CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
OPERATING ACTIVITIES
Net income	$ 526,705	$ 466,379	$ 434,957
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	124,744	113,220	99,752
Stock-based compensation expense	39,707	29,984	24,605
Provision for expected credit losses	35,893	34,026	26,860
Gain on sale of assets, net	(2,332)	(1,492)	(6,635)
Gain on sale of businesses, net	0	0	(15,450)
(Benefit) provision for deferred income taxes	19,152	(10,336)	(7,644)
Other operating activities, net	(758)	0	0
Changes in operating assets and liabilities:
Trade accounts receivable	(36,407)	(49,351)	(45,874)
Financed receivables	(21,460)	(17,299)	(15,794)
Materials and supplies	(1,723)	(5,874)	(4,279)
Other current assets	(4,964)	(24,964)	(16,126)
Accounts payable and accrued expenses	(9,485)	47,670	43,407
Unearned revenue	2,719	7,470	6,777
Other long-term assets and liabilities	6,316	18,220	3,810
Net cash provided by operating activities	678,107	607,653	528,366
INVESTING ACTIVITIES
Acquisitions, net of cash acquired	(309,518)	(157,471)	(366,854)
Capital expenditures	(28,086)	(27,572)	(32,465)
Proceeds from sale of assets	7,480	4,070	12,489
Proceeds from sale of businesses	0	0	15,903
Other investing activities, net	3,425	4,741	(1,968)
Net cash (used in) investing activities	(326,699)	(176,232)	(372,895)
FINANCING ACTIVITIES
Payment of contingent consideration	(14,215)	(39,754)	(12,489)
Issuance of senior notes	492,215	0	0
Borrowings under revolving commitment	11,000	476,000	1,070,000
Borrowings under commercial paper, net	114,430	0	0
Repayments of term loan	0	0	(55,000)
Repayments of revolving commitment	(408,000)	(572,000)	(577,000)
Payment of debt issuance costs	(6,087)	0	0
Payment of dividends	(327,901)	(297,989)	(264,348)
Cash paid for common stock purchased	(216,855)	(11,606)	(315,013)
Other financing activities, net	11,834	4,641	4,430
Net cash (used in) financing activities	(343,579)	(440,708)	(149,420)
Effect of exchange rate changes on cash	2,545	(4,908)	2,428
Net (decrease) increase in cash and cash equivalents	10,374	(14,195)	8,479
Cash and cash equivalents at beginning of period	89,630	103,825	95,346
Cash and cash equivalents at end of period	100,004	89,630	103,825
Supplemental disclosure of cash flow information:
Cash paid for interest	20,177	32,559	19,239
Cash paid for income taxes, net	162,900	145,638	159,154
Non-cash additions to operating lease right-of-use assets	$ 149,278	$ 210,282	$ 146,558