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Quarterly report pursuant to Section 13 or 15(d)

SHAREHOLDERS' EQUITY Schedule of Shareholders' Equity (Details)

v3.8.0.1
SHAREHOLDERS' EQUITY Schedule of Shareholders' Equity (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Stockholders' Equity Attributable to Parent $ (833.3) Ìý $ (833.3) Ìý $ (1,464.3) Ìý
Stockholders' Equity Attributable to Noncontrolling Interest 0.2 Ìý 0.2 Ìý 133.8 Ìý
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest (833.1) $ (1,400.5) (833.1) $ (1,400.5) (1,330.5) $ (1,811.6)
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS 53.4 (25.8) 57.1 95.0 Ìý Ìý
Net Income (Loss) Attributable to Noncontrolling Interest (0.5) (2.0) (3.9) 23.5 Ìý Ìý
Net Income (Loss) 52.9 (27.8) 53.2 118.5 Ìý Ìý
Other comprehensive income (loss) 55.7 (18.0) 61.3 111.8 Ìý Ìý
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest 5.7 0.9 1.1 2.2 Ìý Ìý
Other Comprehensive Income (Loss), Net of Tax 8.0 8.7 5.3 19.0 Ìý Ìý
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Ìý Ìý 58.5 137.5 Ìý Ìý
Stock and Other Incentive Plans Ìý Ìý 13.5 10.1 Ìý Ìý
Distributions to partnership equity Ìý Ìý Ìý (48.8) Ìý Ìý
Distributions to noncontrolling interest Ìý Ìý 1.8 (2.9) Ìý Ìý
Cliffs Shareholders Equity [Member] Ìý Ìý Ìý Ìý Ìý Ìý
Stockholders' Equity Attributable to Parent (833.3) (1,544.3) (833.3) (1,544.3) (1,464.3) (1,981.4)
Net Income (Loss) Available to Common Stockholders, Basic Ìý Ìý 57.1 95.0 Ìý Ìý
Other comprehensive income (loss) Ìý Ìý 4.2 16.8 Ìý Ìý
TOTAL COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS Ìý Ìý 61.3 111.8 Ìý Ìý
Stock and Other Incentive Plans Ìý Ìý 13.5 10.1 Ìý Ìý
Distributions to partnership equity Ìý Ìý Ìý 0.0 Ìý Ìý
Distributions 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 0.2 $ 143.8 0.2 143.8 $ 133.8 $ 169.8
Net Income (Loss) Attributable to Noncontrolling Interest Ìý Ìý (3.9) 23.5 Ìý Ìý
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest Ìý Ìý 1.1 2.2 Ìý Ìý
OTHER COMPREHENSIVE LOSS (INCOME) ATTRIBUTABLE TO THE NONCONTROLLING INTEREST Ìý Ìý (2.8) 25.7 Ìý Ìý
Stock and Other Incentive Plans Ìý Ìý 0.0 0.0 Ìý Ìý
Distributions to partnership equity Ìý Ìý Ìý (48.8) Ìý Ìý
Distributions to noncontrolling interest Ìý Ìý 1.8 (2.9) Ìý Ìý
Common Stock [Member] Ìý Ìý Ìý Ìý Ìý Ìý
Stock Issued During Period, Value, New Issues Ìý Ìý 661.3 315.2 Ìý Ìý
Common Stock [Member] | Cliffs Shareholders Equity [Member] Ìý Ìý Ìý Ìý Ìý Ìý
Stock Issued During Period, Value, New Issues Ìý Ìý 661.3 315.2 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 $ 0.0 Ìý Ìý
Tilden [Member] Ìý Ìý Ìý Ìý Ìý Ìý
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests 15.9 Ìý (105.0) Ìý Ìý Ìý
Tilden [Member] | Cliffs Shareholders Equity [Member] Ìý Ìý Ìý Ìý Ìý Ìý
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests Ìý Ìý (89.1) Ìý Ìý Ìý
Tilden [Member] | Noncontrolling Interest [Member] Ìý Ìý Ìý Ìý Ìý Ìý
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests Ìý Ìý (15.9) Ìý Ìý Ìý
Empire [Member] Ìý Ìý Ìý Ìý Ìý Ìý
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests $ 116.7 Ìý (132.7) Ìý Ìý Ìý
Empire [Member] | Cliffs Shareholders Equity [Member] Ìý Ìý Ìý Ìý Ìý Ìý
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests Ìý Ìý (16.0) Ìý Ìý Ìý
Empire [Member] | Noncontrolling Interest [Member] Ìý Ìý Ìý Ìý Ìý Ìý
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests Ìý Ìý $ (116.7) Ìý Ìý Ìý