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STOCK COMPENSATION PLANS (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Approved Grants Equity Plans [Table Text Block] | Following is a summary of approved grants by the Compensation Committee:
Grant Year |  | Vesting Date |  | Plan |  | Restricted Stock Granted |  | Performance Shares Granted |  | Stock Options Granted
2017 |  | 12/31/2019 |  | Amended 2015 Equity Plan |  | 532,358 |  |  | 249,106 |  |  | — |
2017 |  | 12/31/2019 |  | 2015 Equity Plan |  | 553,725 |  |  | 553,725 |  |  | — |
2016 |  | 12/31/2018 |  | 2015 Equity Plan |  | 3,406,716 |  |  | — |  |  | — |
2015 |  | 12/15/2017 |  | 2015 Equity Plan |  | 1,473,184 |  |  | — |  |  | — |
2015 |  | 12/31/2017 |  | 2012 Equity Plan |  | 874,575 |  |  | 874,575 |  |  | 412,710 |
Stock Incentive Plans Disclosure [Table Text Block] | Following is a summary of our performance share award agreements currently outstanding:
Performance Share Plan Year |  | Performance Shares Granted |  | Forfeitures to Date |  | Expected to Vest |  | Grant Date |  | Performance Period
2017 |  | 249,106 |  |  | — |  |  | 249,106 |  |  | June 26, 2017 |  | 5/31/2017 - 12/31/2019
2017 |  | 553,725 |  |  | 5,192 |  |  | 548,533 |  |  | February 21, 2017 |  | 1/1/2017 - 12/31/2019
2015 1 |  | 410,105 |  |  | 155,235 |  |  | 254,870 |  |  | February 9, 2015 |  | 1/1/2015 - 12/31/2017
2015 1 |  | 464,470 |  |  | 68,667 |  |  | 395,803 |  |  | January 12, 2015 |  | 1/1/2015 - 12/31/2017
1 The performance shares granted in 2015 will have a payout of 75.3% of the original grant based on the final performance evaluation versus the performance goals that were established in the grants.
Incentive Compensation and Other Benefit Plans for Employees and Directors [Table Text Block] | For the last three years, Equity Grant shares have been awarded to elected or re-elected nonemployee Directors as follows:
Year of Grant |  | Restricted Equity Grant Shares |  | Deferred Equity Grant Shares
2015 |  | 109,408 |  |  | 25,248 |
2016 |  | 135,038 |  |  | 29,583 |
2017 |  | 93,359 |  |  | 17,289 |
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block] | The following table summarizes the share-based compensation expense that we recorded for continuing operations in 2017, 2016 and 2015:
| (In Millions, except per share amounts)
| 2017 |  | 2016 |  | 2015
Cost of goods sold and operating expenses | $ | 2.3 |  |  | $ | 2.1 |  |  | $ | 4.0 |
Selling, general and administrative expenses | 16.4 |  |  | 12.1 |  |  | 9.9 |
Reduction of operating income from continuing operations before income taxes and equity loss from ventures | 18.7 |  |  | 14.2 |  |  | 13.9 |
Income tax benefit 1 | — |  |  | — |  |  | — |
Reduction of net income attributable to Cliffs shareholders | $ | 18.7 |  |  | $ | 14.2 |  |  | $ | 13.9 |
Reduction of earnings per share attributable to Cliffs shareholders: |  |  |  |  |
Basic | $ | 0.06 |  |  | $ | 0.07 |  |  | $ | 0.09 |
Diluted | $ | 0.06 |  |  | $ | 0.07 |  |  | $ | 0.09 |
1 No income tax benefit due to the full valuation allowance.
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block] | Stock option, restricted stock awards and performance share activity under our long-term equity plans and Directors’ Plans are as follows:
| 2017 |  | 2016 |  | 2015
| Shares |  | Shares |  | Shares
Stock options: |  |  |  |  |
Outstanding at beginning of year | 599,870 |  |  | 607,489 |  |  | 250,000 |
Granted during the year | — |  |  | — |  |  | 412,710 |
Forfeited/canceled | — |  |  | (7,619 | ) |  | (55,221 | )
Outstanding at end of year | 599,870 |  |  | 599,870 |  |  | 607,489 |
Restricted awards: |  |  |  |  |
Outstanding and restricted at beginning of year | 5,461,783 |  |  | 2,338,070 |  |  | 523,176 |
Granted during the year | 1,196,731 |  |  | 3,571,337 |  |  | 2,482,415 |
Vested | (1,813,315 | ) |  | (271,988 | ) |  | (477,157 | )
Forfeited/canceled | (68,716 | ) |  | (175,636 | ) |  | (190,364 | )
Outstanding and restricted at end of year | 4,776,483 |  |  | 5,461,783 |  |  | 2,338,070 |
Performance shares: |  |  |  |  |
Outstanding at beginning of year | 1,368,469 |  |  | 1,496,489 |  |  | 1,072,376 |
Granted during the year | 802,831 |  |  | — |  |  | 874,575 |
Issued 1 | — |  |  | (59,260 | ) |  | (242,920 | )
Forfeited/canceled | (322,988 | ) |  | (68,760 | ) |  | (207,542 | )
Outstanding at end of year | 1,848,312 |  |  | 1,368,469 |  |  | 1,496,489 |
Vested or expected to vest as of December 31, 2017 2 | 7,224,665 |  |  |  |  |
Directors’ retainer and voluntary shares: |  |  |  |  |
Outstanding at beginning of year | — |  |  | — |  |  | — |
Granted during the year | 25,476 |  |  | — |  |  | — |
Vested | (25,476 | ) |  | — |  |  | — |
Outstanding at end of year | — |  |  | — |  |  | — |
Reserved for future grants or awards at end of year: |  |  |  |  |
Employee plans | 16,606,386 |  |  |  |  |
Directors’ plans | 612,266 |  |  |  |  |
Total | 17,218,652 |  |  |  |  |
1 For the year ended December 31, 2015, the shares vesting due to the change in control were paid out in cash, at target, and valued as of the respective participants' termination dates.
2 With the adoption of ASU 2016-09, we assume all shares are expected to vest and none will forfeit.
Employee Stock Awards Outstanding [Table Text Block] | A summary of our outstanding share-based awards as of December 31, 2017 is shown below:
| Shares |  | Weighted Average Grant Date Fair Value
Outstanding, beginning of year | 7,430,122 |  |  | $ | 5.55 |
Granted | 1,999,562 |  |  | $ | 12.19 |
Vested | (1,813,315 | ) |  | $ | 5.52 |
Forfeited/expired | (391,704 | ) |  | $ | 12.84 |
Outstanding, end of year | 7,224,665 |  |  | $ | 6.79 |

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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -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 1 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 + Details
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