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CONTINGENCIES, COMMITMENTS AND RESTRICTIONS ON THE DISTRIBUTION OF PROFITS (Fishermen association claims, Tax assessment relating to the use of certain ICMS tax credits) (Details) - USD ($) $ in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 07, 2017 | Dec. 31, 2020 | Dec. 31, 2021 | Mar. 31, 2005
Disclosure of contingent liabilities [line items] |  |  |  |
Tax incentive grant period |  |  |  | 20 years
Gain from derecognition of contingent liabilities |  | $ 186.0 |  |
Thyssenkrupp Slab International B.V. & CSA Siderúrgica do Atlântico Ltda. |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |
Tax benefit recognised as of acquisition date | $ 1,089.0 |  |  |
Acquisitions through business combinations, other provisions | 651.8 |  |  |
Asset recognised for expected reimbursement, contingent liabilities in business combination | $ 325.9 | 194.1 |  |
Contingency amount recoverable, percent | 50.00% |  |  |
Contingent liabilities recognised in business combination |  | 380.1 |  |
Thyssenkrupp Slab International B.V. & CSA Siderúrgica do Atlântico Ltda. | Other environment related provision |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |
Other provisions | $ 24.5 | 10.9 | $ 8.8 |
Thyssenkrupp Slab International B.V. & CSA Siderúrgica do Atlântico Ltda. | Legal proceedings contingent liability |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |
Other provisions | $ 57.7 | $ 34.9 | $ 32.5 |

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