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SHAREHOLDERS' EQUITY Schedule of Shareholders' Equity (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015
Stockholders' Equity Attributable to Parent | $ (830.1) |  | $ (1,464.3) |
Stockholders' Equity Attributable to Noncontrolling Interest | 127.1 |  | 133.8 |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | (703.0) | $ (1,696.7) | (1,330.5) | $ (1,811.6)
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS | (28.1) | 108.0 |  |
INCOME (LOSS) ATTRIBUTABLE TO NONCONTROLLING INTEREST | (1.7) | 8.8 |  |
Net Income (Loss) | (29.8) | 116.8 |  |
Other comprehensive income (loss) | (31.1) | 113.7 |  |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest | (5.0) | 0.6 |  |
Other Comprehensive Income (Loss), Net of Tax | (8.0) | 6.3 |  |
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest | (37.8) | 123.1 |  |
Stock and Other Incentive Plans | 4.0 | 2.9 |  |
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders |  | (17.0) |  |
Undistributed Gains To Noncontrolling Interest |  | 0.5 |  |
Cliffs Shareholders Equity [Member] |  |  |  |
Stockholders' Equity Attributable to Parent | (830.1) | (1,859.4) | (1,464.3) | (1,981.4)
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS | (28.1) | 108.0 |  |
Other comprehensive income (loss) | (3.0) | 5.7 |  |
TOTAL COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS | (31.1) | 113.7 |  |
Stock and Other Incentive Plans | 4.0 | 2.9 |  |
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders |  | 0.0 |  |
Undistributed Gains To Noncontrolling Interest |  | 0.0 |  |
Noncontrolling Interest [Member] |  |  |  |
Stockholders' Equity Attributable to Noncontrolling Interest | 127.1 | 162.7 | $ 133.8 | $ 169.8
INCOME (LOSS) ATTRIBUTABLE TO NONCONTROLLING INTEREST | (1.7) | 8.8 |  |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest | (5.0) | 0.6 |  |
OTHER COMPREHENSIVE LOSS (INCOME) ATTRIBUTABLE TO THE NONCONTROLLING INTEREST | (6.7) | 9.4 |  |
Stock and Other Incentive Plans | 0.0 | 0.0 |  |
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders |  | (17.0) |  |
Undistributed Gains To Noncontrolling Interest |  | (0.5) |  |
Common Stock [Member] |  |  |  |
Stock Issued During Period, Value, New Issues | 661.3 | 5.4 |  |
Common Stock [Member] | Cliffs Shareholders Equity [Member] |  |  |  |
Stock Issued During Period, Value, New Issues | 661.3 | 5.4 |  |
Common Stock [Member] | Noncontrolling Interest [Member] |  |  |  |
Stock Issued During Period, Value, New Issues | $ 0.0 | $ 0.0 |  |

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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=51831270 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Comprehensive Income -URI http://asc.fasb.org/extlink&oid=51831223 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e557-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=51831255 + Details
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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(22)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(24)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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