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STOCK COMPENSATION PLANS (Tables) | 12 Months Ended
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Dec. 31, 2018
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 Issued Under |  | Restricted Stock Units Granted |  | Performance Shares Granted
2018 |  | 12/31/2020 |  | A&R 2015 Equity Plan |  | 685,599 |  |  | 675,599 |
2017 |  | 12/31/2019 |  | A&R 2015 Equity Plan |  | 532,358 |  |  | 249,106 |
2017 |  | 12/31/2019 |  | Amended 2015 Equity Plan |  | 553,725 |  |  | 553,725 |
2016 |  | 12/31/2018 |  | 2015 Equity Plan |  | 3,406,716 |  |  | — |
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 |  | Grant Date Fair Value |  | Performance Period
2018 |  | 675,599 |  |  | 2,236 |  |  | 673,363 |  |  | 2/21/2018 |  | $ | 11.93 |  |  | 1/1/2018 - 12/31/2020
2017 |  | 249,106 |  |  | — |  |  | 249,106 |  |  | 6/26/2017 |  | $ | 10.74 |  |  | 5/31/2017 - 12/31/2019
2017 |  | 553,725 |  |  | 51,471 |  |  | 502,254 |  |  | 2/21/2017 |  | $ | 19.69 |  |  | 1/1/2017 - 12/31/2019
Incentive Compensation and Other Benefit Plans for Employees and Directors [Table Text Block] | For the last three years, grants of restricted and/or deferred shares have been awarded to elected or re-elected nonemployee directors as follows:
Year of Grant |  | Restricted Shares |  | Deferred Shares
2018 |  | 92,718 |  |  | 17,170 |
2017 |  | 93,359 |  |  | 17,289 |
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 in continuing operations:
| (In Millions, except per share amounts)
| 2018 |  | 2017 |  | 2016
Cost of goods sold and operating expenses | $ | 1.7 |  |  | $ | 1.9 |  |  | $ | 1.8 |
Selling, general and administrative expenses | 13.4 |  |  | 16.3 |  |  | 11.8 |
Reduction of operating income from continuing operations before income taxes | 15.1 |  |  | 18.2 |  |  | 13.6 |
Income tax benefit 1 | — |  |  | — |  |  | — |
Reduction of net income from continuing operations attributable to Cliffs shareholders | $ | 15.1 |  |  | $ | 18.2 |  |  | $ | 13.6 |
Reduction of continuing operations earnings per common share attributable to Cliffs shareholders: |  |  |  |  |
Basic | $ | 0.05 |  |  | $ | 0.06 |  |  | $ | 0.07 |
Diluted | $ | 0.05 |  |  | $ | 0.06 |  |  | $ | 0.07 |
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:
| 2018 |  | 2017 |  | 2016
| Shares |  | Shares |  | Shares
Stock options: |  |  |  |  |
Outstanding at beginning of year | 599,870 |  |  | 599,870 |  |  | 607,489 |
Exercised | (36,640 | ) |  | — |  |  | — |
Forfeited/canceled | — |  |  | — |  |  | (7,619 | )
Outstanding at end of year | 563,230 |  |  | 599,870 |  |  | 599,870 |
Restricted awards: |  |  |  |  |
Outstanding and restricted at beginning of year | 4,776,483 |  |  | 5,461,783 |  |  | 2,338,070 |
Granted during the year | 795,487 |  |  | 1,196,731 |  |  | 3,571,337 |
Vested and issued | (627,567 | ) |  | (1,813,315 | ) |  | (271,988 | )
Forfeited/canceled | (140,155 | ) |  | (68,716 | ) |  | (175,636 | )
Outstanding and restricted at end of year | 4,804,248 |  |  | 4,776,483 |  |  | 5,461,783 |
Performance shares: |  |  |  |  |
Outstanding at beginning of year | 1,848,312 |  |  | 1,368,469 |  |  | 1,496,489 |
Granted during the year | 675,599 |  |  | 802,831 |  |  | — |
Vested and issued | (489,953 | ) |  | — |  |  | (59,260 | )
Forfeited/canceled | (609,235 | ) |  | (322,988 | ) |  | (68,760 | )
Outstanding at end of year | 1,424,723 |  |  | 1,848,312 |  |  | 1,368,469 |
Vested or expected to vest as of December 31, 2018 1 | 6,792,201 |  |  |  |  |
Directors’ retainer and voluntary shares: |  |  |  |  |
Outstanding at beginning of year | — |  |  | — |  |  | — |
Granted during the year | 27,300 |  |  | 25,476 |  |  | — |
Vested and issued | (27,300 | ) |  | (25,476 | ) |  | — |
Outstanding at end of year | — |  |  | — |  |  | — |
Reserved for future grants or awards at end of year: |  |  |  |  |
Employee plans | 12,949,420 |  |  |  |  |
Directors’ plans | 502,378 |  |  |  |  |
Total | 13,451,798 |  |  |  |  |
1 With the adoption of ASU 2016-09, we assume all shares will vest until the date of vesting or forfeiture.
Employee Stock Awards Outstanding [Table Text Block] | A summary of our outstanding share-based awards as of December 31, 2018 is shown below:
| Shares |  | Weighted Average Grant Date Fair Value
Outstanding, beginning of year | 7,224,665 |  |  | $ | 6.79 |
Granted | 1,498,386 |  |  | $ | 9.51 |
Vested and issued | (1,181,460 | ) |  | $ | 7.38 |
Forfeited/canceled | (749,390 | ) |  | $ | 10.22 |
Outstanding, end of year | 6,792,201 |  |  | $ | 6.90 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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