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DEBT AND CREDIT FACILITIES (Narrative) (Details) - USD ($) $ in Millions |  |  |  | 3 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 24, 2020 | Mar. 27, 2020 | Mar. 13, 2020 | Mar. 31, 2020 | Mar. 31, 2019 | Apr. 17, 2020 | Dec. 31, 2019
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  | $ 4,570.5 |  |  |
Extinguishment of Debt, Amount |  |  |  | 739.9 | $ 10.0 |  |
6.75% 2026 Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  | $ 725.0 |  |  |
Debt issuance, discount rate |  |  |  | 98.783% |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 6.75% |  |  |
Repurchase price if triggering event occurs |  |  |  | 101.00% |  |  |
Debt Issuance Costs, Gross |  |  |  | $ 20.5 |  |  |
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 |  |  |
7.625% 2021 AK Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  |  |  | 100.00% |  |  |
Extinguishment of Debt, Amount |  | $ 8.5 | $ 364.2 | $ 372.7 |  |  |
7.50% 2023 AK Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Extinguishment of Debt, Amount |  | $ 56.5 | $ 310.7 | 367.2 |  |  |
Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  | 2,000.0 |  |  |
Sublimit for letters of credit |  |  |  | 555.0 |  |  |
Sublimit for swingline loans |  |  |  | 125.0 |  |  |
FILO Tranche Commitments |  |  |  | $ 150.0 |  |  |
Fixed Charge Coverage Ratio |  |  |  | 1.0 |  |  |
Cleveland-Cliffs Inc. [Member] | 6.375% 2025 Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  | $ 231.8 |  |  |
Cleveland-Cliffs Inc. [Member] | 7.00% 2027 Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  | $ 335.4 |  |  |
Repurchase price if triggering event occurs |  |  |  | 101.00% |  |  |
Cleveland-Cliffs Inc. [Member] | Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  | $ 2,000.0 |  |  | $ 450.0
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 |  |  |  | 73.3 |  |  |
AK Steel Holding Corporation [Member] | Industrial Revenue Bonds [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  | $ 99.3 |  |  |
Debt, Weighted Average Interest Rate |  |  |  | 6.80% |  |  |
AK Steel Holding Corporation [Member] | Secured Industrial Revenue Bonds [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  | $ 26.0 |  |  |
AK Steel Holding Corporation [Member] | 7.625% 2021 AK Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  | 33.5 |  |  |
AK Steel Holding Corporation [Member] | 7.50% 2023 AK Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  | $ 12.8 |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Extinguishment of Debt, Amount | $ 736.4 |  |  |  |  |  |
Reduction of Principal Long-Term Debt | 181.3 |  |  |  |  |  |
Subsequent Event [Member] | 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% |

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