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Quarterly report pursuant to Section 13 or 15(d)

SHAREHOLDERS' EQUITY Schedule of Shareholders' Equity (Details)

v3.5.0.2
SHAREHOLDERS' EQUITY Schedule of Shareholders' Equity (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Stockholders' Equity Attributable to Parent $ (1,830.7) Ìý $ (1,830.7) Ìý $ (1,981.4) Ìý
Stockholders' Equity Attributable to Noncontrolling Interest 151.8 Ìý 151.8 Ìý 169.8 Ìý
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest (1,678.9) $ (1,740.2) (1,678.9) $ (1,740.2) (1,811.6) $ (1,734.3)
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS 12.8 60.2 120.8 (699.6) Ìý Ìý
INCOME (LOSS) ATTRIBUTABLE TO NONCONTROLLING INTEREST 16.7 5.0 25.5 3.1 Ìý Ìý
Net Income (Loss) 29.5 65.2 146.3 (696.5) Ìý Ìý
Other Comprehensive Income (Loss), Net of Tax 4.0 10.1 10.3 206.9 Ìý Ìý
TOTAL COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS 16.1 69.5 129.8 (482.7) Ìý Ìý
OTHER COMPREHENSIVE LOSS (INCOME) ATTRIBUTABLE TO THE NONCONTROLLING INTEREST 0.7 0.8 1.3 (10.0) Ìý Ìý
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Ìý Ìý 156.6 (489.6) Ìý Ìý
Deconsolidation, Gain (Loss), Amount Ìý Ìý Ìý 528.2 Ìý Ìý
Stock and Other Incentive Plans Ìý Ìý 6.5 3.0 Ìý Ìý
Preferred share dividends Ìý Ìý Ìý (12.8) Ìý Ìý
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Ìý Ìý (41.4) Ìý Ìý Ìý
Undistributed Gains To Noncontrolling Interest Ìý Ìý (3.4) (34.7) Ìý Ìý
Cliffs Shareholders Equity [Member] Ìý Ìý Ìý Ìý Ìý Ìý
Stockholders' Equity Attributable to Parent (1,830.7) (1,923.8) (1,830.7) (1,923.8) (1,981.4) (1,431.3)
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS Ìý Ìý 120.8 (699.6) Ìý Ìý
Other comprehensive income (loss) Ìý Ìý 9.0 216.9 Ìý Ìý
TOTAL COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS Ìý Ìý 129.8 (482.7) Ìý Ìý
Deconsolidation, Gain (Loss), Amount Ìý Ìý Ìý 0.0 Ìý Ìý
Stock and Other Incentive Plans Ìý Ìý 6.5 3.0 Ìý Ìý
Preferred share dividends Ìý Ìý Ìý (12.8) Ìý Ìý
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Ìý Ìý 0.0 Ìý Ìý Ìý
Undistributed Gains To Noncontrolling Interest Ìý Ìý 0.0 0.0 Ìý Ìý
Noncontrolling Interest [Member] Ìý Ìý Ìý Ìý Ìý Ìý
Stockholders' Equity Attributable to Noncontrolling Interest $ 151.8 $ 183.6 151.8 183.6 $ 169.8 $ (303.0)
INCOME (LOSS) ATTRIBUTABLE TO NONCONTROLLING INTEREST Ìý Ìý 25.5 3.1 Ìý Ìý
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest Ìý Ìý 1.3 (10.0) Ìý Ìý
OTHER COMPREHENSIVE LOSS (INCOME) ATTRIBUTABLE TO THE NONCONTROLLING INTEREST Ìý Ìý 26.8 (6.9) Ìý Ìý
Deconsolidation, Gain (Loss), Amount Ìý Ìý Ìý 528.2 Ìý Ìý
Stock and Other Incentive Plans Ìý Ìý 0.0 0.0 Ìý Ìý
Preferred share dividends Ìý Ìý Ìý 0.0 Ìý Ìý
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Ìý Ìý (41.4) Ìý Ìý Ìý
Undistributed Gains To Noncontrolling Interest Ìý Ìý (3.4) $ (34.7) Ìý Ìý
Common Stock [Member] Ìý Ìý Ìý Ìý Ìý Ìý
Stock Issued During Period, Value, New Issues Ìý Ìý 14.4 Ìý Ìý Ìý
Common Stock [Member] | Cliffs Shareholders Equity [Member] Ìý Ìý Ìý Ìý Ìý Ìý
Stock Issued During Period, Value, New Issues Ìý Ìý 14.4 Ìý Ìý Ìý
Common Stock [Member] | Noncontrolling Interest [Member] Ìý Ìý Ìý Ìý Ìý Ìý
Stock Issued During Period, Value, New Issues Ìý Ìý $ 0.0 Ìý Ìý Ìý