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Financial Risk Management and Financial Instruments - Summary of PWERM Valuations (Details) | 12 Months Ended
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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%

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