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DEBT AND CREDIT FACILITIES - Narrative (Details) - USD ($) $ in Millions | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2020 | Jun. 19, 2020 | Apr. 24, 2020 | Apr. 17, 2020 | Mar. 16, 2020 | Mar. 13, 2020
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt, Gross | $ 4,640.7 |  |  |  |  |
6.375% 2025 Senior Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  | $ 231.8 |
Debt Instrument, Interest Rate, Stated Percentage | 6.375% |  |  |  |  |
Repurchase price if triggering event occurs | 101.00% |  |  |  |  |
Debt Issuance Costs, Gross | $ 0.9 |  |  |  |  |
7.00% 2027 Senior Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  | $ 335.4 |
Debt Instrument, Interest Rate, Stated Percentage | 7.00% |  |  |  |  |
Debt Issuance Costs, Gross | $ 1.3 |  |  |  |  |
9.875% 2025 Senior Secured Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt, Gross |  |  | $ 555.2 | $ 400.0 |  |
Debt issuance, discount rate |  |  | 99.00% | 94.50% |  |
Debt Instrument, Interest Rate, Stated Percentage | 9.875% |  |  |  |  |
Repurchase price if triggering event occurs | 101.00% |  |  |  |  |
Debt Issuance Costs, Gross | $ 9.1 |  |  |  |  |
6.75% 2026 Senior Secured Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt, Gross |  | $ 120.0 |  |  |  | $ 725.0
Debt issuance, discount rate |  | 99.25% |  |  |  | 98.783%
Debt Instrument, Interest Rate, Stated Percentage | 6.75% |  |  |  |  |
Repurchase price if triggering event occurs | 101.00% |  |  |  |  |
Debt Issuance Costs, Gross | $ 23.7 |  |  |  |  |
Cleveland-Cliffs Inc. [Member] | 6.375% 2025 Senior Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt, Gross | 64.3 |  |  |  |  |
Cleveland-Cliffs Inc. [Member] | 7.00% 2027 Senior Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt, Gross | $ 88.0 |  |  |  |  |
Repurchase price if triggering event occurs | 101.00% |  |  |  |  |
Cleveland-Cliffs Inc. [Member] | 9.875% 2025 Senior Secured Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt, Gross | $ 955.2 |  |  |  |  |
Cleveland-Cliffs Inc. [Member] | 6.75% 2026 Senior Secured Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt, Gross | 845.0 |  |  |  |  |
AK Steel Holding Corporation [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Unsecured Long-term Debt, Noncurrent | 141.0 |  |  |  |  |
AK Steel Holding Corporation [Member] | Unsecured Industrial Revenue Bonds [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt, Gross | $ 66.0 |  |  |  |  |
Debt, Weighted Average Interest Rate | 6.86% |  |  |  |  |
AK Steel Holding Corporation [Member] | Secured Industrial Revenue Bonds [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt, Gross | $ 26.0 |  |  |  |  |

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