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Critical accounting estimates and judgments - Key Assumptions (Details)
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Disclosure of information for cash-generating units [line items]    
Future pricing increases 2.15% 0.80%
Future cost decrease 0.79% 0.63%
Discount rates 4.00% 5.00%
Perpetuity growth rate 0.50% 1.00%
UMA    
Disclosure of information for cash-generating units [line items]    
Financial projections 5 years 5 years
AVI    
Disclosure of information for cash-generating units [line items]    
Financial projections 5 years 5 years
Bottom of range    
Disclosure of information for cash-generating units [line items]    
Yield average growth rates 0.00% 0.00%
Top of range    
Disclosure of information for cash-generating units [line items]    
Yield average growth rates 2.00% 2.00%