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ACCOUNTING POLICIES (Intangible Assets) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of detailed information about intangible assets [line items] |  |  |
Mining concession, period | 50 years |  |
Mining concession, additional term | 50 years |  |
Research and development expense | $ 19.0 | $ 16.3 | $ 9.8
Aggregate cash-generating units for which amount of goodwill or intangible assets with indefinite useful lives is not significant |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Goodwill | $ 662.3 | 662.3 |
Information system projects |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Amortisation period (not exceeding) | 3 years |  |
Mining assets |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Impairment loss recognised in profit or loss, property, plant and equipment | $ 42.3 |  |
Steel | Aggregate cash-generating units for which amount of goodwill or intangible assets with indefinite useful lives is not significant |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Goodwill | $ 619.8 | $ 619.8 |
Mining |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Amortisation rates, intangible assets other than goodwill | 13.00% | 12.00% | 7.00%
Mining | Aggregate cash-generating units for which amount of goodwill or intangible assets with indefinite useful lives is not significant |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Goodwill | $ 42.5 | $ 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 | 5 years |  |
Top of range | Trademarks |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Useful lives or amortisation rates, intangible assets other than goodwill | 10 years |  |

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