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