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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, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
REVENUES FROM PRODUCT SALES AND SERVICES |  |  |  |  |  |  |  |  |  |  |
Product revenues |  |  |  |  |  |  |  |  | $ 2,172.3 | $ 1,644.6 | $ 1,379.7
Freight and Reimbursement Revenue |  |  |  |  |  |  |  |  | 160.1 | 221.4 | 174.8
TOTAL REVENUES FROM PRODUCT SALES AND SERVICES | $ 696.3 | $ 741.8 | $ 714.3 | $ 180.0 | $ 511.8 | $ 596.7 | $ 471.3 | $ 286.2 | 2,332.4 | 1,866.0 | 1,554.5
COST OF GOODS SOLD AND OPERATING EXPENSES |  |  |  |  |  |  |  |  | (1,522.8) | (1,398.4) | (1,274.4)
SALES MARGIN | 202.0 | 261.6 | 284.5 | 61.5 | 116.1 | 157.8 | 144.7 | 49.0 | 809.6 | 467.6 | 280.1
OTHER OPERATING INCOME (EXPENSE) |  |  |  |  |  |  |  |  |  |  |
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | (116.8) | (102.9) | (115.8)
Miscellaneous - net |  |  |  |  |  |  |  |  | (19.6) | 25.5 | (33.6)
Other operating expense |  |  |  |  |  |  |  |  | (136.4) | (77.4) | (149.4)
OPERATING INCOME |  |  |  |  |  |  |  |  | 673.2 | 390.2 | 130.7
OTHER INCOME (EXPENSE) |  |  |  |  |  |  |  |  |  |  |
Interest expense, net |  |  |  |  |  |  |  |  | (118.9) | (126.8) | (193.9)
Gain (loss) on extinguishment/restructuring of debt |  |  |  |  |  |  |  |  | (6.8) | (165.4) | 166.3
Other non-operating income |  |  |  |  |  |  |  |  | 17.2 | 10.2 | 7.3
TOTAL OTHER INCOME (EXPENSE) |  |  |  |  |  |  |  |  | (108.5) | (282.0) | (20.3)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES AND EQUITY LOSS FROM VENTURES |  |  |  |  |  |  |  |  | 564.7 | 108.2 | 110.4
INCOME TAX BENEFIT (EXPENSE) |  |  |  |  |  |  |  |  | 475.2 | 252.4 | 12.2
EQUITY IN INCOME OF SUBSIDIARIES |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
INCOME FROM CONTINUING OPERATIONS |  |  |  |  | 333.0 | 22.3 | 83.8 | (78.5) | 1,039.9 | 360.6 | 122.6
INCOME FROM DISCONTINUED OPERATIONS, net of tax |  |  |  |  |  |  |  |  | 88.2 | 2.5 | 76.7
NET INCOME |  |  |  |  |  |  |  |  | 1,128.1 | 363.1 | 199.3
INCOME ATTRIBUTABLE TO NONCONTROLLING INTEREST |  |  |  |  |  |  |  |  | 0.0 | 3.9 | (25.2)
NET INCOME ATTRIBUTABLE TO CLIFFS SHAREHOLDERS | $ 609.5 | $ 437.8 | $ 165.1 | $ (84.3) | $ 309.9 | $ 53.4 | $ 31.8 | $ (28.1) | 1,128.1 | 367.0 | 174.1
OTHER COMPREHENSIVE INCOME (LOSS) |  |  |  |  |  |  |  |  | (244.9) | (4.0) | (3.3)
TOTAL COMPREHENSIVE INCOME ATTRIBUTABLE TO CLIFFS SHAREHOLDERS |  |  |  |  |  |  |  |  | 883.2 | 363.0 | 170.8
Consolidation, Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
REVENUES FROM PRODUCT SALES AND SERVICES |  |  |  |  |  |  |  |  |  |  |
Product revenues |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Freight and Reimbursement Revenue |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
TOTAL REVENUES FROM PRODUCT SALES AND SERVICES |  |  |  |  |  |  |  |  | 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 |  |  |  |  |  |  |  |  | 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 (EXPENSE) |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
EQUITY IN INCOME OF SUBSIDIARIES |  |  |  |  |  |  |  |  | (883.7) | (524.4) | (332.8)
INCOME FROM CONTINUING OPERATIONS |  |  |  |  |  |  |  |  | (883.7) | (524.4) | (332.8)
INCOME FROM DISCONTINUED OPERATIONS, net of tax |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
NET INCOME |  |  |  |  |  |  |  |  |  | (524.4) | (332.8)
INCOME ATTRIBUTABLE TO NONCONTROLLING INTEREST |  |  |  |  |  |  |  |  |  | 0.0 | 0.0
NET INCOME ATTRIBUTABLE TO CLIFFS SHAREHOLDERS |  |  |  |  |  |  |  |  | (883.7) | (524.4) | (332.8)
OTHER COMPREHENSIVE INCOME (LOSS) |  |  |  |  |  |  |  |  | 280.8 | (8.1) | 5.3
TOTAL COMPREHENSIVE INCOME ATTRIBUTABLE TO CLIFFS SHAREHOLDERS |  |  |  |  |  |  |  |  | (602.9) | (532.5) | (327.5)
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member] |  |  |  |  |  |  |  |  |  |  |
REVENUES FROM PRODUCT SALES AND SERVICES |  |  |  |  |  |  |  |  |  |  |
Product revenues |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Freight and Reimbursement Revenue |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
TOTAL REVENUES FROM PRODUCT SALES AND SERVICES |  |  |  |  |  |  |  |  | 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 |  |  |  |  |  |  |  |  | (0.3) | (5.8) | (3.5)
Miscellaneous - net |  |  |  |  |  |  |  |  | 4.3 | 16.8 | (15.6)
Other operating expense |  |  |  |  |  |  |  |  | 4.0 | 11.0 | (19.1)
OPERATING INCOME |  |  |  |  |  |  |  |  | 4.0 | 11.0 | (19.1)
OTHER INCOME (EXPENSE) |  |  |  |  |  |  |  |  |  |  |
Interest expense, net |  |  |  |  |  |  |  |  | 0.8 | 1.0 | 0.5
Gain (loss) on extinguishment/restructuring of debt |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Other non-operating income |  |  |  |  |  |  |  |  | 19.8 | 17.2 | 16.4
TOTAL OTHER INCOME (EXPENSE) |  |  |  |  |  |  |  |  | 20.6 | 18.2 | 16.9
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES AND EQUITY LOSS FROM VENTURES |  |  |  |  |  |  |  |  | 24.6 | 29.2 | (2.2)
INCOME TAX BENEFIT (EXPENSE) |  |  |  |  |  |  |  |  | 0.5 | (0.3) | 4.9
EQUITY IN INCOME OF SUBSIDIARIES |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
INCOME FROM CONTINUING OPERATIONS |  |  |  |  |  |  |  |  | 25.1 | 28.9 | 2.7
INCOME FROM DISCONTINUED OPERATIONS, net of tax |  |  |  |  |  |  |  |  | 66.4 | 22.1 | 91.2
NET INCOME |  |  |  |  |  |  |  |  |  | 51.0 | 93.9
INCOME ATTRIBUTABLE TO NONCONTROLLING INTEREST |  |  |  |  |  |  |  |  |  | 0.0 | 0.0
NET INCOME ATTRIBUTABLE TO CLIFFS SHAREHOLDERS |  |  |  |  |  |  |  |  | 91.5 | 51.0 | 93.9
OTHER COMPREHENSIVE INCOME (LOSS) |  |  |  |  |  |  |  |  | (256.7) | (4.8) | 15.4
TOTAL COMPREHENSIVE INCOME ATTRIBUTABLE TO CLIFFS SHAREHOLDERS |  |  |  |  |  |  |  |  | (165.2) | 46.2 | 109.3
Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member] |  |  |  |  |  |  |  |  |  |  |
REVENUES FROM PRODUCT SALES AND SERVICES |  |  |  |  |  |  |  |  |  |  |
Product revenues |  |  |  |  |  |  |  |  | 2,172.3 | 1,644.6 | 1,379.7
Freight and Reimbursement Revenue |  |  |  |  |  |  |  |  | 160.1 | 221.4 | 174.8
TOTAL REVENUES FROM PRODUCT SALES AND SERVICES |  |  |  |  |  |  |  |  | 2,332.4 | 1,866.0 | 1,554.5
COST OF GOODS SOLD AND OPERATING EXPENSES |  |  |  |  |  |  |  |  | (1,522.8) | (1,398.4) | (1,274.4)
SALES MARGIN |  |  |  |  |  |  |  |  | 809.6 | 467.6 | 280.1
OTHER OPERATING INCOME (EXPENSE) |  |  |  |  |  |  |  |  |  |  |
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | (30.4) | (19.9) | (18.0)
Miscellaneous - net |  |  |  |  |  |  |  |  | (23.6) | 11.0 | (12.4)
Other operating expense |  |  |  |  |  |  |  |  | (54.0) | (8.9) | (30.4)
OPERATING INCOME |  |  |  |  |  |  |  |  | 755.6 | 458.7 | 249.7
OTHER INCOME (EXPENSE) |  |  |  |  |  |  |  |  |  |  |
Interest expense, net |  |  |  |  |  |  |  |  | (2.1) | (1.0) | 0.1
Gain (loss) on extinguishment/restructuring of debt |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Other non-operating income |  |  |  |  |  |  |  |  | 0.9 | (3.0) | (5.0)
TOTAL OTHER INCOME (EXPENSE) |  |  |  |  |  |  |  |  | (1.2) | (4.0) | (4.9)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES AND EQUITY LOSS FROM VENTURES |  |  |  |  |  |  |  |  | 754.4 | 454.7 | 244.8
INCOME TAX BENEFIT (EXPENSE) |  |  |  |  |  |  |  |  | 0.0 | 1.3 | 3.0
EQUITY IN INCOME OF SUBSIDIARIES |  |  |  |  |  |  |  |  | 25.5 | 11.8 | 13.7
INCOME FROM CONTINUING OPERATIONS |  |  |  |  |  |  |  |  | 779.9 | 467.8 | 261.5
INCOME FROM DISCONTINUED OPERATIONS, net of tax |  |  |  |  |  |  |  |  | 12.3 | 1.7 | 2.6
NET INCOME |  |  |  |  |  |  |  |  |  | 469.5 | 264.1
INCOME ATTRIBUTABLE TO NONCONTROLLING INTEREST |  |  |  |  |  |  |  |  |  | 3.9 | (25.2)
NET INCOME ATTRIBUTABLE TO CLIFFS SHAREHOLDERS |  |  |  |  |  |  |  |  | 792.2 | 473.4 | 238.9
OTHER COMPREHENSIVE INCOME (LOSS) |  |  |  |  |  |  |  |  | (24.1) | 12.9 | (20.7)
TOTAL COMPREHENSIVE INCOME ATTRIBUTABLE TO CLIFFS SHAREHOLDERS |  |  |  |  |  |  |  |  | 768.1 | 486.3 | 218.2
Parent [Member] | Reportable Legal Entities [Member] |  |  |  |  |  |  |  |  |  |  |
REVENUES FROM PRODUCT SALES AND SERVICES |  |  |  |  |  |  |  |  |  |  |
Product revenues |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Freight and Reimbursement Revenue |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
TOTAL REVENUES FROM PRODUCT SALES AND SERVICES |  |  |  |  |  |  |  |  | 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 |  |  |  |  |  |  |  |  | (86.1) | (77.2) | (94.3)
Miscellaneous - net |  |  |  |  |  |  |  |  | (0.3) | (2.3) | (5.6)
Other operating expense |  |  |  |  |  |  |  |  | (86.4) | (79.5) | (99.9)
OPERATING INCOME |  |  |  |  |  |  |  |  | (86.4) | (79.5) | (99.9)
OTHER INCOME (EXPENSE) |  |  |  |  |  |  |  |  |  |  |
Interest expense, net |  |  |  |  |  |  |  |  | (117.6) | (126.8) | (194.5)
Gain (loss) on extinguishment/restructuring of debt |  |  |  |  |  |  |  |  | (6.8) | (165.4) | 166.3
Other non-operating income |  |  |  |  |  |  |  |  | (3.5) | (4.0) | (4.1)
TOTAL OTHER INCOME (EXPENSE) |  |  |  |  |  |  |  |  | (127.9) | (296.2) | (32.3)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES AND EQUITY LOSS FROM VENTURES |  |  |  |  |  |  |  |  | (214.3) | (375.7) | (132.2)
INCOME TAX BENEFIT (EXPENSE) |  |  |  |  |  |  |  |  | 474.7 | 251.4 | 4.3
EQUITY IN INCOME OF SUBSIDIARIES |  |  |  |  |  |  |  |  | 858.2 | 512.6 | 319.1
INCOME FROM CONTINUING OPERATIONS |  |  |  |  |  |  |  |  | 1,118.6 | 388.3 | 191.2
INCOME FROM DISCONTINUED OPERATIONS, net of tax |  |  |  |  |  |  |  |  | 9.5 | (21.3) | (17.1)
NET INCOME |  |  |  |  |  |  |  |  |  | 367.0 | 174.1
INCOME ATTRIBUTABLE TO NONCONTROLLING INTEREST |  |  |  |  |  |  |  |  |  | 0.0 | 0.0
NET INCOME ATTRIBUTABLE TO CLIFFS SHAREHOLDERS |  |  |  |  |  |  |  |  | 1,128.1 | 367.0 | 174.1
OTHER COMPREHENSIVE INCOME (LOSS) |  |  |  |  |  |  |  |  | (244.9) | (4.0) | (3.3)
TOTAL COMPREHENSIVE INCOME ATTRIBUTABLE TO CLIFFS SHAREHOLDERS |  |  |  |  |  |  |  |  | $ 883.2 | $ 363.0 | $ 170.8

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