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SUPPLEMENTARY GUARANTOR INFORMATION (Supplementary Statements of Condensed Consolidating Operations and Comprehensive Income) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Product Revenue | $ 697.4 |  | $ 672.0 |  | $ 842.8 | $ 841.2
Freight Revenue | 45.8 |  | 42.3 |  | 57.4 | 53.1
Revenues | 743.2 |  | 714.3 |  | 900.2 | 894.3
COST OF GOODS SOLD | (480.2) |  | (429.8) |  | (606.3) | (548.3)
SALES MARGIN | 263.0 |  | 284.5 |  | 293.9 | 346.0
Selling, general and administrative expenses | (30.6) |  | (26.2) |  | (58.7) | (51.3)
Miscellaneous - net | (5.6) |  | (4.1) |  | (9.2) | (10.2)
Other operating expense | (36.2) |  | (30.3) |  | (67.9) | (61.5)
OPERATING INCOME (LOSS) | 226.8 |  | 254.2 |  | 226.0 | 284.5
Interest expense, net | (26.1) |  | (31.2) |  | (51.2) | (63.6)
Gain (loss) on extinguishment of debt | (17.9) |  | 0.2 |  | (18.2) | 0.2
Other non-operating income (expense) | 0.6 |  | 4.4 |  | 1.0 | 8.8
TOTAL OTHER INCOME (EXPENSE) | (43.4) |  | (26.6) |  | (68.4) | (54.6)
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES | 183.4 |  | 227.6 |  | 157.6 | 229.9
Income tax benefit (expense) | 22.0 |  | (1.8) |  | 18.3 | 13.9
EQUITY IN INCOME OF SUBSIDIARIES | 0.0 |  | 0.0 |  | 0.0 | 0.0
INCOME FROM CONTINUING OPERATIONS | 161.4 |  | 229.4 |  | 139.3 | 216.0
Income (loss) from discontinued operations, net of tax | (0.6) |  | (64.3) |  | (0.6) | (135.2)
NET INCOME (LOSS) | 160.8 | $ (22.1) | 165.1 | $ (84.3) | 138.7 | 80.8
Other Comprehensive Income (Loss), Net of Tax | 3.7 | 8.4 | 9.1 | $ 7.7 | 12.1 | 16.8
TOTAL COMPREHENSIVE INCOME (LOSS) | 164.5 | $ (13.7) | 174.2 |  | 150.8 | 97.6
Reportable Legal Entities [Member] | Cliffs Shareholders Equity [Member] |  |  |  |  |  |
Product Revenue | 0.0 |  | 0.0 |  | 0.0 | 0.0
Freight Revenue | 0.0 |  | 0.0 |  | 0.0 | 0.0
Revenues | 0.0 |  | 0.0 |  | 0.0 | 0.0
COST OF GOODS SOLD | 0.0 |  | 0.0 |  | 0.0 | 0.0
SALES MARGIN | 0.0 |  | 0.0 |  | 0.0 | 0.0
Selling, general and administrative expenses | (23.6) |  | (19.7) |  | (46.4) | (39.8)
Miscellaneous - net | 0.0 |  | (0.2) |  | 0.0 | (0.4)
Other operating expense | (23.6) |  | (19.9) |  | (46.4) | (40.2)
OPERATING INCOME (LOSS) | (23.6) |  | (19.9) |  | (46.4) | (40.2)
Interest expense, net | (25.4) |  | (30.8) |  | (50.1) | (62.7)
Gain (loss) on extinguishment of debt | (17.9) |  | 0.2 |  | (18.2) | 0.2
Other non-operating income (expense) | (1.0) |  | (0.8) |  | (2.1) | (1.7)
TOTAL OTHER INCOME (EXPENSE) | (44.3) |  | (31.4) |  | (70.4) | (64.2)
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES | (67.9) |  | (51.3) |  | (116.8) | (104.4)
Income tax benefit (expense) | 21.8 |  | (2.1) |  | 17.9 | 13.5
EQUITY IN INCOME OF SUBSIDIARIES | 250.4 |  | 210.4 |  | 273.3 | 194.7
INCOME FROM CONTINUING OPERATIONS | 160.7 |  | 161.2 |  | 138.6 | 76.8
Income (loss) from discontinued operations, net of tax | 0.1 |  | 3.9 |  | 0.1 | 4.0
NET INCOME (LOSS) | 160.8 |  | 165.1 |  | 138.7 | 80.8
Other Comprehensive Income (Loss), Net of Tax | 3.7 |  | 9.1 |  | 12.1 | 16.8
TOTAL COMPREHENSIVE INCOME (LOSS) | 164.5 |  | 174.2 |  | 150.8 | 97.6
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member] |  |  |  |  |  |
Product Revenue | 697.4 |  | 672.0 |  | 842.8 | 841.2
Freight Revenue | 45.8 |  | 42.3 |  | 57.4 | 53.1
Revenues | 743.2 |  | 714.3 |  | 900.2 | 894.3
COST OF GOODS SOLD | (480.2) |  | (429.8) |  | (606.3) | (548.3)
SALES MARGIN | 263.0 |  | 284.5 |  | 293.9 | 346.0
Selling, general and administrative expenses | (6.8) |  | (6.4) |  | (12.0) | (11.1)
Miscellaneous - net | (4.8) |  | (3.6) |  | (8.2) | (8.9)
Other operating expense | (11.6) |  | (10.0) |  | (20.2) | (20.0)
OPERATING INCOME (LOSS) | 251.4 |  | 274.5 |  | 273.7 | 326.0
Interest expense, net | (0.8) |  | (0.6) |  | (1.3) | (1.4)
Gain (loss) on extinguishment of debt | 0.0 |  | 0.0 |  | 0.0 | 0.0
Other non-operating income (expense) | (3.2) |  | 0.2 |  | (6.4) | 0.7
TOTAL OTHER INCOME (EXPENSE) | (4.0) |  | (0.4) |  | (7.7) | (0.7)
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES | 247.4 |  | 274.1 |  | 266.0 | 325.3
Income tax benefit (expense) | 0.2 |  | 0.1 |  | 0.3 | 0.2
EQUITY IN INCOME OF SUBSIDIARIES | 4.3 |  | 4.6 |  | 8.7 | 9.1
INCOME FROM CONTINUING OPERATIONS | 251.5 |  | 278.6 |  | 274.4 | 334.2
Income (loss) from discontinued operations, net of tax | 0.1 |  | (0.3) |  | 0.0 | (0.1)
NET INCOME (LOSS) | 251.6 |  | 278.3 |  | 274.4 | 334.1
Other Comprehensive Income (Loss), Net of Tax | 6.6 |  | 6.0 |  | 13.3 | 11.9
TOTAL COMPREHENSIVE INCOME (LOSS) | 258.2 |  | 284.3 |  | 287.7 | 346.0
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member] |  |  |  |  |  |
Product Revenue | 0.0 |  | 0.0 |  | 0.0 | 0.0
Freight Revenue | 0.0 |  | 0.0 |  | 0.0 | 0.0
Revenues | 0.0 |  | 0.0 |  | 0.0 | 0.0
COST OF GOODS SOLD | 0.0 |  | 0.0 |  | 0.0 | 0.0
SALES MARGIN | 0.0 |  | 0.0 |  | 0.0 | 0.0
Selling, general and administrative expenses | (0.2) |  | (0.1) |  | (0.3) | (0.4)
Miscellaneous - net | (0.8) |  | (0.3) |  | (1.0) | (0.9)
Other operating expense | (1.0) |  | (0.4) |  | (1.3) | (1.3)
OPERATING INCOME (LOSS) | (1.0) |  | (0.4) |  | (1.3) | (1.3)
Interest expense, net | 0.1 |  | 0.2 |  | 0.2 | 0.5
Gain (loss) on extinguishment of debt | 0.0 |  | 0.0 |  | 0.0 | 0.0
Other non-operating income (expense) | 4.8 |  | 5.0 |  | 9.5 | 9.8
TOTAL OTHER INCOME (EXPENSE) | 4.9 |  | 5.2 |  | 9.7 | 10.3
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES | 3.9 |  | 4.8 |  | 8.4 | 9.0
Income tax benefit (expense) | 0.0 |  | 0.2 |  | 0.1 | 0.2
EQUITY IN INCOME OF SUBSIDIARIES | 0.0 |  | 0.0 |  | 0.0 | 0.0
INCOME FROM CONTINUING OPERATIONS | 3.9 |  | 4.6 |  | 8.3 | 8.8
Income (loss) from discontinued operations, net of tax | (0.8) |  | (67.9) |  | (0.7) | (139.1)
NET INCOME (LOSS) | 3.1 |  | (63.3) |  | 7.6 | (130.3)
Other Comprehensive Income (Loss), Net of Tax | 0.0 |  | 2.2 |  | 0.0 | 3.0
TOTAL COMPREHENSIVE INCOME (LOSS) | 3.1 |  | (61.1) |  | 7.6 | (127.3)
Consolidation, Eliminations [Member] |  |  |  |  |  |
Product Revenue | 0.0 |  | 0.0 |  | 0.0 | 0.0
Freight Revenue | 0.0 |  | 0.0 |  | 0.0 | 0.0
Revenues | 0.0 |  | 0.0 |  | 0.0 | 0.0
COST OF GOODS SOLD | 0.0 |  | 0.0 |  | 0.0 | 0.0
SALES MARGIN | 0.0 |  | 0.0 |  | 0.0 | 0.0
Selling, general and administrative expenses | 0.0 |  | 0.0 |  | 0.0 | 0.0
Miscellaneous - net | 0.0 |  | 0.0 |  | 0.0 | 0.0
Other operating expense | 0.0 |  | 0.0 |  | 0.0 | 0.0
OPERATING INCOME (LOSS) | 0.0 |  | 0.0 |  | 0.0 | 0.0
Interest expense, net | 0.0 |  | 0.0 |  | 0.0 | 0.0
Gain (loss) on extinguishment of debt | 0.0 |  | 0.0 |  | 0.0 | 0.0
Other non-operating income (expense) | 0.0 |  | 0.0 |  | 0.0 | 0.0
TOTAL OTHER INCOME (EXPENSE) | 0.0 |  | 0.0 |  | 0.0 | 0.0
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES | 0.0 |  | 0.0 |  | 0.0 | 0.0
Income tax benefit (expense) | 0.0 |  | 0.0 |  | 0.0 | 0.0
EQUITY IN INCOME OF SUBSIDIARIES | (254.7) |  | (215.0) |  | (282.0) | (203.8)
INCOME FROM CONTINUING OPERATIONS | (254.7) |  | (215.0) |  | (282.0) | (203.8)
Income (loss) from discontinued operations, net of tax | 0.0 |  | 0.0 |  | 0.0 | 0.0
NET INCOME (LOSS) | (254.7) |  | (215.0) |  | (282.0) | (203.8)
Other Comprehensive Income (Loss), Net of Tax | (6.6) |  | (8.2) |  | (13.3) | (14.9)
TOTAL COMPREHENSIVE INCOME (LOSS) | $ (261.3) |  | $ (223.2) |  | $ (295.3) | $ (218.7)

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