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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 |  |

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