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DEBT AND CREDIT FACILITIES - Schedule Of Long-Term Debt (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Jun. 19, 2020 | Apr. 24, 2020 | Apr. 17, 2020 | Mar. 16, 2020 | Mar. 13, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term Debt, Gross | $ 4,640.7 |  |  |  |  |  |
LONG-TERM DEBT | 4,451.6 |  |  |  |  |  | $ 2,113.8
9.875% 2025 Senior Secured Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term Debt, Gross |  |  | $ 555.2 | $ 400.0 |  |  |
6.75% 2026 Senior Secured Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term Debt, Gross |  | $ 120.0 |  |  |  | $ 725.0 |
6.375% 2025 Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  | $ 231.8 |  |
7.00% 2027 Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  | $ 335.4 |  |
Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term Line of Credit | $ 550.0 |  |  |  |  |  |
Cleveland-Cliffs Inc. [Member] | 4.875% 2024 Senior Secured Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 5.00% |  |  |  |  |  | 5.00%
Long-term Debt, Gross | $ 394.5 |  |  |  |  |  | $ 400.0
Unamortized Debt Issuance Expense | (4.0) |  |  |  |  |  | (4.6)
Debt Instrument, Unamortized Discount | (1.6) |  |  |  |  |  | (1.8)
Long-term Debt | $ 388.9 |  |  |  |  |  | $ 393.6
Cleveland-Cliffs Inc. [Member] | 9.875% 2025 Senior Secured Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 10.57% |  |  |  |  |  |
Long-term Debt, Gross | $ 955.2 |  |  |  |  |  |
Unamortized Debt Issuance Expense | (8.7) |  |  |  |  |  |
Debt Instrument, Unamortized Discount | (26.7) |  |  |  |  |  |
Long-term Debt | $ 919.8 |  |  |  |  |  |
Cleveland-Cliffs Inc. [Member] | 6.75% 2026 Senior Secured Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 6.99% |  |  |  |  |  |
Long-term Debt, Gross | $ 845.0 |  |  |  |  |  |
Unamortized Debt Issuance Expense | (22.6) |  |  |  |  |  |
Debt Instrument, Unamortized Discount | (9.4) |  |  |  |  |  |
Long-term Debt | $ 813.0 |  |  |  |  |  |
Cleveland-Cliffs Inc. [Member] | 6.375% 2025 Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 8.11% |  |  |  |  |  |
Long-term Debt, Gross | $ 64.3 |  |  |  |  |  |
Unamortized Debt Issuance Expense | (0.2) |  |  |  |  |  |
Debt Instrument, Unamortized Discount | (4.8) |  |  |  |  |  |
Long-term Debt | $ 59.3 |  |  |  |  |  |
Cleveland-Cliffs Inc. [Member] | 1.50% 2025 Convertible Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 6.26% |  |  |  |  |  | 6.26%
Long-term Debt, Gross | $ 296.3 |  |  |  |  |  | $ 316.3
Unamortized Debt Issuance Expense | (3.9) |  |  |  |  |  | (4.6)
Debt Instrument, Unamortized Discount | (55.6) |  |  |  |  |  | (65.0)
Long-term Debt | $ 236.8 |  |  |  |  |  | $ 246.7
Cleveland-Cliffs Inc. [Member] | 5.75% 2025 Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 6.01% |  |  |  |  |  | 6.01%
Long-term Debt, Gross | $ 396.2 |  |  |  |  |  | $ 473.3
Unamortized Debt Issuance Expense | (2.8) |  |  |  |  |  | (3.6)
Debt Instrument, Unamortized Discount | (4.3) |  |  |  |  |  | (5.5)
Long-term Debt | $ 389.1 |  |  |  |  |  | $ 464.2
Cleveland-Cliffs Inc. [Member] | 7.00% 2027 Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 9.24% |  |  |  |  |  |
Long-term Debt, Gross | $ 88.0 |  |  |  |  |  |
Unamortized Debt Issuance Expense | (0.3) |  |  |  |  |  |
Debt Instrument, Unamortized Discount | (9.8) |  |  |  |  |  |
Long-term Debt | $ 77.9 |  |  |  |  |  |
Cleveland-Cliffs Inc. [Member] | 5.875% 2027 Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 6.49% |  |  |  |  |  | 6.49%
Long-term Debt, Gross | $ 555.5 |  |  |  |  |  | $ 750.0
Unamortized Debt Issuance Expense | (4.5) |  |  |  |  |  | (6.3)
Debt Instrument, Unamortized Discount | (19.0) |  |  |  |  |  | (27.3)
Long-term Debt | $ 532.0 |  |  |  |  |  | $ 716.4
Cleveland-Cliffs Inc. [Member] | 6.25% 2040 Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 6.34% |  |  |  |  |  | 6.34%
Long-term Debt, Gross | $ 262.7 |  |  |  |  |  | $ 298.4
Unamortized Debt Issuance Expense | (1.9) |  |  |  |  |  | (2.2)
Debt Instrument, Unamortized Discount | (2.8) |  |  |  |  |  | (3.3)
Long-term Debt | $ 258.0 |  |  |  |  |  | 292.9
Cleveland-Cliffs Inc. [Member] | Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 2.79% |  |  |  |  |  |
Long-term Debt, Gross | $ 2,000.0 |  |  |  |  |  | 450.0
Long-term Line of Credit | $ 550.0 |  |  |  |  |  | $ 0.0
AK Steel Holding Corporation [Member] | 7.625% 2021 Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 7.33% |  |  |  |  |  |
Long-term Debt, Gross | $ 33.5 |  |  |  |  |  |
Unamortized Debt Issuance Expense | 0.0 |  |  |  |  |  |
Debt Instrument, Unamortized Premium | 0.1 |  |  |  |  |  |
Long-term Debt | $ 33.6 |  |  |  |  |  |
AK Steel Holding Corporation [Member] | 7.50% 2023 AK Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 6.17% |  |  |  |  |  |
Long-term Debt, Gross | $ 12.8 |  |  |  |  |  |
Unamortized Debt Issuance Expense | 0.0 |  |  |  |  |  |
Debt Instrument, Unamortized Premium | 0.5 |  |  |  |  |  |
Long-term Debt | $ 13.3 |  |  |  |  |  |
AK Steel Holding Corporation [Member] | 6.375% 2025 AK Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 8.11% |  |  |  |  |  |
Long-term Debt, Gross | $ 38.4 |  |  |  |  |  |
Unamortized Debt Issuance Expense | 0.0 |  |  |  |  |  |
Debt Instrument, Unamortized Discount | (2.9) |  |  |  |  |  |
Long-term Debt | $ 35.5 |  |  |  |  |  |
AK Steel Holding Corporation [Member] | 7.00% 2027 AK Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 9.24% |  |  |  |  |  |
Long-term Debt, Gross | $ 56.3 |  |  |  |  |  |
Unamortized Debt Issuance Expense | 0.0 |  |  |  |  |  |
Debt Instrument, Unamortized Discount | (6.2) |  |  |  |  |  |
Long-term Debt | 50.1 |  |  |  |  |  |
AK Steel Holding Corporation [Member] | Industrial Revenue Bonds [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term Debt, Gross | 92.0 |  |  |  |  |  |
Unamortized Debt Issuance Expense | 0.0 |  |  |  |  |  |
Debt Instrument, Unamortized Premium | 2.3 |  |  |  |  |  |
Long-term Debt | $ 94.3 |  |  |  |  |  |

X
- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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