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Pension and other post-employment benefits - Schedule of Components of Net Benefit Costs for Pension Plans and OPEB Recorded as Part of Administrative Expenses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Non-service costs    
Non-service costs $ 14,097 $ 19,885
Pension benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 13,625 11,725
Non-service costs    
Interest cost 33,260 33,633
Expected return on plan assets (34,555) (31,990)
Amortization of net actuarial loss (1,499) (852)
Amortization of prior service credits (1,468) (1,491)
Amortization due to plan settlements 15,603 16,258
Non-service costs 11,341 15,558
Net benefit cost 24,966 27,283
OPEB    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 2,901 3,253
Non-service costs    
Interest cost 11,052 11,510
Expected return on plan assets (10,527) (9,736)
Amortization of net actuarial loss (3,499) (3,559)
Amortization of prior service credits (853) (853)
Amortization due to plan settlements 6,583 6,965
Non-service costs 2,756 4,327
Net benefit cost $ 5,657 $ 7,580