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ACQUISITION OF BUSINESS - Thyssenkrupp Slab International B.V. & CSA Siderrgica do Atlantico Ltda. (Narrative) (Details)
t in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
Sep. 07, 2017
USD ($)
Dec. 31, 2018
USD ($)
installment
MW
t
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Disclosure of detailed information about business combination [line items]          
Asset recognised for expected reimbursement, contingent liabilities in business combination $ 311,394,000   $ 264,683,000 $ 311,394,000  
Prepayments of principal     2,266,560,000 1,205,827,000 $ 1,191,770,000
Total borrowings 3,221,907,000   $ 2,036,957,000 $ 3,221,907,000  
Thyssenkrupp Slab International B.V. & CSA Siderúrgica do Atlântico Ltda.          
Disclosure of detailed information about business combination [line items]          
Percentage of voting equity interests acquired   100.00%      
Annual production capacity of steel (tons) | t     5.0    
Number of megawatts (per year) | MW     490    
Slabs supplied (tons per year) | t     2.0    
Consideration transferred, acquisition-date fair value     $ 1,891,000,000    
Financial instruments designated as hedging instruments, at fair value   $ 75,900,000      
Tax benefit recognised as of acquisition date   1,089,000,000      
Acquisitions through business combinations, other provisions $ 529,400,000 651,800,000      
Asset recognised for expected reimbursement, contingent liabilities in business combination   325,900,000 264,700,000    
Estimated financial effect, contingent liabilities in business combination   1,630,000,000      
Other environment related provision | Thyssenkrupp Slab International B.V. & CSA Siderúrgica do Atlântico Ltda.          
Disclosure of detailed information about business combination [line items]          
Other provisions   24,500,000 19,700,000    
Legal proceedings contingent liability | Thyssenkrupp Slab International B.V. & CSA Siderúrgica do Atlântico Ltda.          
Disclosure of detailed information about business combination [line items]          
Other provisions   $ 57,700,000 $ 46,900,000    
Syndicated Facility | Thyssenkrupp Slab International B.V. & CSA Siderúrgica do Atlântico Ltda.          
Disclosure of detailed information about business combination [line items]          
Debt instrument, term   5 years      
Notional amount   $ 1,500,000,000.0      
Number of installments | installment     8    
Prepayments of principal     $ 375,000,000    
Total borrowings     $ 1,125,000