Income taxes - Schedule of Reconciliation of Effective Tax Rate (Details)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
U.S. statutory tax rate	21.00%	21.00%	21.00%
Increase (decrease) in taxes resulting from:
State taxes (net of federal income tax benefit)	2.30%	2.70%	2.60%
Uncertain tax positions, settlements and lapse of statutes of limitations	(0.20%)	0.00%	0.30%
Valuation allowance on equity method investment	(0.70%)	0.60%	0.00%
Other valuation allowances, tax rate changes, & deferred adjustments	0.80%	(0.60%)	(1.70%)
Non-deductible transaction costs	(0.80%)	0.50%	0.10%
Net excess benefits or expense on share-based payments	(0.10%)	(0.30%)	(0.20%)
Non-taxable Merger termination fee	(1.30%)	0.00%	0.00%
Other, net	0.50%	0.40%	0.00%
Effective tax rate	21.50%	24.30%	22.10%