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Accumulated other comprehensive loss - Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning Balance     $ 3,004,714  
Beginning balance $ 3,093,323 $ 2,801,100 3,004,714 $ 2,704,872
Amounts reclassified from AOCL 496 1,112 2,608 3,333
Other comprehensive income, net of tax 496 1,112 2,608 3,333
Ending balance 3,116,264 2,871,368 3,116,264 2,871,368
Ending Balance 3,116,264   3,116,264  
Total        
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning Balance (104,532) (117,389) (106,644) (119,610)
Beginning balance (104,532) (117,389) (106,644) (119,610)
Amounts reclassified from AOCL 496 1,112 2,608 3,333
Other comprehensive income, net of tax 496 1,112 2,608 3,333
Ending balance (104,036) (116,277) (104,036) (116,277)
Ending Balance (104,036) (116,277) (104,036) (116,277)
Retirement Plans        
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance (105,064) (117,921) (107,176) (120,142)
Amounts reclassified from AOCL 1,028 1,112 3,140 3,333
Other comprehensive income, net of tax 1,028 1,112 3,140 3,333
Ending balance (104,036) (116,809) (104,036) (116,809)
Foreign Currency        
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning Balance 532 532 532 532
Amounts reclassified from AOCL (532) 0 (532) 0
Other comprehensive income, net of tax (532) 0 (532) 0
Ending Balance $ 0 $ 532 $ 0 $ 532