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Stock-Based Compensation | 9 Months Ended
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Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Disclosure of Compensation Related Costs, Share-based Payments [Text Block] | STOCK-BASED COMPENSATION We have a Management Incentive Plan (MIP) that is administered by the Compensation Committee of the Board of Directors. The Compensation Committee authorizes the grants of restricted stock (shares or units), performance share awards payable in stock based upon the attainment of specified performance goals and stock settled stock appreciation rights (SSARs). As of September 30, 2018, 2.9 million shares were available for grant under the 2013 Omnibus Plan.
| 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 |
At September 30, 2018, $13.7 million of compensation cost related to unvested performance shares, restricted stock and SSARs attributable to future service had not yet been recognized. During the first nine months of 2018, we granted 159,054 performance units at an average grant date fair value of $29.31 per share and 321,048 restricted stock units at an average grant date fair value of $26.96 per share.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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