UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' INVESTMENT - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023		Sep. 30, 2022
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	$ 2,195,949,326	$ 1,986,574,480	$ 2,065,792,821	[1]	$ 1,937,988,467
Issuance of common stock from stock plan transactions	10,422,050	3,369,936	$ 24,304,861		12,365,103
Issuance of common stock related to acquisitions					5,000,012
Repurchases of common stock (in shares)			(2,700,000)
Repurchases of common stock	(25,169,378)	(22,256,782)	$ (78,735,501)		(93,508,804)
Stock-based compensation expense related to stock options, employee stock purchases and restricted stock	10,948,031	7,611,546	29,212,236		22,973,113
Dividends declared	(27,991,662)	(28,151,347)	(84,049,880)		(84,719,963)
Net income	104,725,412	72,655,995	311,459,076		232,589,023
Other comprehensive income (loss)	(429,972)	14,241,836	470,194		1,358,713
Ending Balance	$ 2,268,453,807	$ 2,034,045,664	$ 2,268,453,807		$ 2,034,045,664
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	233,429,994	235,132,265	234,169,335		236,440,840
Beginning Balance	$ 14,005,799	$ 14,107,936	$ 14,050,160		$ 14,186,450
Issuance of common stock from stock plan transactions (in shares)	605,637	315,433	1,833,596		1,284,615
Issuance of common stock from stock plan transactions	$ 36,338	$ 18,926	$ 110,016		$ 77,077
Issuance of common stock related to acquisitions (in shares)					162,433
Issuance of common stock related to acquisitions					$ 9,746
Repurchases of common stock (in shares)	(776,488)	(850,306)	(2,743,788)		(3,290,496)
Repurchases of common stock	$ (46,589)	$ (51,019)	$ (164,628)		$ (197,430)
Ending balance (in shares)	233,259,143	234,597,392	233,259,143		234,597,392
Ending Balance	$ 13,995,548	$ 14,075,843	$ 13,995,548		$ 14,075,843
Additional  Paid-In Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	942,660,764	900,576,404	917,499,323		879,413,385
Issuance of common stock from stock plan transactions	10,385,712	3,351,010	24,194,845		12,288,026
Issuance of common stock related to acquisitions					4,990,266
Repurchases of common stock	(2,795,358)	(2,916,551)	(9,707,255)		(11,042,381)
Stock-based compensation expense related to stock options, employee stock purchases and restricted stock	10,948,031	7,611,546	29,212,236		22,973,113
Ending Balance	961,199,149	908,622,409	961,199,149		908,622,409
Retained  Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	1,252,525,531	1,082,846,019	1,148,386,272		1,042,461,388
Repurchases of common stock	(22,327,431)	(19,289,212)	(68,863,618)		(82,268,993)
Dividends declared	(27,991,662)	(28,151,347)	(84,049,880)		(84,719,963)
Net income	104,725,412	72,655,995	311,459,076		232,589,023
Ending Balance	1,306,931,850	1,108,061,455	1,306,931,850		1,108,061,455
Accumulated  Other Comprehensive Income (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(13,242,768)	(10,955,879)	(14,142,934)		1,927,244
Other comprehensive income (loss)	(429,972)	14,241,836	470,194		1,358,713
Ending Balance	$ (13,672,740)	$ 3,285,957	$ (13,672,740)		$ 3,285,957

[1] The condensed consolidated balance sheet at December 31, 2022 has been derived from the audited consolidated financial statements at that date, but does not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements.