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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 | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Jan. 01, 2018 | Dec. 31, 2017 | Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | $ 684.7 |  |  | $ 530.7 |  |  | $ 1,525.9 | $ 1,195.0 |  |  |
Cash and cash equivalents | 897.1 |  |  | 227.1 |  |  | 897.1 | 227.1 | $ 978.3 | $ 978.3 |
Accounts receivable, net | 141.4 |  |  |  |  |  | 141.4 |  | 183.3 | 106.7 |
Inventories | (187.9) |  |  |  |  |  | (187.9) |  | (87.0) | (138.4) |
Supplies and other inventories | 88.2 |  |  |  |  |  | 88.2 |  | 88.8 | 88.8 |
Derivative assets | 190.8 |  |  |  |  |  | 190.8 |  | 49.5 | 37.9 |
Income tax receivable | 110.3 |  |  |  |  |  | 110.3 |  | 13.3 | 13.3 |
Current assets of discontinued operations | 16.1 |  |  |  |  |  | 16.1 |  | 118.5 | 118.5 |
Loans to and accounts receivable from the Canadian Entities | 0.0 |  |  |  |  |  | 0.0 |  | 51.6 | 51.6 |
Other current assets | 18.8 |  |  |  |  |  | 18.8 |  | 11.1 | 11.1 |
TOTAL CURRENT ASSETS | 1,650.6 |  |  |  |  |  | 1,650.6 |  | 1,581.4 | 1,544.6 |
PROPERTY, PLANT AND EQUIPMENT, NET | 1,144.8 |  |  |  |  |  | 1,144.8 |  | 1,033.8 | 1,033.8 |
Deposits for property, plant and equipment | 94.6 |  |  |  |  |  | 94.6 |  | 17.8 | 17.8 |
Income tax receivable | 113.6 |  |  |  |  |  | 113.6 |  | 235.3 | 235.3 |
Non-current assets of discontinued operations | 0.0 |  |  |  |  |  | 0.0 |  | 20.3 | 20.3 |
Other non-current assets | 121.4 |  |  |  |  |  | 121.4 |  | 101.6 | 101.6 |
TOTAL OTHER ASSETS | 329.6 |  |  |  |  |  | 329.6 |  | 375.0 | 375.0 |
Assets | 3,125.0 |  |  |  |  |  | 3,125.0 |  | 2,990.2 | 2,953.4 |
Accounts payable | 140.8 |  |  |  |  |  | 140.8 |  | 100.9 | 99.5 |
Accrued expenses | 95.1 |  |  |  |  |  | 95.1 |  | 79.1 | 79.1 |
Accrued interest | 26.2 |  |  |  |  |  | 26.2 |  | 31.4 | 31.4 |
Contingent claims | 0.0 |  |  |  |  |  | 0.0 |  | 55.6 | 55.6 |
Partnership distribution payable | 43.1 |  |  |  |  |  | 43.1 |  | 44.2 | 44.2 |
Current liabilities of discontinued operations | 14.2 |  |  |  |  |  | 14.2 |  | 75.0 | 75.0 |
Other current liabilities | (61.3) |  |  |  |  |  | (61.3) |  | (68.8) | (67.4) |
TOTAL CURRENT LIABILITIES | 380.7 |  |  |  |  |  | 380.7 |  | 455.0 | 452.2 |
PENSION AND POSTEMPLOYMENT BENEFIT LIABILITIES | 225.0 |  |  |  |  |  | 225.0 |  | 257.7 | 257.7 |
ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS | 174.4 |  |  |  |  |  | 174.4 |  | 167.7 | 167.7 |
LONG-TERM DEBT | 2,300.0 |  |  |  |  |  | 2,300.0 |  | 2,304.2 | 2,304.2 |
NON-CURRENT LIABILITIES OF DISCONTINUED OPERATIONS | 9.3 |  |  |  |  |  | 9.3 |  | 52.2 | 52.2 |
OTHER LIABILITIES | 121.8 |  |  |  |  |  | 121.8 |  | 163.5 | 163.5 |
Liabilities | 3,211.2 |  |  |  |  |  | 3,211.2 |  | 3,400.3 | 3,397.5 |
TOTAL CLIFFS SHAREHOLDERS' DEFICIT | (86.2) |  |  |  |  |  | (86.2) |  | (410.3) | (444.3) |
NONCONTROLLING INTEREST | 0.0 |  |  |  |  |  | 0.0 |  | 0.2 | 0.2 |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | (86.2) | $ (306.3) | $ (484.8) | (833.1) | $ (666.7) | $ (703.0) | (86.2) | (833.1) | (410.1) | (444.1) | $ (1,330.5)
TOTAL LIABILITIES AND DEFICIT | 3,125.0 |  |  |  |  |  | 3,125.0 |  | 2,990.2 | $ 2,953.4 |
Freight and venture partners' cost reimbursements | 57.1 |  |  | 66.0 |  |  | 110.2 | 159.2 |  |  |
Revenues | 741.8 |  |  | 596.7 |  |  | 1,636.1 | 1,354.2 |  |  |
COST OF GOODS SOLD AND OPERATING EXPENSES | (480.2) |  |  | (438.9) |  |  | (1,028.5) | (1,002.7) |  |  |
SALES MARGIN | 261.6 |  |  | 157.8 |  |  | 607.6 | 351.5 |  |  |
Selling, general and administrative expenses | (30.1) |  |  | (23.8) |  |  | (81.4) | (75.5) |  |  |
Miscellaneous - net | (6.0) |  |  | (5.3) |  |  | (16.2) | 1.3 |  |  |
Other operating expense | (36.1) |  |  | (29.1) |  |  | (97.6) | (74.2) |  |  |
OPERATING INCOME | 225.5 |  |  | 128.7 |  |  | 510.0 | 277.3 |  |  |
Interest expense, net | (29.5) |  |  | (27.6) |  |  | (93.1) | (99.1) |  |  |
Gain (loss) on extinguishment of debt | 0.0 |  |  | (88.6) |  |  | 0.2 | (165.4) |  |  |
Other non-operating income | 4.3 |  |  | 2.6 |  |  | 13.1 | 7.6 |  |  |
TOTAL OTHER INCOME (EXPENSE) | (25.2) |  |  | (113.6) |  |  | (79.8) | (256.9) |  |  |
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES | 200.3 |  |  | 15.1 |  |  | 430.2 | 20.4 |  |  |
INCOME TAX BENEFIT (EXPENSE) | (0.5) |  |  | 7.2 |  |  | (14.4) | 7.2 |  |  |
INCOME FROM CONTINUING OPERATIONS | 199.8 |  |  | 22.3 |  |  | 415.8 | 27.6 |  |  |
INCOME FROM DISCONTINUED OPERATIONS, NET OF TAX | 238.0 |  |  | 30.6 |  |  | 102.8 | 25.6 |  |  |
NET INCOME | 437.8 | $ 165.1 | $ (84.3) | 52.9 | $ 30.1 | $ (29.8) | 518.6 | 53.2 |  |  |
LOSS ATTRIBUTABLE TO NONCONTROLLING INTEREST | 0.0 |  |  | 0.5 |  |  | 0.0 | 3.9 |  |  |
NET INCOME ATTRIBUTABLE TO CLIFFS SHAREHOLDERS | $ 437.8 |  |  | $ 53.4 |  |  | $ 518.6 | $ 57.1 |  |  |
Continuing operations (in dollars per share) | $ 0.67 |  |  | $ 0.08 |  |  | $ 1.40 | $ 0.11 |  |  |
Discontinued operations (in dollars per share) | 0.80 |  |  | 0.10 |  |  | 0.35 | 0.09 |  |  |
Earnings (Loss) per Common Share Attributable to Cliffs Common Shareholders - Basic (in dollars per share) | 1.47 |  |  | 0.18 |  |  | 1.75 | 0.20 |  |  |
Continuing operations (in dollars per share) | 0.64 |  |  | 0.08 |  |  | 1.37 | 0.11 |  |  |
Discontinued operations (in dollars per share) | 0.77 |  |  | 0.10 |  |  | 0.34 | 0.08 |  |  |
Earnings (Loss) per Common Share Attributable to Cliffs Common Shareholders - Diluted (in dollars per share) | $ 1.41 |  |  | $ 0.18 |  |  | $ 1.71 | $ 0.19 |  |  |
Basic | 297,878 |  |  | 296,100 |  |  | 297,587 | 285,771 |  |  |
Diluted | 310,203 |  |  | 301,100 |  |  | 303,518 | 290,512 |  |  |
Accounting Standards Update 2017-07 [Member] |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
COST OF GOODS SOLD AND OPERATING EXPENSES |  |  |  | $ (0.6) |  |  |  | $ (1.7) |  |  |
Selling, general and administrative expenses |  |  |  | 2.0 |  |  |  | 5.9 |  |  |
Miscellaneous - net |  |  |  | (0.4) |  |  |  | (1.1) |  |  |
OPERATING INCOME |  |  |  | (1.8) |  |  |  | (5.3) |  |  |
Other non-operating income |  |  |  | 1.8 |  |  |  | 5.3 |  |  |
NET INCOME |  |  |  | 0.0 |  |  |  | 0.0 |  |  |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | $ 675.6 |  |  |  |  |  | $ 1,471.2 |  |  |  |
Cash and cash equivalents | 897.1 |  |  |  |  |  | 897.1 |  |  |  |
Accounts receivable, net | 34.8 |  |  |  |  |  | 34.8 |  |  |  |
Inventories | (257.5) |  |  |  |  |  | (257.5) |  |  |  |
Supplies and other inventories | 88.2 |  |  |  |  |  | 88.2 |  |  |  |
Derivative assets | 156.6 |  |  |  |  |  | 156.6 |  |  |  |
Income tax receivable | 110.3 |  |  |  |  |  | 110.3 |  |  |  |
Current assets of discontinued operations | 16.1 |  |  |  |  |  | 16.1 |  |  |  |
Other current assets | 18.8 |  |  |  |  |  | 18.8 |  |  |  |
TOTAL CURRENT ASSETS | 1,579.4 |  |  |  |  |  | 1,579.4 |  |  |  |
PROPERTY, PLANT AND EQUIPMENT, NET | 1,144.8 |  |  |  |  |  | 1,144.8 |  |  |  |
Deposits for property, plant and equipment | 94.6 |  |  |  |  |  | 94.6 |  |  |  |
Income tax receivable | 113.6 |  |  |  |  |  | 113.6 |  |  |  |
Other non-current assets | 121.4 |  |  |  |  |  | 121.4 |  |  |  |
TOTAL OTHER ASSETS | 329.6 |  |  |  |  |  | 329.6 |  |  |  |
Assets | 3,053.8 |  |  |  |  |  | 3,053.8 |  |  |  |
Accounts payable | 140.1 |  |  |  |  |  | 140.1 |  |  |  |
Accrued expenses | 95.1 |  |  |  |  |  | 95.1 |  |  |  |
Accrued interest | 26.2 |  |  |  |  |  | 26.2 |  |  |  |
Partnership distribution payable | 43.1 |  |  |  |  |  | 43.1 |  |  |  |
Current liabilities of discontinued operations | 14.2 |  |  |  |  |  | 14.2 |  |  |  |
Other current liabilities | (61.5) |  |  |  |  |  | (61.5) |  |  |  |
TOTAL CURRENT LIABILITIES | 380.2 |  |  |  |  |  | 380.2 |  |  |  |
PENSION AND POSTEMPLOYMENT BENEFIT LIABILITIES | 225.0 |  |  |  |  |  | 225.0 |  |  |  |
ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS | 174.4 |  |  |  |  |  | 174.4 |  |  |  |
LONG-TERM DEBT | 2,300.0 |  |  |  |  |  | 2,300.0 |  |  |  |
NON-CURRENT LIABILITIES OF DISCONTINUED OPERATIONS | 9.3 |  |  |  |  |  | 9.3 |  |  |  |
OTHER LIABILITIES | 121.8 |  |  |  |  |  | 121.8 |  |  |  |
Liabilities | 3,210.7 |  |  |  |  |  | 3,210.7 |  |  |  |
TOTAL CLIFFS SHAREHOLDERS' DEFICIT | (156.9) |  |  |  |  |  | (156.9) |  |  |  |
TOTAL LIABILITIES AND DEFICIT | 3,053.8 |  |  |  |  |  | 3,053.8 |  |  |  |
Freight and venture partners' cost reimbursements | 56.5 |  |  |  |  |  | 107.7 |  |  |  |
Revenues | 732.1 |  |  |  |  |  | 1,578.9 |  |  |  |
COST OF GOODS SOLD AND OPERATING EXPENSES | (475.9) |  |  |  |  |  | (1,006.6) |  |  |  |
SALES MARGIN | 256.2 |  |  |  |  |  | 572.3 |  |  |  |
Selling, general and administrative expenses | (30.1) |  |  |  |  |  | (81.4) |  |  |  |
Miscellaneous - net |  |  |  |  |  |  | (16.2) |  |  |  |
Other operating expense | (36.1) |  |  |  |  |  | (97.6) |  |  |  |
OPERATING INCOME | 220.1 |  |  |  |  |  | 474.7 |  |  |  |
Interest expense, net | (29.5) |  |  |  |  |  | (93.1) |  |  |  |
Gain (loss) on extinguishment of debt | 0.0 |  |  |  |  |  | 0.2 |  |  |  |
Other non-operating income | 4.3 |  |  |  |  |  | 13.1 |  |  |  |
TOTAL OTHER INCOME (EXPENSE) | (25.2) |  |  |  |  |  | (79.8) |  |  |  |
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES | 194.9 |  |  |  |  |  | 394.9 |  |  |  |
INCOME TAX BENEFIT (EXPENSE) | (0.5) |  |  |  |  |  | (14.4) |  |  |  |
INCOME FROM CONTINUING OPERATIONS | 194.4 |  |  |  |  |  | 380.5 |  |  |  |
INCOME FROM DISCONTINUED OPERATIONS, NET OF TAX | 238.0 |  |  |  |  |  | 102.8 |  |  |  |
NET INCOME ATTRIBUTABLE TO CLIFFS SHAREHOLDERS | $ 432.4 |  |  |  |  |  | $ 483.3 |  |  |  |
Continuing operations (in dollars per share) | $ 0.65 |  |  |  |  |  | $ 1.28 |  |  |  |
Discontinued operations (in dollars per share) | 0.80 |  |  |  |  |  | 0.35 |  |  |  |
Earnings (Loss) per Common Share Attributable to Cliffs Common Shareholders - Basic (in dollars per share) | 1.45 |  |  |  |  |  | 1.63 |  |  |  |
Continuing operations (in dollars per share) | 0.62 |  |  |  |  |  | 1.25 |  |  |  |
Discontinued operations (in dollars per share) | 0.77 |  |  |  |  |  | 0.34 |  |  |  |
Earnings (Loss) per Common Share Attributable to Cliffs Common Shareholders - Diluted (in dollars per share) | $ 1.39 |  |  |  |  |  | $ 1.59 |  |  |  |
Basic | 297,878 |  |  |  |  |  | 297,587 |  |  |  |
Diluted | 310,203 |  |  |  |  |  | 303,518 |  |  |  |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | $ 9.1 |  |  |  |  |  | $ 54.7 |  |  |  |
Cash and cash equivalents | 0.0 |  |  |  |  |  | 0.0 |  | 0.0 |  |
Accounts receivable, net | 106.6 |  |  |  |  |  | 106.6 |  | 76.6 |  |
Inventories | (69.6) |  |  |  |  |  | (69.6) |  | (51.4) |  |
Supplies and other inventories | 0.0 |  |  |  |  |  | 0.0 |  | 0.0 |  |
Derivative assets | 34.2 |  |  |  |  |  | 34.2 |  | 11.6 |  |
Income tax receivable | 0.0 |  |  |  |  |  | 0.0 |  | 0.0 |  |
Current assets of discontinued operations | 0.0 |  |  |  |  |  | 0.0 |  | 0.0 |  |
Loans to and accounts receivable from the Canadian Entities |  |  |  |  |  |  |  |  | 0.0 |  |
Other current assets | 0.0 |  |  |  |  |  | 0.0 |  | 0.0 |  |
TOTAL CURRENT ASSETS | 71.2 |  |  |  |  |  | 71.2 |  | 36.8 |  |
PROPERTY, PLANT AND EQUIPMENT, NET | 0.0 |  |  |  |  |  | 0.0 |  | 0.0 |  |
Deposits for property, plant and equipment | 0.0 |  |  |  |  |  | 0.0 |  | 0.0 |  |
Income tax receivable | 0.0 |  |  |  |  |  | 0.0 |  | 0.0 |  |
Non-current assets of discontinued operations |  |  |  |  |  |  |  |  | 0.0 |  |
Other non-current assets | 0.0 |  |  |  |  |  | 0.0 |  | 0.0 |  |
TOTAL OTHER ASSETS | 0.0 |  |  |  |  |  | 0.0 |  | 0.0 |  |
Assets | 71.2 |  |  |  |  |  | 71.2 |  | 36.8 |  |
Accounts payable | 0.7 |  |  |  |  |  | 0.7 |  | 1.4 |  |
Accrued expenses | 0.0 |  |  |  |  |  | 0.0 |  | 0.0 |  |
Accrued interest | 0.0 |  |  |  |  |  | 0.0 |  | 0.0 |  |
Contingent claims |  |  |  |  |  |  |  |  | 0.0 |  |
Partnership distribution payable | 0.0 |  |  |  |  |  | 0.0 |  | 0.0 |  |
Current liabilities of discontinued operations | 0.0 |  |  |  |  |  | 0.0 |  | 0.0 |  |
Other current liabilities | (0.2) |  |  |  |  |  | (0.2) |  | (1.4) |  |
TOTAL CURRENT LIABILITIES | 0.5 |  |  |  |  |  | 0.5 |  | 2.8 |  |
PENSION AND POSTEMPLOYMENT BENEFIT LIABILITIES | 0.0 |  |  |  |  |  | 0.0 |  | 0.0 |  |
ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS | 0.0 |  |  |  |  |  | 0.0 |  | 0.0 |  |
LONG-TERM DEBT | 0.0 |  |  |  |  |  | 0.0 |  | 0.0 |  |
NON-CURRENT LIABILITIES OF DISCONTINUED OPERATIONS | 0.0 |  |  |  |  |  | 0.0 |  | 0.0 |  |
OTHER LIABILITIES | 0.0 |  |  |  |  |  | 0.0 |  | 0.0 |  |
Liabilities | 0.5 |  |  |  |  |  | 0.5 |  | 2.8 |  |
TOTAL CLIFFS SHAREHOLDERS' DEFICIT | 70.7 |  |  |  |  |  | 70.7 |  | 34.0 |  |
NONCONTROLLING INTEREST |  |  |  |  |  |  |  |  | 0.0 |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  | 34.0 |  |
TOTAL LIABILITIES AND DEFICIT | 71.2 |  |  |  |  |  | 71.2 |  | $ 36.8 |  |
Freight and venture partners' cost reimbursements | 0.6 |  |  |  |  |  | 2.5 |  |  |  |
Revenues | 9.7 |  |  |  |  |  | 57.2 |  |  |  |
COST OF GOODS SOLD AND OPERATING EXPENSES | (4.3) |  |  |  |  |  | (21.9) |  |  |  |
SALES MARGIN | 5.4 |  |  |  |  |  | 35.3 |  |  |  |
Selling, general and administrative expenses | 0.0 |  |  |  |  |  | 0.0 |  |  |  |
Miscellaneous - net | 0.0 |  |  |  |  |  | 0.0 |  |  |  |
Other operating expense | 0.0 |  |  |  |  |  | 0.0 |  |  |  |
OPERATING INCOME | 5.4 |  |  |  |  |  | 35.3 |  |  |  |
Interest expense, net | 0.0 |  |  |  |  |  | 0.0 |  |  |  |
Gain (loss) on extinguishment of debt | 0.0 |  |  |  |  |  | 0.0 |  |  |  |
Other non-operating income | 0.0 |  |  |  |  |  | 0.0 |  |  |  |
TOTAL OTHER INCOME (EXPENSE) | 0.0 |  |  |  |  |  | 0.0 |  |  |  |
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES | 5.4 |  |  |  |  |  | 35.3 |  |  |  |
INCOME TAX BENEFIT (EXPENSE) | 0.0 |  |  |  |  |  | 0.0 |  |  |  |
INCOME FROM CONTINUING OPERATIONS | 5.4 |  |  |  |  |  | 35.3 |  |  |  |
INCOME FROM DISCONTINUED OPERATIONS, NET OF TAX | 0.0 |  |  |  |  |  | 0.0 |  |  |  |
NET INCOME ATTRIBUTABLE TO CLIFFS SHAREHOLDERS | $ 5.4 |  |  |  |  |  | $ 35.3 |  |  |  |
Continuing operations (in dollars per share) | $ 0.02 |  |  |  |  |  | $ 0.12 |  |  |  |
Discontinued operations (in dollars per share) | 0.00 |  |  |  |  |  | 0.00 |  |  |  |
Earnings (Loss) per Common Share Attributable to Cliffs Common Shareholders - Basic (in dollars per share) | 0.02 |  |  |  |  |  | 0.12 |  |  |  |
Continuing operations (in dollars per share) | 0.02 |  |  |  |  |  | 0.12 |  |  |  |
Discontinued operations (in dollars per share) | 0.00 |  |  |  |  |  | 0.00 |  |  |  |
Earnings (Loss) per Common Share Attributable to Cliffs Common Shareholders - Diluted (in dollars per share) | $ 0.02 |  |  |  |  |  | $ 0.12 |  |  |  |
Previously Reported [Member] |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
COST OF GOODS SOLD AND OPERATING EXPENSES |  |  |  | (439.5) |  |  |  | (1,004.4) |  |  |
Selling, general and administrative expenses |  |  |  | (21.8) |  |  |  | (69.6) |  |  |
Miscellaneous - net |  |  |  | (4.9) |  |  |  | 2.4 |  |  |
OPERATING INCOME |  |  |  | 130.5 |  |  |  | 282.6 |  |  |
Other non-operating income |  |  |  | 0.8 |  |  |  | 2.3 |  |  |
NET INCOME |  |  |  | $ 52.9 |  |  |  | $ 53.2 |  |  |

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