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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