Business segment data - Schedule of Operating Revenues Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 1,050,516	$ 1,000,795	$ 3,311,886	$ 3,522,020
Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	1,054,646	1,004,592	3,355,897	3,560,199
Corporate, Non-Segment
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	1,433	1,689	4,283	6,412
Intersegment eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ (5,563)	$ (5,486)	$ (48,294)	$ (44,591)