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Commitments and contingencies - Narrative (Details)
 12 Months Ended
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Nov. 30, 2024
party
Jan. 31, 2017
USD ($)
Dec. 31, 2000
party
Other Commitments [Line Items]            
Potential liabilities related to litigation and environmental matters $ 3,300,000 $ 6,600,000        
Insurance receivables $ 0 459,000        
Number of parties issued general notice letters | party           150
Number of other responsible parties | party       60   100
Environmental remediation period (in years)         13 years  
Environmental remediation, percent of site to be remediated         100.00%  
Maximum commitment terms (in years) 45 years          
Purchased under various commitments during the year $ 135,300,000 $ 128,300,000 $ 128,700,000      
Guarantor obligations, maximum exposure, undiscounted 11,500,000          
Amount outstanding under guarantees that is reflected on balance sheet 0          
Letters of credit set to expire - 2026 11,900,000          
Letters of credit set to expire - 2027 11,300,000          
Letters of credit set to expire - 2028 175,000          
Outstanding letters of credit $ 0          
Surety bond expiration period 12 months          
Amount of surety bonds outstanding $ 858,300,000          
Letter of Credit            
Other Commitments [Line Items]            
Line of credit, maximum borrowing capacity $ 23,400,000          
Minimum            
Other Commitments [Line Items]            
Environmental remediation expected costs         $ 1,000,000,000  
Maximum            
Other Commitments [Line Items]            
Environmental remediation expected costs         $ 2,000,000,000