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Basis of preparation (Tables)
12 Months Ended
Dec. 31, 2020
Corporate Information And Statement Of IFRS Compliance [Abstract]  
Key Accounting Estimates and Judgements
Principal accounting policiesKey accounting estimates and judgementsNoteEstimation risk
US net sales and rebatesEstimate of US sales deductions and provisions for sales rebates2.1High
Income taxes and deferred income taxes
Judgement and estimate regarding deferred income tax assets and provision for uncertain tax positions2.6
Medium
Intangible assets
Estimate regarding impairment of assets and judgement of whether a transaction is an asset acquisition or a business combination3.1
Low
InventoriesEstimate of indirect production costs capitalised and inventory write-down3.3Low
Provisions and contingent liabilitiesEstimate of ongoing legal disputes, litigation and investigations3.6Medium