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Critical Accounting Estimates and Judgements - Narrative (Details)
Dec. 31, 2020
Bottom of range  
Disclosure of fair value measurement of assets [line items]  
Discount rate used in current measurement of higher of fair value less costs of disposal or previous estimate of value in use 10.00%
Top of range  
Disclosure of fair value measurement of assets [line items]  
Discount rate used in current measurement of higher of fair value less costs of disposal or previous estimate of value in use 12.00%