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DEBT AND CREDIT FACILITIES - Debt Redemption (Details) | 12 Months Ended
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Dec. 31, 2020
9.875% 2025 Senior Secured Notes | Debt Instrument, Redemption, Period One, Upon Equity Issuance | Cleveland-Cliffs Inc. [Member] |
Debt Instrument, Redemption [Line Items] |
Debt Instrument, Redemption Price, Percentage | 109.875%
9.875% 2025 Senior Secured Notes | Debt Instrument, Redemption, Period One | Cleveland-Cliffs Inc. [Member] |
Debt Instrument, Redemption [Line Items] |
Debt Instrument, Redemption Price, Percentage | 100.00%
9.875% 2025 Senior Secured Notes | Debt Instrument, Redemption, Period Two | Cleveland-Cliffs Inc. [Member] |
Debt Instrument, Redemption [Line Items] |
Debt Instrument, Redemption Price, Percentage | 107.406%
9.875% 2025 Senior Secured Notes | Debt Instrument, Redemption, Period Three | Cleveland-Cliffs Inc. [Member] |
Debt Instrument, Redemption [Line Items] |
Debt Instrument, Redemption Price, Percentage | 104.938%
9.875% 2025 Senior Secured Notes | Debt Instrument, Redemption, Period Four | Cleveland-Cliffs Inc. [Member] |
Debt Instrument, Redemption [Line Items] |
Debt Instrument, Redemption Price, Percentage | 102.469%
9.875% 2025 Senior Secured Notes | Debt Instrument, Redemption, Period Five [Member] | Cleveland-Cliffs Inc. [Member] |
Debt Instrument, Redemption [Line Items] |
Debt Instrument, Redemption Price, Percentage | 100.00%
6.75% 2026 Senior Secured Notes | Debt Instrument, Redemption, Period One, Upon Equity Issuance | Cleveland-Cliffs Inc. [Member] |
Debt Instrument, Redemption [Line Items] |
Debt Instrument, Redemption Price, Percentage | 106.75%
6.75% 2026 Senior Secured Notes | Debt Instrument, Redemption, Period One | Cleveland-Cliffs Inc. [Member] |
Debt Instrument, Redemption [Line Items] |
Debt Instrument, Redemption Price, Percentage | 100.00%
6.75% 2026 Senior Secured Notes | Debt Instrument, Redemption, Period Two | Cleveland-Cliffs Inc. [Member] |
Debt Instrument, Redemption [Line Items] |
Debt Instrument, Redemption Price, Percentage | 105.063%
6.75% 2026 Senior Secured Notes | Debt Instrument, Redemption, Period Three | Cleveland-Cliffs Inc. [Member] |
Debt Instrument, Redemption [Line Items] |
Debt Instrument, Redemption Price, Percentage | 103.375%
6.75% 2026 Senior Secured Notes | Debt Instrument, Redemption, Period Four | Cleveland-Cliffs Inc. [Member] |
Debt Instrument, Redemption [Line Items] |
Debt Instrument, Redemption Price, Percentage | 101.688%
6.75% 2026 Senior Secured Notes | Debt Instrument, Redemption, Period Five [Member] | Cleveland-Cliffs Inc. [Member] |
Debt Instrument, Redemption [Line Items] |
Debt Instrument, Redemption Price, Percentage | 100.00%
4.875% 2024 Senior Secured Notes | Debt Instrument, Redemption, Period One | Cleveland-Cliffs Inc. [Member] |
Debt Instrument, Redemption [Line Items] |
Debt Instrument, Redemption Price, Percentage | 102.438%
4.875% 2024 Senior Secured Notes | Debt Instrument, Redemption, Period Two | Cleveland-Cliffs Inc. [Member] |
Debt Instrument, Redemption [Line Items] |
Debt Instrument, Redemption Price, Percentage | 101.219%
4.875% 2024 Senior Secured Notes | Debt Instrument, Redemption, Period Three | Cleveland-Cliffs Inc. [Member] |
Debt Instrument, Redemption [Line Items] |
Debt Instrument, Redemption Price, Percentage | 100.00%
6.375% 2025 Senior Notes | Debt Instrument, Redemption, Period One | Cleveland-Cliffs Inc. [Member] |
Debt Instrument, Redemption [Line Items] |
Debt Instrument, Redemption Price, Percentage | 103.188%
6.375% 2025 Senior Notes | Debt Instrument, Redemption, Period Two | Cleveland-Cliffs Inc. [Member] |
Debt Instrument, Redemption [Line Items] |
Debt Instrument, Redemption Price, Percentage | 101.594%
6.375% 2025 Senior Notes | Debt Instrument, Redemption, Period Three | Cleveland-Cliffs Inc. [Member] |
Debt Instrument, Redemption [Line Items] |
Debt Instrument, Redemption Price, Percentage | 100.00%
7.00% 2027 Senior Notes | Debt Instrument, Redemption, Period One | Cleveland-Cliffs Inc. [Member] |
Debt Instrument, Redemption [Line Items] |
Debt Instrument, Redemption Price, Percentage | 100.00%
7.00% 2027 Senior Notes | Debt Instrument, Redemption, Period Two | Cleveland-Cliffs Inc. [Member] |
Debt Instrument, Redemption [Line Items] |
Debt Instrument, Redemption Price, Percentage | 103.50%
7.00% 2027 Senior Notes | Debt Instrument, Redemption, Period Three | Cleveland-Cliffs Inc. [Member] |
Debt Instrument, Redemption [Line Items] |
Debt Instrument, Redemption Price, Percentage | 102.333%
7.00% 2027 Senior Notes | Debt Instrument, Redemption, Period Four | Cleveland-Cliffs Inc. [Member] |
Debt Instrument, Redemption [Line Items] |
Debt Instrument, Redemption Price, Percentage | 101.167%
7.00% 2027 Senior Notes | Debt Instrument, Redemption, Period Five [Member] | Cleveland-Cliffs Inc. [Member] |
Debt Instrument, Redemption [Line Items] |
Debt Instrument, Redemption Price, Percentage | 100.00%
7.50% 2023 AK Senior Notes [Member] | Debt Instrument, Redemption, Period One | AK Steel [Member] |
Debt Instrument, Redemption [Line Items] |
Debt Instrument, Redemption Price, Percentage | 101.875%
7.50% 2023 AK Senior Notes [Member] | Debt Instrument, Redemption, Period Two | AK Steel [Member] |
Debt Instrument, Redemption [Line Items] |
Debt Instrument, Redemption Price, Percentage | 100.00%
6.375% 2025 AK Senior Notes | Debt Instrument, Redemption, Period One | AK Steel [Member] |
Debt Instrument, Redemption [Line Items] |
Debt Instrument, Redemption Price, Percentage | 103.188%
6.375% 2025 AK Senior Notes | Debt Instrument, Redemption, Period Two | AK Steel [Member] |
Debt Instrument, Redemption [Line Items] |
Debt Instrument, Redemption Price, Percentage | 101.594%
6.375% 2025 AK Senior Notes | Debt Instrument, Redemption, Period Three | AK Steel [Member] |
Debt Instrument, Redemption [Line Items] |
Debt Instrument, Redemption Price, Percentage | 100.00%
7.00% 2027 AK Senior Notes | Debt Instrument, Redemption, Period One | AK Steel [Member] |
Debt Instrument, Redemption [Line Items] |
Debt Instrument, Redemption Price, Percentage | 100.00%
7.00% 2027 AK Senior Notes | Debt Instrument, Redemption, Period Two | AK Steel [Member] |
Debt Instrument, Redemption [Line Items] |
Debt Instrument, Redemption Price, Percentage | 103.50%
7.00% 2027 AK Senior Notes | Debt Instrument, Redemption, Period Three | AK Steel [Member] |
Debt Instrument, Redemption [Line Items] |
Debt Instrument, Redemption Price, Percentage | 102.333%
7.00% 2027 AK Senior Notes | Debt Instrument, Redemption, Period Four | AK Steel [Member] |
Debt Instrument, Redemption [Line Items] |
Debt Instrument, Redemption Price, Percentage | 101.167%
7.00% 2027 AK Senior Notes | Debt Instrument, Redemption, Period Five [Member] | AK Steel [Member] |
Debt Instrument, Redemption [Line Items] |
Debt Instrument, Redemption Price, Percentage | 100.00%
1.50% 2025 Convertible Senior Notes |
Debt Instrument, Redemption [Line Items] |
Debt Instrument, Redemption Price, Percentage | 100.00%
5.875% 2027 Senior Notes | Debt Instrument, Redemption, Period One, Upon Equity Issuance | Cleveland-Cliffs Inc. [Member] |
Debt Instrument, Redemption [Line Items] |
Debt Instrument, Redemption Price, Percentage | 105.875%
5.875% 2027 Senior Notes | Debt Instrument, Redemption, Period One | Cleveland-Cliffs Inc. [Member] |
Debt Instrument, Redemption [Line Items] |
Debt Instrument, Redemption Price, Percentage | 100.00%
6.25% 2040 Senior Notes | Debt Instrument, Redemption, Period One | Cleveland-Cliffs Inc. [Member] |
Debt Instrument, Redemption [Line Items] |
Debt Instrument, Redemption Price, Percentage | 100.00%
7.625% 2021 AK Senior Notes | Debt Instrument, Redemption, Period Two | AK Steel [Member] |
Debt Instrument, Redemption [Line Items] |
Debt Instrument, Redemption Price, Percentage | 100.00%

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- Definition Percentage price of original principal amount of debt at which debt can be redeemed by the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph e -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 + Details
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