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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Share-based Compensation, Stock Options, Activity [Table Text Block] |
| Quarter Ended |  | Nine Months Ended
| September 30, |  | September 30,
Dollar amounts in millions | 2018 |  | 2017 |  | 2018 |  | 2017
Total stock-based compensation expense (cost of sales, selling, general and administrative and other operating credits and charges, net) | $ | 2.1 |  |  | $ | 2.0 |  |  | $ | 6.9 |  |  | $ | 8.0 |
Income tax provision related to stock-based compensation | (0.3 | ) |  | 0.2 |  |  | (3.1 | ) |  | 0.5 |
Impact on cash flow due to taxes paid related to net share settlement of equity awards | 1.5 |  |  | 0.5 |  |  | 9.3 |  |  | 5.3 |

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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