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NEW ACCOUNTING STANDARDS (Schedule of New Accounting Pronouncements and Changes in Accounting Principles) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Jan. 01, 2018 | Dec. 31, 2017 | Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cash and cash equivalents | $ 786.6 | $ 295.3 | $ 1,007.7 | $ 1,007.7 |
Accounts receivable, net | 47.2 |  | 217.2 | 140.6 |
Inventories | (324.4) |  | (132.0) | (183.4) |
Supplies and other inventories | 81.7 |  | 93.9 | 93.9 |
Derivative assets | 93.6 |  | 51.0 | 39.4 |
Loans to and accounts receivable from the Canadian Entities | 50.4 |  | 51.6 | 51.6 |
Other current assets | 28.5 |  | 28.0 | 28.0 |
Assets, Current | 1,412.4 |  | 1,581.4 | 1,544.6 |
PROPERTY, PLANT AND EQUIPMENT, NET | 1,047.3 |  | 1,051.0 | 1,051.0 |
Deposits for property, plant and equipment | 74.1 |  | 17.8 | 17.8 |
Income tax receivable | 219.9 |  | 235.3 | 235.3 |
Other non-current assets | 109.2 |  | 104.7 | 104.7 |
Total Other Assets | 403.2 |  | 357.8 | 357.8 |
Assets | 2,862.9 |  | 2,990.2 | 2,953.4 |
Accounts payable | 99.5 |  | 129.1 | 127.7 |
Accrued expenses | 94.4 |  | 107.1 | 107.1 |
Accrued interest | 28.2 |  | 31.4 | 31.4 |
Contingent claims | 54.3 |  | 55.6 | 55.6 |
Partnership distribution payable | 44.2 |  | 44.2 | 44.2 |
Other current liabilities | 104.3 |  | 87.6 | 86.2 |
Liabilities, Current | 424.9 |  | 455.0 | 452.2 |
PENSION AND POSTEMPLOYMENT BENEFIT LIABILITIES | 251.4 |  | 257.7 | 257.7 |
ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS | 181.2 |  | 196.5 | 196.5 |
LONG-TERM DEBT | 2,308.2 |  | 2,304.2 | 2,304.2 |
OTHER LIABILITIES | 182.0 |  | 186.9 | 186.9 |
Liabilities | 3,347.7 |  | 3,400.3 | 3,397.5 |
Stockholders' Equity Attributable to Parent | (485.0) |  | (410.3) | (444.3) |
Stockholders' Equity Attributable to Noncontrolling Interest | 0.2 |  | 0.2 | 0.2 |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | (484.8) | (703.0) | (410.1) | (444.1) | $ (1,330.5)
Liabilities and Equity | 2,862.9 |  | 2,990.2 | $ 2,953.4 |
Product | (220.7) | (412.8) |  |  |
Freight and venture partners' cost reimbursements | (18.3) | (48.8) |  |  |
Revenues | 239.0 | 461.6 |  |  |
Cost of Goods and Services Sold | (242.6) | (365.3) |  |  |
Sales margin | (3.6) | 96.3 |  |  |
Selling, General and Administrative Expense | (27.7) | (27.7) |  |  |
Miscellaneous - net | (8.7) | 11.5 |  |  |
Other operating expense | (36.4) | (16.2) |  |  |
Operating Income (Loss) | (40.0) | 80.1 |  |  |
Interest expense, net | (33.5) | (42.8) |  |  |
Other non-operating income | 4.4 | 2.5 |  |  |
Other expense | (29.1) | (112.2) |  |  |
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest | (69.1) | (32.1) |  |  |
Income Tax Expense (Benefit) | (15.7) | 1.8 |  |  |
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest | (84.8) | (30.3) |  |  |
INCOME FROM DISCONTINUED OPERATIONS, NET OF TAX | 0.5 | 0.5 |  |  |
Net Loss | (84.3) | (29.8) |  |  |
LOSS ATTRIBUTABLE TO NONCONTROLLING INTEREST | 0.0 | 1.7 |  |  |
NET LOSS ATTRIBUTABLE TO CLIFFS SHAREHOLDERS | $ (84.3) | $ (28.1) |  |  |
Income (Loss) from Continuing Operations, Per Basic Share | $ (0.29) | $ (0.11) |  |  |
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share | 0.00 | 0.00 |  |  |
Earnings Per Share, Basic | (0.29) | (0.11) |  |  |
Income (Loss) from Continuing Operations, Per Diluted Share | (0.29) | (0.11) |  |  |
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share | 0.00 | 0.00 |  |  |
Earnings Per Share, Diluted | $ (0.29) | $ (0.11) |  |  |
Basic | 297,266 | 265,164 |  |  |
Diluted | 297,266 | 265,164 |  |  |
Scenario, Previously Reported [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cost of Goods and Services Sold |  | $ (365.9) |  |  |
Selling, General and Administrative Expense |  | (25.7) |  |  |
Miscellaneous - net |  | 11.9 |  |  |
Operating Income (Loss) |  | 81.9 |  |  |
Other non-operating income |  | 0.7 |  |  |
Net Loss |  | (29.8) |  |  |
Accounting Standards Update 2017-07 [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cost of Goods and Services Sold |  | 0.6 |  |  |
Selling, General and Administrative Expense |  | (2.0) |  |  |
Miscellaneous - net |  | (0.4) |  |  |
Operating Income (Loss) |  | (1.8) |  |  |
Other non-operating income |  | 1.8 |  |  |
Net Loss |  | $ 0.0 |  |  |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cash and cash equivalents | $ 786.6 |  |  |  |
Accounts receivable, net | 24.9 |  |  |  |
Inventories | (332.0) |  |  |  |
Supplies and other inventories | 81.7 |  |  |  |
Derivative assets | 91.3 |  |  |  |
Loans to and accounts receivable from the Canadian Entities | 50.4 |  |  |  |
Other current assets | 28.5 |  |  |  |
Assets, Current | 1,395.4 |  |  |  |
PROPERTY, PLANT AND EQUIPMENT, NET | 1,047.3 |  |  |  |
Deposits for property, plant and equipment | 74.1 |  |  |  |
Income tax receivable | 219.9 |  |  |  |
Other non-current assets | 109.2 |  |  |  |
Total Other Assets | 403.2 |  |  |  |
Assets | 2,845.9 |  |  |  |
Accounts payable | 99.2 |  |  |  |
Accrued expenses | 94.4 |  |  |  |
Accrued interest | 28.2 |  |  |  |
Contingent claims | 54.3 |  |  |  |
Partnership distribution payable | 44.2 |  |  |  |
Other current liabilities | 104.0 |  |  |  |
Liabilities, Current | 424.3 |  |  |  |
PENSION AND POSTEMPLOYMENT BENEFIT LIABILITIES | 251.4 |  |  |  |
ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS | 181.2 |  |  |  |
LONG-TERM DEBT | 2,308.2 |  |  |  |
OTHER LIABILITIES | 182.0 |  |  |  |
Liabilities | 3,347.1 |  |  |  |
Stockholders' Equity Attributable to Parent | (501.4) |  |  |  |
Stockholders' Equity Attributable to Noncontrolling Interest | 0.2 |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | (501.2) |  |  |  |
Liabilities and Equity | 2,845.9 |  |  |  |
Product | (279.1) |  |  |  |
Freight and venture partners' cost reimbursements | (22.4) |  |  |  |
Revenues | 301.5 |  |  |  |
Cost of Goods and Services Sold | (286.2) |  |  |  |
Sales margin | 15.3 |  |  |  |
Selling, General and Administrative Expense | (27.7) |  |  |  |
Miscellaneous - net | (8.7) |  |  |  |
Other operating expense | (36.4) |  |  |  |
Operating Income (Loss) | (21.1) |  |  |  |
Interest expense, net | (33.5) |  |  |  |
Other non-operating income | 4.4 |  |  |  |
Other expense | (29.1) |  |  |  |
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest | (50.2) |  |  |  |
Income Tax Expense (Benefit) | (15.7) |  |  |  |
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest | (65.9) |  |  |  |
INCOME FROM DISCONTINUED OPERATIONS, NET OF TAX | 0.5 |  |  |  |
Net Loss | (65.4) |  |  |  |
LOSS ATTRIBUTABLE TO NONCONTROLLING INTEREST | 0.0 |  |  |  |
NET LOSS ATTRIBUTABLE TO CLIFFS SHAREHOLDERS | $ (65.4) |  |  |  |
Income (Loss) from Continuing Operations, Per Basic Share | $ (0.23) |  |  |  |
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share | 0.00 |  |  |  |
Earnings Per Share, Basic | (0.23) |  |  |  |
Income (Loss) from Continuing Operations, Per Diluted Share | (0.23) |  |  |  |
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share | 0.00 |  |  |  |
Earnings Per Share, Diluted | $ (0.23) |  |  |  |
Basic | 297,266 |  |  |  |
Diluted | 297,266 |  |  |  |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cash and cash equivalents | $ 0.0 |  | 0.0 |  |
Accounts receivable, net | 22.3 |  | 76.6 |  |
Inventories | (7.6) |  | (51.4) |  |
Supplies and other inventories | 0.0 |  | 0.0 |  |
Derivative assets | 2.3 |  | 11.6 |  |
Loans to and accounts receivable from the Canadian Entities | 0.0 |  | 0.0 |  |
Other current assets | 0.0 |  | 0.0 |  |
Assets, Current | 17.0 |  | 36.8 |  |
PROPERTY, PLANT AND EQUIPMENT, NET | 0.0 |  | 0.0 |  |
Deposits for property, plant and equipment | 0.0 |  | 0.0 |  |
Income tax receivable | 0.0 |  | 0.0 |  |
Other non-current assets | 0.0 |  | 0.0 |  |
Total Other Assets | 0.0 |  | 0.0 |  |
Assets | 17.0 |  | 36.8 |  |
Accounts payable | 0.3 |  | 1.4 |  |
Accrued expenses | 0.0 |  | 0.0 |  |
Accrued interest | 0.0 |  | 0.0 |  |
Contingent claims | 0.0 |  | 0.0 |  |
Partnership distribution payable | 0.0 |  | 0.0 |  |
Other current liabilities | 0.3 |  | 1.4 |  |
Liabilities, Current | 0.6 |  | 2.8 |  |
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 |  |
OTHER LIABILITIES | 0.0 |  | 0.0 |  |
Liabilities | 0.6 |  | 2.8 |  |
Stockholders' Equity Attributable to Parent | 16.4 |  | 34.0 |  |
Stockholders' Equity Attributable to Noncontrolling Interest | 0.0 |  | 0.0 |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 16.4 |  |  |  |
Liabilities and Equity | 17.0 |  | $ 36.8 |  |
Product | (58.4) |  |  |  |
Freight and venture partners' cost reimbursements | (4.1) |  |  |  |
Revenues | 62.5 |  |  |  |
Cost of Goods and Services Sold | (43.6) |  |  |  |
Sales margin | (18.9) |  |  |  |
Selling, General and Administrative Expense | 0.0 |  |  |  |
Miscellaneous - net | 0.0 |  |  |  |
Other operating expense | 0.0 |  |  |  |
Operating Income (Loss) | (18.9) |  |  |  |
Interest expense, net | 0.0 |  |  |  |
Other non-operating income | 0.0 |  |  |  |
Other expense | 0.0 |  |  |  |
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest | (18.9) |  |  |  |
Income Tax Expense (Benefit) | 0.0 |  |  |  |
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest | (18.9) |  |  |  |
INCOME FROM DISCONTINUED OPERATIONS, NET OF TAX | 0.0 |  |  |  |
Net Loss | (18.9) |  |  |  |
LOSS ATTRIBUTABLE TO NONCONTROLLING INTEREST | 0.0 |  |  |  |
NET LOSS ATTRIBUTABLE TO CLIFFS SHAREHOLDERS | $ (18.9) |  |  |  |
Income (Loss) from Continuing Operations, Per Basic Share | $ (0.06) |  |  |  |
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share | 0.00 |  |  |  |
Earnings Per Share, Basic | (0.06) |  |  |  |
Income (Loss) from Continuing Operations, Per Diluted Share | (0.06) |  |  |  |
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share | 0.00 |  |  |  |
Earnings Per Share, Diluted | $ (0.06) |  |  |  |

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