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v3.21.1

Summary of significant accounting policies - Narrative (Details) | 12 Months Ended
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Dec. 31, 2020 contract
Disclosure of detailed information about intangible assets [line items] |
Number of power agreements | 2
Expiration Date 2042 |
Disclosure of detailed information about intangible assets [line items] |
Power agreement terms | 15 years
Expiration date 2024 |
Disclosure of detailed information about intangible assets [line items] |
Power agreement terms | 15 years
Expiration date 2025 |
Disclosure of detailed information about intangible assets [line items] |
Power agreement terms | 15 years
Trademarks | Bottom of range |
Disclosure of detailed information about intangible assets [line items] |
Useful lives of intangible assets | 10 years
Trademarks | Top of range |
Disclosure of detailed information about intangible assets [line items] |
Useful lives of intangible assets | 20 years
Software | Bottom of range |
Disclosure of detailed information about intangible assets [line items] |
Useful lives of intangible assets | 3 years
Software | Top of range |
Disclosure of detailed information about intangible assets [line items] |
Useful lives of intangible assets | 5 years

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