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SUPPLEMENTARY GUARANTOR INFORMATION (Supplementary Statements of Condensed Consolidating Financial Position) (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | --- | ---
Cash and cash equivalents | $ 399.3 |  |  | $ 823.2 | $ 897.1 | $ 978.3
Accounts receivable, net | 164.9 |  |  | 226.7 |  |
Finished goods inventories | 162.2 |  |  | 77.8 |  |
Work-in-process inventories | 55.2 |  |  | 10.1 |  |
Supplies and other inventories | 110.8 |  |  | 93.2 |  |
Derivative assets | 72.8 |  |  | 91.5 |  |
Income tax receivable, current | 58.7 |  |  | 117.3 |  |
Other current assets | 40.7 |  |  | 39.8 |  |
TOTAL CURRENT ASSETS | 1,064.6 |  |  | 1,479.6 |  |
PROPERTY, PLANT AND EQUIPMENT, NET | 1,769.9 |  |  | 1,286.0 |  |
Deposits for property, plant and equipment | 41.6 |  |  | 83.0 |  |
Income tax receivable, non-current | 62.7 |  |  | 121.3 |  |
Deferred income taxes | 437.5 |  |  | 464.8 |  |
Investment in subsidiaries | 0.0 |  |  | 0.0 |  |
Long-term intercompany notes | 0.0 |  |  | 0.0 |  |
Other non-current assets | 114.9 |  |  | 94.9 |  |
TOTAL OTHER ASSETS | 656.7 |  |  | 764.0 |  |
TOTAL ASSETS | 3,491.2 |  |  | 3,529.6 |  |
Accounts payable | 212.8 |  |  | 186.8 |  |
Accrued employment costs | 57.3 |  |  | 74.0 |  |
Accrued interest | 34.1 |  |  | 38.4 |  |
Derivative liabilities | 32.6 |  |  | 3.7 |  |
Partnership distribution payable | 0.0 |  |  | 43.5 |  |
Other current liabilities | 121.7 |  |  | 121.8 |  |
TOTAL CURRENT LIABILITIES | 458.5 |  |  | 468.2 |  |
PENSION AND POSTEMPLOYMENT BENEFIT LIABILITIES | 233.2 |  |  | 248.7 |  |
ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS | 179.1 |  |  | 172.0 |  |
LONG-TERM DEBT | 2,109.1 |  |  | 2,092.9 |  |
LONG-TERM INTERCOMPANY NOTES | 0.0 |  |  | 0.0 |  |
OTHER LIABILITIES | 151.4 |  |  | 123.6 |  |
TOTAL LIABILITIES | 3,131.3 |  |  | 3,105.4 |  |
TOTAL EQUITY | 359.9 | $ 285.6 | $ 261.7 | 424.2 |  |
TOTAL LIABILITIES AND EQUITY | 3,491.2 |  |  | 3,529.6 |  |
Consolidation, Eliminations [Member] |  |  |  |  |  |
Cash and cash equivalents | 0.0 |  |  | 0.0 | 0.0 | 0.0
Accounts receivable, net | (4.1) |  |  | (4.1) |  |
Finished goods inventories | 0.0 |  |  | 0.0 |  |
Work-in-process inventories | 0.0 |  |  | 0.0 |  |
Supplies and other inventories | 0.0 |  |  | 0.0 |  |
Derivative assets | 0.0 |  |  | 0.0 |  |
Income tax receivable, current | 0.0 |  |  | 0.0 |  |
Other current assets | 0.0 |  |  | 0.0 |  |
TOTAL CURRENT ASSETS | (4.1) |  |  | (4.1) |  |
PROPERTY, PLANT AND EQUIPMENT, NET | 0.0 |  |  | 0.0 |  |
Deposits for property, plant and equipment | 0.0 |  |  | 0.0 |  |
Income tax receivable, non-current | 0.0 |  |  | 0.0 |  |
Deferred income taxes | 0.0 |  |  | 0.0 |  |
Investment in subsidiaries | (1,820.2) |  |  | (1,313.1) |  |
Long-term intercompany notes | (121.3) |  |  | (121.3) |  |
Other non-current assets | 0.0 |  |  | 0.0 |  |
TOTAL OTHER ASSETS | (1,941.5) |  |  | (1,434.4) |  |
TOTAL ASSETS | (1,945.6) |  |  | (1,438.5) |  |
Accounts payable | (4.1) |  |  | (4.1) |  |
Accrued employment costs | 0.0 |  |  | 0.0 |  |
Accrued interest | 0.0 |  |  | 0.0 |  |
Derivative liabilities | 0.0 |  |  | 0.0 |  |
Partnership distribution payable | 0.0 |  |  | 0.0 |  |
Other current liabilities | 0.0 |  |  | 0.0 |  |
TOTAL CURRENT LIABILITIES | (4.1) |  |  | (4.1) |  |
PENSION AND POSTEMPLOYMENT BENEFIT LIABILITIES | 0.0 |  |  | 0.0 |  |
ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS | 0.0 |  |  | 0.0 |  |
LONG-TERM DEBT | 0.0 |  |  | 0.0 |  |
LONG-TERM INTERCOMPANY NOTES | (121.3) |  |  | (121.3) |  |
OTHER LIABILITIES | 0.0 |  |  | 0.0 |  |
TOTAL LIABILITIES | (125.4) |  |  | (125.4) |  |
TOTAL EQUITY | (1,820.2) |  |  | (1,313.1) |  |
TOTAL LIABILITIES AND EQUITY | (1,945.6) |  |  | (1,438.5) |  |
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member] |  |  |  |  |  |
Cash and cash equivalents | 2.7 |  |  | 2.7 | 2.7 | 27.3
Accounts receivable, net | 0.2 |  |  | 0.3 |  |
Finished goods inventories | 0.0 |  |  | 0.0 |  |
Work-in-process inventories | 0.0 |  |  | 0.0 |  |
Supplies and other inventories | 0.0 |  |  | 0.0 |  |
Derivative assets | 0.0 |  |  | 0.0 |  |
Income tax receivable, current | 0.0 |  |  | 0.0 |  |
Other current assets | 8.5 |  |  | 12.9 |  |
TOTAL CURRENT ASSETS | 11.4 |  |  | 15.9 |  |
PROPERTY, PLANT AND EQUIPMENT, NET | 50.8 |  |  | 50.8 |  |
Deposits for property, plant and equipment | 14.5 |  |  | 14.6 |  |
Income tax receivable, non-current | 0.0 |  |  | 0.0 |  |
Deferred income taxes | 1.2 |  |  | 1.2 |  |
Investment in subsidiaries | 0.0 |  |  | 0.0 |  |
Long-term intercompany notes | 121.3 |  |  | 121.3 |  |
Other non-current assets | 1.3 |  |  | 1.5 |  |
TOTAL OTHER ASSETS | 138.3 |  |  | 138.6 |  |
TOTAL ASSETS | 200.5 |  |  | 205.3 |  |
Accounts payable | 4.4 |  |  | 4.2 |  |
Accrued employment costs | 0.1 |  |  | 0.1 |  |
Accrued interest | 0.0 |  |  | 0.0 |  |
Derivative liabilities | 0.0 |  |  | 0.0 |  |
Partnership distribution payable | 0.0 |  |  | 0.0 |  |
Other current liabilities | 7.3 |  |  | 8.2 |  |
TOTAL CURRENT LIABILITIES | 11.8 |  |  | 12.5 |  |
PENSION AND POSTEMPLOYMENT BENEFIT LIABILITIES | (244.3) |  |  | (230.0) |  |
ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS | 19.4 |  |  | 19.9 |  |
LONG-TERM DEBT | 0.0 |  |  | 0.0 |  |
LONG-TERM INTERCOMPANY NOTES | 0.0 |  |  | 0.0 |  |
OTHER LIABILITIES | 6.1 |  |  | 8.8 |  |
TOTAL LIABILITIES | (207.0) |  |  | (188.8) |  |
TOTAL EQUITY | 407.5 |  |  | 394.1 |  |
TOTAL LIABILITIES AND EQUITY | 200.5 |  |  | 205.3 |  |
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member] |  |  |  |  |  |
Cash and cash equivalents | 0.4 |  |  | 0.7 | 1.9 | 2.1
Accounts receivable, net | 161.4 |  |  | 221.3 |  |
Finished goods inventories | 162.2 |  |  | 77.8 |  |
Work-in-process inventories | 55.2 |  |  | 10.1 |  |
Supplies and other inventories | 110.8 |  |  | 93.2 |  |
Derivative assets | 72.8 |  |  | 91.4 |  |
Income tax receivable, current | 0.0 |  |  | 0.0 |  |
Other current assets | 22.9 |  |  | 16.9 |  |
TOTAL CURRENT ASSETS | 585.7 |  |  | 511.4 |  |
PROPERTY, PLANT AND EQUIPMENT, NET | 1,706.8 |  |  | 1,221.9 |  |
Deposits for property, plant and equipment | 27.1 |  |  | 68.4 |  |
Income tax receivable, non-current | 4.1 |  |  | 4.1 |  |
Deferred income taxes | 0.0 |  |  | 0.0 |  |
Investment in subsidiaries | 39.7 |  |  | 50.8 |  |
Long-term intercompany notes | 0.0 |  |  | 0.0 |  |
Other non-current assets | 98.0 |  |  | 85.4 |  |
TOTAL OTHER ASSETS | 168.9 |  |  | 208.7 |  |
TOTAL ASSETS | 2,461.4 |  |  | 1,942.0 |  |
Accounts payable | 207.8 |  |  | 181.4 |  |
Accrued employment costs | 40.1 |  |  | 45.4 |  |
Accrued interest | 0.0 |  |  | 0.0 |  |
Derivative liabilities | 30.2 |  |  | 0.0 |  |
Partnership distribution payable | 0.0 |  |  | 43.5 |  |
Other current liabilities | 75.9 |  |  | 86.7 |  |
TOTAL CURRENT LIABILITIES | 354.0 |  |  | 357.0 |  |
PENSION AND POSTEMPLOYMENT BENEFIT LIABILITIES | 414.2 |  |  | 414.4 |  |
ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS | 159.7 |  |  | 152.1 |  |
LONG-TERM DEBT | 0.0 |  |  | 0.0 |  |
LONG-TERM INTERCOMPANY NOTES | 0.0 |  |  | 0.0 |  |
OTHER LIABILITIES | 120.8 |  |  | 99.5 |  |
TOTAL LIABILITIES | 1,048.7 |  |  | 1,023.0 |  |
TOTAL EQUITY | 1,412.7 |  |  | 919.0 |  |
TOTAL LIABILITIES AND EQUITY | 2,461.4 |  |  | 1,942.0 |  |
Reportable Legal Entities [Member] | Cliffs Shareholders Equity [Member] |  |  |  |  |  |
Cash and cash equivalents | 396.2 |  |  | 819.8 | $ 892.5 | $ 948.9
Accounts receivable, net | 7.4 |  |  | 9.2 |  |
Finished goods inventories | 0.0 |  |  | 0.0 |  |
Work-in-process inventories | 0.0 |  |  | 0.0 |  |
Supplies and other inventories | 0.0 |  |  | 0.0 |  |
Derivative assets | 0.0 |  |  | 0.1 |  |
Income tax receivable, current | 58.7 |  |  | 117.3 |  |
Other current assets | 9.3 |  |  | 10.0 |  |
TOTAL CURRENT ASSETS | 471.6 |  |  | 956.4 |  |
PROPERTY, PLANT AND EQUIPMENT, NET | 12.3 |  |  | 13.3 |  |
Deposits for property, plant and equipment | 0.0 |  |  | 0.0 |  |
Income tax receivable, non-current | 58.6 |  |  | 117.2 |  |
Deferred income taxes | 436.3 |  |  | 463.6 |  |
Investment in subsidiaries | 1,780.5 |  |  | 1,262.3 |  |
Long-term intercompany notes | 0.0 |  |  | 0.0 |  |
Other non-current assets | 15.6 |  |  | 8.0 |  |
TOTAL OTHER ASSETS | 2,291.0 |  |  | 1,851.1 |  |
TOTAL ASSETS | 2,774.9 |  |  | 2,820.8 |  |
Accounts payable | 4.7 |  |  | 5.3 |  |
Accrued employment costs | 17.1 |  |  | 28.5 |  |
Accrued interest | 34.1 |  |  | 38.4 |  |
Derivative liabilities | 2.4 |  |  | 3.7 |  |
Partnership distribution payable | 0.0 |  |  | 0.0 |  |
Other current liabilities | 38.5 |  |  | 26.9 |  |
TOTAL CURRENT LIABILITIES | 96.8 |  |  | 102.8 |  |
PENSION AND POSTEMPLOYMENT BENEFIT LIABILITIES | 63.3 |  |  | 64.3 |  |
ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS | 0.0 |  |  | 0.0 |  |
LONG-TERM DEBT | 2,109.1 |  |  | 2,092.9 |  |
LONG-TERM INTERCOMPANY NOTES | 121.3 |  |  | 121.3 |  |
OTHER LIABILITIES | 24.5 |  |  | 15.3 |  |
TOTAL LIABILITIES | 2,415.0 |  |  | 2,396.6 |  |
TOTAL EQUITY | 359.9 |  |  | 424.2 |  |
TOTAL LIABILITIES AND EQUITY | $ 2,774.9 |  |  | $ 2,820.8 |  |

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