Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended			6 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2023	Sep. 30, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Statement [Abstract]
Revenues, net	$ 970,892	$ 948,174	$ 901,333	$ 1,849,507	$ 2,820,399	$ 3,757,719	$ 3,427,129	$ 2,833,736
Expenses:
Processing	208,217	205,265	204,967	410,232	618,449	819,908	764,707	559,819
Selling	85,954	86,412	81,592	168,004	253,958	340,157	309,082	262,118
General and administrative	147,839	159,356	154,684	314,040	461,879	603,424	584,135	485,830
Depreciation and amortization	84,750	83,676	84,232	167,908	252,658	336,604	322,282	284,197
Other operating, net	(845)	815	663	1,478	633	753	282	(784)
Operating income	444,977	412,650	375,195	787,845	1,232,822	1,656,873	1,446,641	1,242,556
Investment (gain) loss, net	30	18	(190)	(172)	(142)	(116)	1,382	(9)
Other (income) expense, net	(13,432)	(2,424)	746	(1,678)	(15,110)	(16,623)	3,003	3,858
Interest expense, net	88,285	88,486	79,795	168,281	256,566	348,607	164,662	113,705
Loss on extinguishment of debt						0	1,934	16,194
Total other expense, net	74,883	86,080	80,351	166,431	241,314	331,868	170,981	133,748
Income before income taxes	370,094	326,570	294,844	621,414	991,508	1,325,005	1,275,660	1,108,808
Provision for income taxes	98,598	86,868	80,009	166,877	265,475	343,115	321,333	269,311
Net income	$ 271,496	$ 239,702	$ 214,835	$ 454,537	$ 726,033	$ 981,890	$ 954,327	$ 839,497
Earnings per share:
Basic earnings per share (in dollars per share)	$ 3.71	$ 3.24	$ 2.92	$ 6.17	$ 9.87	$ 13.42	$ 12.62	$ 10.23
Diluted earnings per share (in dollars per share)	$ 3.64	$ 3.20	$ 2.88	$ 6.08	$ 9.72	$ 13.20	$ 12.42	$ 9.99
Weighted average shares outstanding:
Basic shares (in shares)	73,165	73,887	73,521	73,705	73,523	73,155	75,598	82,060
Diluted shares (in shares)	74,604	75,001	74,483	74,763	74,733	74,387	76,862	84,061