Business segment data - Schedule of Operating Revenues Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 674,833	$ 588,275
Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	708,441	618,602
Corporate, Non-Segment
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	179	37
Intersegment eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ (33,787)	$ (30,364)