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ACCOUNTING POLICIES (Employee Liabilities) (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2024
USD ($)
installment
Dec. 31, 2023
USD ($)
method
plan
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Number of installments, repayment | installment 148  
Monthly fee burden   1
Deferred compensation share-based arrangements, liability $ 86.0 $ 90.1
Stock granted, value $ 94.0 $ 96.6
Usiminas    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Number of post retirement plans | plan   2
Number of payment methods for post retirement plans | method   2
Incentive Retention Program | Capital Units    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Vesting period (years) 4 years  
Redemption, period (years) 10 years  
Early redemption, period (years) 7 years  
Mandatory redemption period (years) 7 years