ | 6.9 |  |  | $ | 8.8 |
Net periodic pension cost included in cost of sales | $ | 0.8 |  |  | $ | 0.9 |  |  | $ | 2.1 |  |  | $ | 2.7 |
Net periodic pension cost included in selling, general, and administrative expenses | 0.4 |  |  | 0.5 |  |  | 1.3 |  |  | 1.4 |
Net periodic pension cost included in other non-operating items | 1.2 |  |  | 1.6 |  |  | 3.5 |  |  | 4.7 |
| $ | 2.4 |  |  | $ | 3.0 |  |  | $ | 6.9 |  |  | $ | 8.8 |

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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=82843861&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=82843861&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=82843861&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=77993564&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=82843861&loc=d3e1928-114920 + Details
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