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Financial Risk Management and Financial Instruments - Summary of Weightings Applied to Valuation Method (Details)
12 Months Ended
Dec. 31, 2018
PWERM  
Disclosure Of Financial Risk Management And Financial Instruments [Line Items]  
Percentage of weightings 50.00%
Secondary Market Transactions  
Disclosure Of Financial Risk Management And Financial Instruments [Line Items]  
Percentage of weightings 50.00%