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v3.21.1

Critical accounting estimates and judgments - Key Assumptions (Details) | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019
Disclosure of information for cash-generating units [line items] |  |
Future pricing increases (as a percent) | 1.76% | 0.11%
Future cost increases (as a percent) | 0.33% | 0.78%
Discount rates (as a percent) | 7.00% | 7.00%
Perpetuity growth rate (as a percent) | 1.00% | 1.00%
UMA |  |
Disclosure of information for cash-generating units [line items] |  |
Financial projections (in years) | 4 years | 4 years
AVI |  |
Disclosure of information for cash-generating units [line items] |  |
Financial projections (in years) | 7 years | 7 years
Bottom of range |  |
Disclosure of information for cash-generating units [line items] |  |
Yield average growth rates (as a percent) | 0.00% | 0.00%
Top of range |  |
Disclosure of information for cash-generating units [line items] |  |
Yield average growth rates (as a percent) | 1.00% | 1.00%

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