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ACCOUNTING POLICIES (Intangible assets) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of detailed information about intangible assets [line items] |  |  |
Mining concession, period | 50 years |  |
Mining concession, additional term | 50 years |  |
Research and development expense | $ 9.8 | $ 9.2 | $ 6.2
Information system projects |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Amortisation period (not exceeding) | 3 years |  |
Customer relationships and other contractual rights |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Useful lives or amortisation rates, intangible assets other than goodwill | P10Y |  |
Cash-generating units |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Goodwill | $ 662.3 |  |
Steel | Cash-generating units |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Goodwill | $ 619.8 |  |
Mining |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Amortisation rates, intangible assets other than goodwill | 7.00% | 7.00% | 10.00%
Mining | Cash-generating units |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Goodwill | $ 42.5 |  |
Bottom of range | Trademarks |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Useful lives or amortisation rates, intangible assets other than goodwill | P5Y |  |
Top of range | Trademarks |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Useful lives or amortisation rates, intangible assets other than goodwill | P10Y |  |

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