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Pension and other post-employment benefits (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Non-service costs        
Non-service costs $ 3,975 $ 5,306 $ 7,413 $ 10,267
Pension benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 2,969 3,166 6,053 6,093
Non-service costs        
Interest cost 8,061 7,906 16,494 16,299
Expected return on plan assets (8,603) (7,947) (17,300) (16,263)
Amortization of net actuarial gains (321) (71) (712) (195)
Amortization of prior service credits (359) (373) (719) (746)
Impact of regulatory accounts 4,384 4,588 8,755 8,683
Non-service costs 3,162 4,103 6,518 7,778
Net benefit cost 6,131 7,269 12,571 13,871
OPEB        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 780 902 1,560 1,891
Non-service costs        
Interest cost 2,674 2,891 5,327 6,329
Expected return on plan assets (2,644) (2,331) (5,288) (5,077)
Amortization of net actuarial gains (867) (561) (2,466) (1,122)
Amortization of prior service credits (213) (213) (426) (426)
Impact of regulatory accounts 1,863 1,417 3,748 2,785
Non-service costs 813 1,203 895 2,489
Net benefit cost $ 1,593 $ 2,105 $ 2,455 $ 4,380