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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 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Stockholders' Equity Attributable to Parent $ (1,544.3) Ìý $ (1,544.3) Ìý $ (1,981.4) Ìý
Stockholders' Equity Attributable to Noncontrolling Interest 143.8 Ìý 143.8 Ìý 169.8 Ìý
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest (1,400.5) $ (1,759.5) (1,400.5) $ (1,759.5) (1,811.6) $ (1,734.3)
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS (25.8) 10.6 95.0 (689.0) Ìý Ìý
INCOME (LOSS) ATTRIBUTABLE TO NONCONTROLLING INTEREST (2.0) (4.6) 23.5 (1.5) Ìý Ìý
Net Income (Loss) (27.8) 6.0 118.5 (690.5) Ìý Ìý
Other Comprehensive Income (Loss), Net of Tax 8.7 4.5 19.0 211.4 Ìý Ìý
TOTAL COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS (18.0) 14.4 111.8 (468.3) Ìý Ìý
OTHER COMPREHENSIVE LOSS (INCOME) ATTRIBUTABLE TO THE NONCONTROLLING INTEREST 0.9 0.7 2.2 (9.3) Ìý Ìý
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Ìý Ìý 137.5 (479.1) Ìý Ìý
Deconsolidation, Gain (Loss), Amount Ìý Ìý Ìý 528.2 Ìý Ìý
Stock and Other Incentive Plans Ìý Ìý 10.1 6.0 Ìý Ìý
Preferred share dividends Ìý Ìý Ìý (38.4) Ìý Ìý
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Ìý Ìý (48.8) (40.7) Ìý Ìý
Undistributed Gains To Noncontrolling Interest Ìý Ìý (2.9) (1.2) Ìý Ìý
Cliffs Shareholders Equity [Member] Ìý Ìý Ìý Ìý Ìý Ìý
Stockholders' Equity Attributable to Parent (1,544.3) (1,932.0) (1,544.3) (1,932.0) (1,981.4) (1,431.3)
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS Ìý Ìý 95.0 (689.0) Ìý Ìý
Other comprehensive income (loss) Ìý Ìý 16.8 220.7 Ìý Ìý
TOTAL COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS Ìý Ìý 111.8 (468.3) Ìý Ìý
Deconsolidation, Gain (Loss), Amount Ìý Ìý Ìý 0.0 Ìý Ìý
Stock and Other Incentive Plans Ìý Ìý 10.1 6.0 Ìý Ìý
Preferred share dividends Ìý Ìý Ìý (38.4) Ìý Ìý
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Ìý Ìý 0.0 0.0 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 $ 143.8 $ 172.5 143.8 172.5 $ 169.8 $ (303.0)
INCOME (LOSS) ATTRIBUTABLE TO NONCONTROLLING INTEREST Ìý Ìý 23.5 (1.5) Ìý Ìý
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest Ìý Ìý 2.2 (9.3) Ìý Ìý
OTHER COMPREHENSIVE LOSS (INCOME) ATTRIBUTABLE TO THE NONCONTROLLING INTEREST Ìý Ìý 25.7 (10.8) 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 (48.8) (40.7) Ìý Ìý
Undistributed Gains To Noncontrolling Interest Ìý Ìý (2.9) $ (1.2) Ìý Ìý
Common Stock [Member] Ìý Ìý Ìý Ìý Ìý Ìý
Stock Issued During Period, Value, New Issues Ìý Ìý 315.2 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 315.2 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