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SUBSEQUENT EVENTS (Details) - Subsequent Event - Stelco Holdings Inc $ / shares in Units, $ in Billions, $ in Billions | Jul. 12, 2024 USD ($) shares | Jul. 12, 2024 CAD ($) $ / shares shares
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Subsequent Event [Line Items] |  |
Price per share (in dollars per share) |  | $ 70.00
Shares of Cliffs common shares issued to Stelco Holdings stockholders (in shares) | shares | 0.454 | 0.454
Expected enterprise value of acquisition | $ 2.5 | $ 3.4
Stelco Holdings Inc |  |
Subsequent Event [Line Items] |  |
Price per share (in dollars per share) |  | $ 60.00
Cleveland-Cliffs Inc. |  |
Subsequent Event [Line Items] |  |
Price per share (in dollars per share) |  | $ 10.00

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