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Summary of significant accounting policies - Narrative (Details)
 12 Months Ended
Dec. 31, 2022
USD ($)
contract
Disclosure of detailed information about intangible assets [line items]  
Operating lease, capitalization threshold | $ $ 30,000
Number of power agreements | contract 2
Expiration Date 2042  
Disclosure of detailed information about intangible assets [line items]  
Power agreement terms 25 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