Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating activities
Net income	$ 981,890	$ 954,327	$ 839,497
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	109,983	92,010	75,571
Stock-based compensation	116,086	121,416	80,071
Provision for credit losses on accounts and other receivables	125,152	131,096	37,919
Amortization of deferred financing costs and discounts	7,249	7,748	6,831
Amortization of intangible assets and premium on receivables	226,621	230,272	208,625
Deferred income taxes	(46,678)	(33,174)	11,026
Loss on extinguishment of debt	0	1,934	16,194
Gain on sale of assets/business	(13,712)	0	0
Other non-cash operating expense (income), net	637	1,664	(793)
Changes in operating assets and liabilities (net of acquisitions/disposition):
Accounts receivable and other receivables	(210,261)	(598,674)	(731,137)
Prepaid expenses and other current assets	69,287	(17,543)	141,058
Derivative assets and liabilities, net	(33,278)	(11,260)	(15,360)
Other assets	54,180	(41,068)	47,055
Accounts payable, accrued expenses and customer deposits	713,976	(83,951)	480,506
Net cash provided by operating activities	2,101,132	754,797	1,197,063
Investing activities
Acquisitions, net of cash acquired	(428,327)	(216,917)	(602,120)
Purchases of property and equipment	(153,822)	(151,428)	(111,530)
Proceeds from disposal of a business, net of cash disposed	197,025	0	0
Other	4,401	0	(2,281)
Net cash used in investing activities	(380,723)	(368,345)	(715,931)
Financing activities
Proceeds from issuance of common stock	113,742	49,404	48,781
Repurchase of common stock	(686,859)	(1,405,200)	(1,355,722)
Borrowings on securitization facility, net	20,000	169,000	418,000
Deferred financing costs	(376)	(10,355)	(38,920)
Proceeds from notes payable	0	3,000,000	1,900,000
Principal payments on notes payable	(94,000)	(2,824,000)	(507,500)
Borrowings from revolver	8,734,960	7,236,000	1,910,000
Payments on revolver	(9,118,960)	(6,526,000)	(1,978,851)
Borrowings (payments) on swing line of credit, net	135,568	194	(51,049)
Other	(2,286)	(271)	(811)
Net cash (used in) provided by financing activities	(898,211)	(311,228)	343,928
Effect of foreign currency exchange rates on cash	30,157	(36,739)	(50,984)
Net increase in cash and cash equivalents and restricted cash	852,355	38,485	774,076
Cash, cash equivalents and restricted cash at beginning of period	2,289,180	2,250,695	1,476,619
Cash, cash equivalents and restricted cash at end of period	3,141,535	2,289,180	2,250,695
Supplemental cash flow information
Cash paid for interest	448,384	229,641	132,504
Cash paid for income taxes	$ 408,340	$ 358,231	$ 229,721