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FINANCIAL LIABILITIES - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure of detailed information about financial instruments [line items] |  |
Deferred consideration, annual interest accrual | 3.35% |
Dividends recognised as distributions to owners | $ 66 |
Exchangeable and class B shares(2) |  |
Disclosure of detailed information about financial instruments [line items] |  |
Exchangeable share conversion, value | $ 55 |
Exchangeable shares outstanding (Shares) |  |
Disclosure of detailed information about financial instruments [line items] |  |
Exchangeable share conversion (in shares) | 1,388,874 |
Combined share capital |  |
Disclosure of detailed information about financial instruments [line items] |  |
Number of share issued (in dollars per share) | $ 38.09 |
Number of share issued, opening (in dollar per share) | $ 49.40 | $ 0

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