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Fair value measurement - Schedule of Changes in Fair Value of Pension Plan Assets and Liabilities, Categorized as Level 3 (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Assets:    
Fair value of plan assets at beginning of period $ 1,661,378  
Fair value of plan assets at end of period 1,495,213 $ 1,661,378
Level 3    
Assets:    
Fair value of plan assets at beginning of period 296,266 352,130
Actual return on plan assets - Relating to assets still held at report date 16,309 (12,083)
Actual return on plan assets - Relating to assets sold/redeemed during the period 0 7
Purchases 27,480 39,243
Sales (61,772) (30,573)
Settlements (9,176) (52,458)
Fair value of plan assets at end of period 269,107 296,266
Real estate | Level 3    
Assets:    
Fair value of plan assets at beginning of period 124,790 133,503
Actual return on plan assets - Relating to assets still held at report date 10,468 (2,039)
Actual return on plan assets - Relating to assets sold/redeemed during the period 0 0
Purchases 0 0
Sales (28,893) (6,674)
Settlements 0 0
Fair value of plan assets at end of period 106,365 124,790
Partnership/joint venture interests | Level 3    
Assets:    
Fair value of plan assets at beginning of period 171,476 169,932
Actual return on plan assets - Relating to assets still held at report date 5,841 (10,044)
Actual return on plan assets - Relating to assets sold/redeemed during the period 0 0
Purchases 27,480 39,243
Sales (32,879) (23,899)
Settlements (9,176) (3,756)
Fair value of plan assets at end of period 162,742 171,476
Hedge funds | Level 3    
Assets:    
Fair value of plan assets at beginning of period $ 0 48,695
Actual return on plan assets - Relating to assets still held at report date   0
Actual return on plan assets - Relating to assets sold/redeemed during the period   7
Purchases   0
Sales   0
Settlements   (48,702)
Fair value of plan assets at end of period   $ 0