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Pensions and other benefits - Pension Plan Asset Allocation and Weighted-Average Policy Range (Details) - Pensions
Dec. 31, 2022
Dec. 31, 2021
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]    
Asset allocation target 100.00%  
Percentage of plan assets 100.00% 100.00%
Cash and cash equivalents    
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]    
Asset allocation target 1.20%  
Percentage of plan assets 1.10% 3.10%
Fixed income    
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]    
Asset allocation target 24.40%  
Percentage of plan assets 20.50% 24.10%
Public equity    
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]    
Asset allocation target 45.00%  
Percentage of plan assets 46.40% 50.50%
Real estate and infrastructure    
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]    
Asset allocation target 9.80%  
Percentage of plan assets 11.40% 6.70%
Private debt    
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]    
Asset allocation target 9.80%  
Percentage of plan assets 7.70% 4.60%
Absolute return    
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]    
Asset allocation target 9.80%  
Percentage of plan assets 12.90% 11.00%
Minimum | Fixed income    
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]    
Policy range 20.00%  
Minimum | Public equity    
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]    
Policy range 35.00%  
Minimum | Real estate and infrastructure    
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]    
Policy range 4.00%  
Minimum | Private debt    
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]    
Policy range 4.00%  
Minimum | Absolute return    
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]    
Policy range 4.00%  
Maximum | Cash and cash equivalents    
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]    
Policy range 10.00%  
Maximum | Fixed income    
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]    
Policy range 40.00%  
Maximum | Public equity    
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]    
Policy range 55.00%  
Maximum | Real estate and infrastructure    
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]    
Policy range 13.00%  
Maximum | Private debt    
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]    
Policy range 13.00%  
Maximum | Absolute return    
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]    
Policy range 13.00%