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Retirement plans - Schedule of Allocation of Plan Assets (Details) - Retirement Plans
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Actual allocation of Plan Assets   100.00% 100.00%
Scenario Forecast      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Target Allocation 100.00%    
Equity securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Target Allocation   14.00%  
Actual allocation of Plan Assets   20.00% 17.00%
Equity securities | Scenario Forecast      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Target Allocation 33.00%    
Debt securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Target Allocation   86.00%  
Actual allocation of Plan Assets   80.00% 83.00%
Debt securities | Scenario Forecast      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Target Allocation 67.00%