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SUPPLEMENTARY GUARANTOR INFORMATION (Supplementary Statements of Condensed Consolidating Operations and Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Sep. 30, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
REVENUES FROM PRODUCT SALES AND SERVICES |  |  |  |  |  |  |  |  |  |  |  |
Product |  |  |  |  |  |  |  |  |  | $ 2,089.2 | $ 1,913.5 | $ 1,832.4
Freight and venture partners' cost reimbursements |  |  |  |  |  |  |  |  |  | 241.0 | 195.5 | 180.9
TOTAL REVENUES | $ 600.9 | $ 698.4 | $ 569.3 | $ 461.6 | $ 754.0 | $ 553.3 | $ 496.2 | $ 305.5 |  | 2,330.2 | 2,109.0 | 2,013.3
COST OF GOODS SOLD AND OPERATING EXPENSES |  |  |  |  |  |  |  |  |  | (1,828.5) | (1,719.7) | (1,776.8)
SALES MARGIN | 100.7 | 160.2 | 145.1 | 95.7 | 181.5 | 85.4 | 91.5 | 30.9 |  | 501.7 | 389.3 | 236.5
OTHER OPERATING INCOME (EXPENSE) |  |  |  |  |  |  |  |  |  |  |  |
Selling, general and administrative expenses |  |  |  |  |  |  |  |  |  | (105.8) | (117.8) | (110.0)
Miscellaneous - net |  |  |  |  |  |  |  |  |  | 27.7 | (30.7) | 24.8
Other operating expense |  |  |  |  |  |  |  |  |  | (78.1) | (148.5) | (85.2)
OPERATING INCOME |  |  |  |  |  |  |  |  |  | 423.6 | 240.8 | 151.3
OTHER INCOME (EXPENSE) |  |  |  |  |  |  |  |  |  |  |  |
Interest expense, net |  |  |  |  |  |  |  |  |  | (132.0) | (200.5) | (228.5)
Gain (loss) on extinguishment/restructuring of debt |  |  |  |  |  |  |  | 174.3 |  | (165.4) | 166.3 | 392.9
Other non-operating income (expense) |  |  |  |  |  |  |  |  |  | 3.2 | 0.4 | (2.6)
TOTAL OTHER INCOME (EXPENSE) |  |  |  |  |  |  |  |  |  | (294.2) | (33.8) | 161.8
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES AND EQUITY LOSS FROM VENTURES |  |  |  |  |  |  |  |  |  | 129.4 | 207.0 | 313.1
INCOME TAX BENEFIT |  |  |  |  |  |  |  |  |  | 252.4 | 12.2 | (169.3)
EQUITY IN INCOME OF SUBSIDIARIES |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
EQUITY LOSS FROM VENTURES, net of tax |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | (0.1)
INCOME FROM CONTINUING OPERATIONS | 315.0 | 20.6 | 76.5 | (30.3) | $ 100.1 | (25.1) | 29.9 | 114.3 |  | 381.8 | 219.2 | 143.7
LOSS FROM DISCONTINUED OPERATIONS, net of tax |  |  |  |  |  |  |  |  |  | (18.7) | (19.9) | (892.1)
NET INCOME (LOSS) |  |  |  |  |  |  |  |  |  | 363.1 | 199.3 | (748.4)
INCOME ATTRIBUTABLE TO NONCONTROLLING INTEREST |  |  |  |  |  |  |  |  |  | 3.9 | (25.2) | (0.9)
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS | $ 309.9 | $ 53.4 | $ 31.8 | $ (28.1) |  | $ (25.8) | $ 12.8 | $ 108.0 | $ 79.1 | 367.0 | 174.1 | (749.3)
PREFERRED STOCK DIVIDENDS |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | (38.4)
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS COMMON SHAREHOLDERS |  |  |  |  |  |  |  |  |  | 367.0 | 174.1 | (787.7)
OTHER COMPREHENSIVE INCOME |  |  |  |  |  |  |  |  |  | (4.0) | (3.3) | 266.2
TOTAL COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS |  |  |  |  |  |  |  |  |  | 363.0 | 170.8 | (521.5)
Consolidation, Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |  |
REVENUES FROM PRODUCT SALES AND SERVICES |  |  |  |  |  |  |  |  |  |  |  |
Product |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Freight and venture partners' cost reimbursements |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
TOTAL REVENUES |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
COST OF GOODS SOLD AND OPERATING EXPENSES |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
SALES MARGIN |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
OTHER OPERATING INCOME (EXPENSE) |  |  |  |  |  |  |  |  |  |  |  |
Selling, general and administrative expenses |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Miscellaneous - net |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Other operating expense |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
OPERATING INCOME |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
OTHER INCOME (EXPENSE) |  |  |  |  |  |  |  |  |  |  |  |
Interest expense, net |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Gain (loss) on extinguishment/restructuring of debt |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Other non-operating income (expense) |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
TOTAL OTHER INCOME (EXPENSE) |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES AND EQUITY LOSS FROM VENTURES |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
INCOME TAX BENEFIT |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
EQUITY IN INCOME OF SUBSIDIARIES |  |  |  |  |  |  |  |  |  | (524.4) | (333.3) | 488.3
EQUITY LOSS FROM VENTURES, net of tax |  |  |  |  |  |  |  |  |  |  |  | 0.0
INCOME FROM CONTINUING OPERATIONS |  |  |  |  |  |  |  |  |  | (524.4) | (333.3) | 488.3
LOSS FROM DISCONTINUED OPERATIONS, net of tax |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
NET INCOME (LOSS) |  |  |  |  |  |  |  |  |  | (524.4) | (333.3) | 488.3
INCOME ATTRIBUTABLE TO NONCONTROLLING INTEREST |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS |  |  |  |  |  |  |  |  |  | (524.4) | (333.3) | 488.3
PREFERRED STOCK DIVIDENDS |  |  |  |  |  |  |  |  |  |  |  | 0.0
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS COMMON SHAREHOLDERS |  |  |  |  |  |  |  |  |  |  |  | 488.3
OTHER COMPREHENSIVE INCOME |  |  |  |  |  |  |  |  |  | (7.6) | 6.9 | (196.4)
TOTAL COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS |  |  |  |  |  |  |  |  |  | (532.0) | (326.4) | 291.9
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member] |  |  |  |  |  |  |  |  |  |  |  |
REVENUES FROM PRODUCT SALES AND SERVICES |  |  |  |  |  |  |  |  |  |  |  |
Product |  |  |  |  |  |  |  |  |  | 444.6 | 533.9 | 464.3
Freight and venture partners' cost reimbursements |  |  |  |  |  |  |  |  |  | 19.6 | 20.6 | 23.6
TOTAL REVENUES |  |  |  |  |  |  |  |  |  | 464.2 | 554.5 | 487.9
COST OF GOODS SOLD AND OPERATING EXPENSES |  |  |  |  |  |  |  |  |  | (427.9) | (440.9) | (478.5)
SALES MARGIN |  |  |  |  |  |  |  |  |  | 36.3 | 113.6 | 9.4
OTHER OPERATING INCOME (EXPENSE) |  |  |  |  |  |  |  |  |  |  |  |
Selling, general and administrative expenses |  |  |  |  |  |  |  |  |  | 0.3 | 0.9 | (0.3)
Miscellaneous - net |  |  |  |  |  |  |  |  |  | 17.6 | (14.3) | 20.1
Other operating expense |  |  |  |  |  |  |  |  |  | 17.9 | (13.4) | 19.8
OPERATING INCOME |  |  |  |  |  |  |  |  |  | 54.2 | 100.2 | 29.2
OTHER INCOME (EXPENSE) |  |  |  |  |  |  |  |  |  |  |  |
Interest expense, net |  |  |  |  |  |  |  |  |  | (4.2) | (6.1) | (7.0)
Gain (loss) on extinguishment/restructuring of debt |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Other non-operating income (expense) |  |  |  |  |  |  |  |  |  | 0.0 | 0.5 | 110.8
TOTAL OTHER INCOME (EXPENSE) |  |  |  |  |  |  |  |  |  | (4.2) | (5.6) | 103.8
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES AND EQUITY LOSS FROM VENTURES |  |  |  |  |  |  |  |  |  | 50.0 | 94.6 | 133.0
INCOME TAX BENEFIT |  |  |  |  |  |  |  |  |  | (0.3) | 4.9 | 26.1
EQUITY IN INCOME OF SUBSIDIARIES |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
EQUITY LOSS FROM VENTURES, net of tax |  |  |  |  |  |  |  |  |  |  |  | (0.1)
INCOME FROM CONTINUING OPERATIONS |  |  |  |  |  |  |  |  |  | 49.7 | 99.5 | 159.0
LOSS FROM DISCONTINUED OPERATIONS, net of tax |  |  |  |  |  |  |  |  |  | 0.9 | (5.4) | 75.2
NET INCOME (LOSS) |  |  |  |  |  |  |  |  |  | 50.6 | 94.1 | 234.2
INCOME ATTRIBUTABLE TO NONCONTROLLING INTEREST |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 7.7
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS |  |  |  |  |  |  |  |  |  | 50.6 | 94.1 | 241.9
PREFERRED STOCK DIVIDENDS |  |  |  |  |  |  |  |  |  |  |  | 0.0
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS COMMON SHAREHOLDERS |  |  |  |  |  |  |  |  |  |  |  | 241.9
OTHER COMPREHENSIVE INCOME |  |  |  |  |  |  |  |  |  | (5.2) | 13.8 | 176.4
TOTAL COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS |  |  |  |  |  |  |  |  |  | 45.4 | 107.9 | 418.3
Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member] |  |  |  |  |  |  |  |  |  |  |  |
REVENUES FROM PRODUCT SALES AND SERVICES |  |  |  |  |  |  |  |  |  |  |  |
Product |  |  |  |  |  |  |  |  |  | 1,644.6 | 1,379.6 | 1,368.1
Freight and venture partners' cost reimbursements |  |  |  |  |  |  |  |  |  | 221.4 | 174.9 | 157.3
TOTAL REVENUES |  |  |  |  |  |  |  |  |  | 1,866.0 | 1,554.5 | 1,525.4
COST OF GOODS SOLD AND OPERATING EXPENSES |  |  |  |  |  |  |  |  |  | (1,400.6) | (1,278.8) | (1,298.3)
SALES MARGIN |  |  |  |  |  |  |  |  |  | 465.4 | 275.7 | 227.1
OTHER OPERATING INCOME (EXPENSE) |  |  |  |  |  |  |  |  |  |  |  |
Selling, general and administrative expenses |  |  |  |  |  |  |  |  |  | (24.7) | (20.8) | (21.2)
Miscellaneous - net |  |  |  |  |  |  |  |  |  | 12.3 | (10.8) | (3.0)
Other operating expense |  |  |  |  |  |  |  |  |  | (12.4) | (31.6) | (24.2)
OPERATING INCOME |  |  |  |  |  |  |  |  |  | 453.0 | 244.1 | 202.9
OTHER INCOME (EXPENSE) |  |  |  |  |  |  |  |  |  |  |  |
Interest expense, net |  |  |  |  |  |  |  |  |  | (1.0) | 0.6 | (0.1)
Gain (loss) on extinguishment/restructuring of debt |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Other non-operating income (expense) |  |  |  |  |  |  |  |  |  | 3.1 | 0.4 | 1.2
TOTAL OTHER INCOME (EXPENSE) |  |  |  |  |  |  |  |  |  | 2.1 | 1.0 | 1.1
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES AND EQUITY LOSS FROM VENTURES |  |  |  |  |  |  |  |  |  | 455.1 | 245.1 | 204.0
INCOME TAX BENEFIT |  |  |  |  |  |  |  |  |  | 1.3 | 3.0 | (176.3)
EQUITY IN INCOME OF SUBSIDIARIES |  |  |  |  |  |  |  |  |  | 11.8 | 13.7 | 12.9
EQUITY LOSS FROM VENTURES, net of tax |  |  |  |  |  |  |  |  |  |  |  | 0.0
INCOME FROM CONTINUING OPERATIONS |  |  |  |  |  |  |  |  |  | 468.2 | 261.8 | 40.6
LOSS FROM DISCONTINUED OPERATIONS, net of tax |  |  |  |  |  |  |  |  |  | 1.7 | 2.6 | (762.2)
NET INCOME (LOSS) |  |  |  |  |  |  |  |  |  | 469.9 | 264.4 | (721.6)
INCOME ATTRIBUTABLE TO NONCONTROLLING INTEREST |  |  |  |  |  |  |  |  |  | 3.9 | (25.2) | (8.6)
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS |  |  |  |  |  |  |  |  |  | 473.8 | 239.2 | (730.2)
PREFERRED STOCK DIVIDENDS |  |  |  |  |  |  |  |  |  |  |  | 0.0
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS COMMON SHAREHOLDERS |  |  |  |  |  |  |  |  |  |  |  | (730.2)
OTHER COMPREHENSIVE INCOME |  |  |  |  |  |  |  |  |  | 12.8 | (20.7) | 20.0
TOTAL COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS |  |  |  |  |  |  |  |  |  | 486.6 | 218.5 | (710.2)
Parent [Member] | Reportable Legal Entities [Member] |  |  |  |  |  |  |  |  |  |  |  |
REVENUES FROM PRODUCT SALES AND SERVICES |  |  |  |  |  |  |  |  |  |  |  |
Product |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Freight and venture partners' cost reimbursements |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
TOTAL REVENUES |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
COST OF GOODS SOLD AND OPERATING EXPENSES |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
SALES MARGIN |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
OTHER OPERATING INCOME (EXPENSE) |  |  |  |  |  |  |  |  |  |  |  |
Selling, general and administrative expenses |  |  |  |  |  |  |  |  |  | (81.4) | (97.9) | (88.5)
Miscellaneous - net |  |  |  |  |  |  |  |  |  | (2.2) | (5.6) | 7.7
Other operating expense |  |  |  |  |  |  |  |  |  | (83.6) | (103.5) | (80.8)
OPERATING INCOME |  |  |  |  |  |  |  |  |  | (83.6) | (103.5) | (80.8)
OTHER INCOME (EXPENSE) |  |  |  |  |  |  |  |  |  |  |  |
Interest expense, net |  |  |  |  |  |  |  |  |  | (126.8) | (195.0) | (221.4)
Gain (loss) on extinguishment/restructuring of debt |  |  |  |  |  |  |  |  |  | (165.4) | 166.3 | 392.9
Other non-operating income (expense) |  |  |  |  |  |  |  |  |  | 0.1 | (0.5) | (114.6)
TOTAL OTHER INCOME (EXPENSE) |  |  |  |  |  |  |  |  |  | (292.1) | (29.2) | 56.9
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES AND EQUITY LOSS FROM VENTURES |  |  |  |  |  |  |  |  |  | (375.7) | (132.7) | (23.9)
INCOME TAX BENEFIT |  |  |  |  |  |  |  |  |  | 251.4 | 4.3 | (19.1)
EQUITY IN INCOME OF SUBSIDIARIES |  |  |  |  |  |  |  |  |  | 512.6 | 319.6 | (501.2)
EQUITY LOSS FROM VENTURES, net of tax |  |  |  |  |  |  |  |  |  |  |  | 0.0
INCOME FROM CONTINUING OPERATIONS |  |  |  |  |  |  |  |  |  | 388.3 | 191.2 | (544.2)
LOSS FROM DISCONTINUED OPERATIONS, net of tax |  |  |  |  |  |  |  |  |  | (21.3) | (17.1) | (205.1)
NET INCOME (LOSS) |  |  |  |  |  |  |  |  |  | 367.0 | 174.1 | (749.3)
INCOME ATTRIBUTABLE TO NONCONTROLLING INTEREST |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS |  |  |  |  |  |  |  |  |  | 367.0 | 174.1 | (749.3)
PREFERRED STOCK DIVIDENDS |  |  |  |  |  |  |  |  |  |  |  | (38.4)
NET INCOME (LOSS) ATTRIBUTABLE TO CLIFFS COMMON SHAREHOLDERS |  |  |  |  |  |  |  |  |  |  |  | (787.7)
OTHER COMPREHENSIVE INCOME |  |  |  |  |  |  |  |  |  | (4.0) | (3.3) | 266.2
TOTAL COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO CLIFFS SHAREHOLDERS |  |  |  |  |  |  |  |  |  | $ 363.0 | $ 170.8 | $ (521.5)

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