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STOCK COMPENSATION PLANS (Tables) | 12 Months Ended
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Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
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 |  | Estimated Forfeitures |  | Expected to Vest |  | Grant Date |  | Performance Period
2015 |  | 410,105 |  |  | 157,979 |  |  | 252,126 |  |  | February 9, 2015 |  | 1/1/2015 - 12/31/2017
2015 |  | 464,470 |  |  | 82,636 |  |  | 381,834 |  |  | January 12, 2015 |  | 1/1/2015 - 12/31/2017
2014 1 |  | 188,510 |  |  | 188,510 |  |  | — |  |  | July 29, 2014 |  | 1/1/2014 - 12/31/2016
2014 1 |  | 80,560 |  |  | 80,560 |  |  | — |  |  | May 12, 2014 |  | 1/1/2014 - 12/31/2016
2014 1 |  | 230,265 |  |  | 230,265 |  |  | — |  |  | February 10, 2014 |  | 1/1/2014 - 12/31/2016
1 The performance shares granted in 2014 will have a payout of 0% 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
2014 |  | 73,635 |  |  | — |
2015 |  | 109,408 |  |  | 25,248 |
2016 |  | 135,038 |  |  | 29,583 |
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 2016, 2015 and 2014:
| (In Millions, except per share amounts)
| 2016 |  | 2015 |  | 2014
Cost of goods sold and operating expenses | $ | 2.1 |  |  | $ | 4.0 |  |  | $ | 5.6 |
Selling, general and administrative expenses | 12.1 |  |  | 9.9 |  |  | 15.9 |
Reduction of operating income from continuing operations before income taxes and equity loss from ventures | 14.2 |  |  | 13.9 |  |  | 21.5 |
Income tax benefit 1 | — |  |  | — |  |  | (7.5 | )
Reduction of net income attributable to Cliffs shareholders | $ | 14.2 |  |  | $ | 13.9 |  |  | $ | 14.0 |
Reduction of earnings per share attributable to Cliffs shareholders: |  |  |  |  |
Basic | $ | 0.07 |  |  | $ | 0.09 |  |  | $ | 0.09 |
Diluted | $ | 0.07 |  |  | $ | 0.09 |  |  | $ | 0.09 |
1 No income tax benefit for the year ended December 31, 2016 and December 31, 2015, due to the full valuation allowance.
Schedule Of Share-Based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions | No performance shares were granted in 2016, therefore no fair value analysis was required.
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] | No stock options were granted in 2016, therefore no fair value analysis was required.
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block] | Stock option, restricted share awards and performance share activity under our long-term equity plans and Directors’ Plans are as follows:
| 2016 |  | 2015 |  | 2014
| Shares |  | Shares |  | Shares
Stock options: |  |  |  |  |
Outstanding at beginning of year | 607,489 |  |  | 250,000 |  |  | — |
Granted during the year | — |  |  | 412,710 |  |  | 250,000 |
Forfeited/canceled | (7,619 | ) |  | (55,221 | ) |  | — |
Outstanding at end of year | 599,870 |  |  | 607,489 |  |  | 250,000 |
Restricted awards: |  |  |  |  |
Outstanding and restricted at beginning of year | 2,338,070 |  |  | 523,176 |  |  | 586,084 |
Granted during the year | 3,571,337 |  |  | 2,482,415 |  |  | 531,030 |
Vested | (271,988 | ) |  | (477,157 | ) |  | (423,822 | )
Forfeited/canceled | (175,636 | ) |  | (190,364 | ) |  | (170,116 | )
Outstanding and restricted at end of year | 5,461,783 |  |  | 2,338,070 |  |  | 523,176 |
Performance shares: |  |  |  |  |
Outstanding at beginning of year | 1,496,489 |  |  | 1,072,376 |  |  | 1,040,453 |
Granted during the year | — |  |  | 874,575 |  |  | 1,233,685 |
Issued 1 | (59,260 | ) |  | (242,920 | ) |  | (796,624 | )
Forfeited/canceled | (68,760 | ) |  | (207,542 | ) |  | (405,138 | )
Outstanding at end of year | 1,368,469 |  |  | 1,496,489 |  |  | 1,072,376 |
Vested or expected to vest as of December 31, 2016 | 6,716,979 |  |  |  |  |
Directors’ retainer and voluntary shares: |  |  |  |  |
Outstanding at beginning of year | — |  |  | — |  |  | 7,329 |
Granted during the year | — |  |  | — |  |  | 2,281 |
Vested | — |  |  | — |  |  | (9,610 | )
Outstanding at end of year | — |  |  | — |  |  | — |
Reserved for future grants or awards at end of year: |  |  |  |  |
Employee plans | 6,514,038 |  |  |  |  |
Directors’ plans | 676,678 |  |  |  |  |
Total | 7,190,716 |  |  |  |  |
1 The performance shares granted in 2014 will have a payout of 0% of the original grant based on the final performance evaluation versus the performance goals that were established in the grants. These shares are not included in this number because they expire and will be ultimately forfeited in February 2017. 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. For the year ended December 31, 2014, the shares vesting on December 31, 2013 were valued as of February 10, 2014, and the shares vesting due to the change in a majority of our Board of Directors that triggered the acceleration of vesting and payout of outstanding equity grants under our equity plans on August 6, 2014 were paid out in cash, at target, and valued as of that date.
Employee Stock Awards Outstanding [Table Text Block] | A summary of our outstanding share-based awards as of December 31, 2016 is shown below:
| Shares |  | Weighted Average Grant Date Fair Value
Outstanding, beginning of year | 4,442,048 |  |  | $ | 8.93 |
Granted | 3,571,337 |  |  | $ | 1.93 |
Vested | (331,248 | ) |  | $ | 11.25 |
Forfeited/expired | (252,015 | ) |  | $ | 5.90 |
Outstanding, end of year | 7,430,122 |  |  | $ | 5.55 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] | A summary of our stock option grants vested or expected to vest as of December 31, 2016 is shown below:
| Shares |  | Weighted-Average Exercise Price |  | Aggregate Intrinsic Value |  | Weighted-Average Remaining Contractual Term (Years)
Expected to vest | 417,914 |  |  | $ | 8.88 |  |  | $ | 239,640 |  |  | 7.43
Exercisable | 166,667 |  |  | $ | 13.83 |  |  | $ | — |  |  | 4.88

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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=6415400&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=6415400&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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