Condensed Consolidated Statements of Stockholders' Investment - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 2,021,934	$ 1,879,933
Net income	270,348	173,305
Foreign currency adjustments	6,870	(7,286)
Dividends declared	(72,542)	(69,606)
Stock issued for employee benefit plans	8,904	(3,003)
Issuance of restricted stock, net of forfeitures		0
Stock-based compensation expense	24,606	23,989
Repurchase of common stock	(164,618)	(129,145)
Ending balance	$ 2,095,502	$ 1,868,187
Dividends declared, per share (in dollars per share)	$ 0.55	$ 0.51
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	129,186	134,298
Beginning balance	$ 12,919	$ 13,430
Stock issued for employee benefit plans (in shares)	418	357
Stock issued for employee benefit plans	$ 42	$ 36
Issuance of restricted stock, net of forfeitures (in shares)		(26)
Issuance of restricted stock, net of forfeitures		$ (3)
Stock-based compensation expense (in shares)	0	0
Stock-based compensation expense	$ 0	$ 0
Repurchase of common stock (in shares)	(1,593)	(1,386)
Repurchase of common stock	$ (160)	$ (139)
Ending balance (in shares)	128,011	133,243
Ending balance	$ 12,801	$ 13,324
Additional Paid-in Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	673,628	566,022
Stock issued for employee benefit plans	(17,377)	(21,805)
Issuance of restricted stock, net of forfeitures		3
Stock-based compensation expense	24,606	23,989
Ending balance	680,857	568,209
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	4,936,861	4,372,833
Net income	270,348	173,305
Dividends declared	(72,542)	(69,606)
Ending balance	5,134,667	4,476,532
Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(61,134)	(45,998)
Foreign currency adjustments	6,870	(7,286)
Ending balance	(54,264)	(53,284)
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(3,540,340)	(3,026,354)
Stock issued for employee benefit plans	26,239	18,766
Stock-based compensation expense	0	0
Repurchase of common stock	(164,458)	(129,006)
Ending balance	$ (3,678,559)	$ (3,136,594)