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SIGNIFICANT ACCOUNTING POLICIES (Tables)
6 Months Ended
Jun. 30, 2021
Corporate Information And Statement Of IFRS Compliance [Abstract]  
Disclosure of estimated useful lives of property, plant and equipment Property, plant and equipment are depreciated on a straight line or declining-balance basis over the estimated useful lives of each component of the assets as follows:
Buildings
Up to 50 years
Machinery and equipment
Up to 5 years
Network systems
Up to 60 years