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Biological assets - Measurement of the premises adopted (Details) - ha
 6 Months Ended 12 Months Ended
Jun. 30, 2025
Dec. 31, 2024
Disclosure of detailed information about biological assets [line items]    
Useful productive planted area (hectare) 1,268,890,000 1,243,191,000
Average Annual Growth Volume Per Hectare Per Year 36,800 37,620
Average gross sale price of eucalyptus 103,360 101,380
Label Role Discount rate post-tax 8.40% 8.80%
Mature biological assets [member]    
Disclosure of detailed information about biological assets [line items]    
Useful productive planted area (hectare) 183,841,000 191,737,000
Immature biological assets [member]    
Disclosure of detailed information about biological assets [line items]    
Useful productive planted area (hectare) 1,085,049,000 1,051,454,000