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OTHER LIABILITIES - NON CURRENT AND CURRENT (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of defined benefit plans [line items]    
Net Defined Benefit Liability (Asset) Guaranteed With Property, Plant And Equipment $ 275.0  
Bottom of range    
Disclosure of defined benefit plans [line items]    
Estimate of contributions expected to be paid to plan for next five years 178.9  
Top of range    
Disclosure of defined benefit plans [line items]    
Estimate of contributions expected to be paid to plan for next five years $ 197.3  
Fair value of plan assets | Usiminas    
Disclosure of defined benefit plans [line items]    
Number of shares outstanding (shares) 34,109,762 34,109,762