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EARNINGS PER SHARE (Tables) | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share [Abstract] |
Earnings Per Share Computation | The following table summarizes the computation of basic and diluted EPS:
| (In Millions, Except Per Share Amounts)
| Year Ended December 31,
| 2020 |  | 2019 |  | 2018
Income (loss) from continuing operations | $ | (82) |  |  | $ | 295 |  |  | $ | 1,040 |
Income from continuing operations attributable to noncontrolling interest | (41) |  |  | — |  |  | — |
Net income (loss) from continuing operations attributable to Cliffs shareholders | (123) |  |  | 295 |  |  | 1,040 |
Income (loss) from discontinued operations, net of tax | 1 |  |  | (2) |  |  | 88 |
Net income (loss) attributable to Cliffs shareholders | $ | (122) |  |  | $ | 293 |  |  | $ | 1,128 |
Weighted average number of shares: |  |  |  |  |
Basic | 379 |  |  | 277 |  |  | 297 |
Convertible senior notes | — |  |  | 4 |  |  | 3 |
Employee stock plans | — |  |  | 3 |  |  | 4 |
Diluted | 379 |  |  | 284 |  |  | 304 |
Earnings (loss) per common share attributable to Cliffs common shareholders - basic: |  |  |  |  |
Continuing operations | $ | (0.32) |  |  | $ | 1.07 |  |  | $ | 3.50 |
Discontinued operations | — |  |  | (0.01) |  |  | 0.30 |
| $ | (0.32) |  |  | $ | 1.06 |  |  | $ | 3.80 |
Earnings (loss) per common share attributable to Cliffs common shareholders - diluted: |  |  |  |  |
Continuing operations | $ | (0.32) |  |  | $ | 1.04 |  |  | $ | 3.42 |
Discontinued operations | — |  |  | (0.01) |  |  | 0.29 |
| $ | (0.32) |  |  | $ | 1.03 |  |  | $ | 3.71 |
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share | The following table summarizes the shares that have been excluded from the diluted earnings per share calculation for the year ended December 31, 2020, as they were anti-dilutive:
| (In Millions)
| 2020
Redeemable preferred shares | 4 |
Convertible senior notes | 2 |
Shares related to employee stock plans | 1 |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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