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Defined Benefit Pension Plans (Tables) | 6 Months Ended
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Jun. 30, 2015
Compensation and Retirement Disclosure [Abstract] |
Schedule of Defined Benefit Plans Disclosures [Table Text Block] | The net periodic pension cost included the following components:
| Quarter Ended June 30, |  | Six Months Ended June 30,
Dollar amounts in millions | 2015 |  | 2014 |  | 2015 |  | 2014
Service cost | $ | 1.0 |  |  | $ | 0.9 |  |  | $ | 2.0 |  |  | $ | 1.9 |
Interest cost | 3.4 |  |  | 3.6 |  |  | 6.8 |  |  | 7.3 |
Expected return on plan assets | (3.8 | ) |  | (4.2 | ) |  | (7.6 | ) |  | (8.5 | )
Amortization of prior service cost | 0.1 |  |  | — |  |  | 0.2 |  |  | — |
Amortization of net loss | 1.8 |  |  | 1.4 |  |  | 3.6 |  |  | 2.8 |
Net periodic pension cost | $ | 2.5 |  |  | $ | 1.7 |  |  | $ | 5.0 |  |  | $ | 3.5 |

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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=58740216&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=58740216&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=58740216&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=58242635&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=58740216&loc=d3e1928-114920 + Details
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