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QUARTERLY RESULTS OF OPERATIONS (Schedule of Quarterly Financial Information) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Sep. 30, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |  |  |  |  |  |  |  |  |  |  | 25.3 | 25.2
Revenues | $ 754.0 | $ 553.3 | $ 496.2 | $ 305.5 | $ 476.0 | $ 593.2 | $ 498.1 | $ 446.0 |  | $ 2,109.0 | $ 2,013.3 | $ 3,373.2
SALES MARGIN | 181.5 | 85.4 | 91.5 | 30.9 | 43.3 | 55.1 | 57.3 | 80.8 |  | 389.3 | 236.5 | 885.7
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest | 100.1 | (25.1) | 29.9 | 114.3 | (34.8) | 49.9 | (38.2) | 166.8 |  | 219.2 | 143.7 | 56.4
Income (Loss) from Continuing Operations Attributable to Noncontrolling Interest | (1.7) | 2.0 | (16.7) | (8.8) | (2.4) | 4.6 | (5.0) | 1.9 |  | (25.2) | (8.6) | (25.9)
Income (Loss) from Continuing Operations Attributable to Parent | 98.4 | (23.1) | 13.2 | 105.5 |  | 54.5 | (43.2) | 168.7 | $ (37.2) | 194.0 | 135.1 | 30.5
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent | (19.3) | (2.7) | (0.4) | 2.5 | $ (23.1) | (43.9) | 103.4 | (928.5) |  | (19.9) | (884.4) | (7,254.7)
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS |  |  |  |  |  | 10.6 | 60.2 | (759.8) | (60.3) | 174.1 | (749.3) | (7,224.2)
Dividends, Preferred Stock |  |  |  |  |  |  |  |  |  | 0.0 | 38.4 | 51.2
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS COMMON SHAREHOLDERS | $ 79.1 | $ (25.8) | $ 12.8 | $ 108.0 |  | $ (15.0) | $ 60.2 | $ (772.6) | $ (60.3) | $ 174.1 | $ (787.7) | $ (7,275.4)
Continuing operations | $ 0.43 | $ (0.11) | $ 0.07 | $ 0.61 | $ (0.24) | $ 0.19 | $ (0.28) | $ 1.02 |  | $ 0.98 | $ 0.63 | $ (0.14)
Discontinued operations | (0.08) | (0.01) | 0.00 | 0.01 | (0.15) | (0.29) | 0.67 | (6.06) |  | (0.10) | (5.77) | (47.38)
Earnings Per Share, Basic | 0.35 | (0.12) | 0.07 | 0.62 | (0.39) | (0.10) | 0.39 | (5.04) |  | 0.88 | (5.14) | (47.52)
Continuing operations | 0.42 | (0.11) | 0.07 | 0.61 | (0.24) | 0.19 | (0.28) | 0.94 |  | 0.97 | 0.63 | (0.14)
Discontinued operations | (0.08) | (0.01) | 0.00 | 0.01 | (0.15) | (0.29) | 0.67 | (5.20) |  | (0.10) | (5.76) | (47.38)
Earnings Per Share, Diluted | $ 0.34 | $ (0.12) | $ 0.07 | $ 0.62 | $ (0.39) | $ (0.10) | $ 0.39 | $ (4.26) |  | $ 0.87 | $ (5.13) | $ (47.52)
Antidilutive Incremental Common Shares Excluded and Attributable to Share-based Payment Arrangements | 0.0 | 3.0 |  |  |  |  |  |  |  |  |  | 0.7
Preferred Class A [Member] |  |  |  |  |  |  |  |  |  |  |  |
Dividends, Preferred Stock |  |  |  |  | $ 0.0 | $ 25.6 | $ 0.0 | $ 12.8 |  | $ 0.0 | $ 38.4 | $ 51.2
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |  |  |  |  |  |  |  |  |  |  | 25.6 |
Antidilutive Incremental Common Shares Excluded and Attributable to Share-based Payment Arrangements |  |  |  |  |  |  |  |  |  |  | 0.3 |

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