XML 138 R114.htm IDEA: XBRL DOCUMENT v3.20.4
Financial Risk Management and Financial Instruments - Summary of PWERM Valuations (Details)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2018
Disclosure Of Financial Risk Management And Financial Instruments [Line Items]    
Percentage of weightings 50.00%  
Market Approach Under PWERM | Bottom of Range | High Case Public Company    
Disclosure Of Financial Risk Management And Financial Instruments [Line Items]    
Percentage of weightings   55.00%
Market Approach Under PWERM | Bottom of Range | Low Case Public Company    
Disclosure Of Financial Risk Management And Financial Instruments [Line Items]    
Percentage of weightings   28.00%
Market Approach Under PWERM | Bottom of Range | High Case Transaction    
Disclosure Of Financial Risk Management And Financial Instruments [Line Items]    
Percentage of weightings   0.00%
Market Approach Under PWERM | Bottom of Range | Low Case Transaction    
Disclosure Of Financial Risk Management And Financial Instruments [Line Items]    
Percentage of weightings   0.00%
Market Approach Under PWERM | Top of Range | High Case Public Company    
Disclosure Of Financial Risk Management And Financial Instruments [Line Items]    
Percentage of weightings   70.00%
Market Approach Under PWERM | Top of Range | Low Case Public Company    
Disclosure Of Financial Risk Management And Financial Instruments [Line Items]    
Percentage of weightings   35.00%
Market Approach Under PWERM | Top of Range | High Case Transaction    
Disclosure Of Financial Risk Management And Financial Instruments [Line Items]    
Percentage of weightings   3.00%
Market Approach Under PWERM | Top of Range | Low Case Transaction    
Disclosure Of Financial Risk Management And Financial Instruments [Line Items]    
Percentage of weightings   2.00%
Income and Market Approaches Under PWERM | Bottom of Range    
Disclosure Of Financial Risk Management And Financial Instruments [Line Items]    
Percentage of weightings   2.00%
Income and Market Approaches Under PWERM | Top of Range    
Disclosure Of Financial Risk Management And Financial Instruments [Line Items]    
Percentage of weightings   5.00%