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Pensions and other postretirement benefit plans - Schedule of Allocation of Plan Assets (Details) - Retirement Plans
Dec. 31, 2025
Dec. 31, 2024
Defined Benefit Plans and Other Postretirement Benefit Plans    
Target allocation 100.00%  
Allocation of plan assets 100.00% 100.00%
Equity securities    
Defined Benefit Plans and Other Postretirement Benefit Plans    
Target allocation 14.00%  
Allocation of plan assets 10.00% 21.00%
Debt securities    
Defined Benefit Plans and Other Postretirement Benefit Plans    
Target allocation 69.00%  
Allocation of plan assets 72.00% 62.00%
Alternative investments    
Defined Benefit Plans and Other Postretirement Benefit Plans    
Target allocation 17.00%  
Allocation of plan assets 18.00% 17.00%