DEBT AND CREDIT FACILITIES (ABL Facility) (Details) - USD ($) $ in Millions |
Mar. 31, 2020 |
Dec. 31, 2019 |
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| Line of Credit Facility [Line Items] | ||||||
| Line of Credit Facility, Maximum Borrowing Capacity | $ 2,000.0 | $ 450.0 | ||||
| Credit Facility | ||||||
| Line of Credit Facility [Line Items] | ||||||
| Line of Credit Facility, Current Borrowing Capacity | [1] | 1,789.3 | ||||
| Long-term Line of Credit | (800.0) | |||||
| Line of Credit Facility, Remaining Borrowing Capacity | 790.0 | |||||
| Letter of Credit [Member] | ||||||
| Line of Credit Facility [Line Items] | ||||||
| Long-term Line of Credit | [2] | (199.3) | ||||
| Cleveland-Cliffs Inc. [Member] | Credit Facility | ||||||
| Line of Credit Facility [Line Items] | ||||||
| Long-term Line of Credit | $ (800.0) | $ 0.0 | ||||
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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