Condensed Consolidated Statements of Stockholders' Investment - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 1,670,730	$ 1,595,087
Net income	78,146	161,788
Foreign currency adjustments, net of tax	(32,195)	5,297
Dividends declared	(69,871)	(69,683)
Stock issued for employee benefit plans	(2,526)	7,573
Issuance of restricted stock, net of forfeitures	0	0
Stock-based compensation expense	11,397	17,123
Repurchase of common stock	(68,563)	(64,624)
Ending balance	$ 1,587,118	$ 1,652,561
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	134,895	137,284
Beginning balance	$ 13,490	$ 13,728
Stock issued for employee benefit plans (in shares)	343	342
Stock issued for employee benefit plans	$ 34	$ 34
Issuance of restricted stock, net of forfeitures (in shares)	321
Issuance of restricted stock, net of forfeitures (in shares)		(3)
Issuance of restricted stock, net of forfeitures	$ 32	$ 0
Stock-based compensation expense (in shares)	0	0
Stock-based compensation expense	$ 0	$ 0
Repurchase of common stock (in shares)	(973)	(734)
Repurchase of common stock	$ (97)	$ (73)
Ending balance (in shares)	134,586	136,889
Ending balance	$ 13,459	$ 13,689
Additional Paid-in Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	546,646	521,486
Stock issued for employee benefit plans	(24,192)	(11,520)
Issuance of restricted stock, net of forfeitures	(32)	0
Stock-based compensation expense	11,397	17,123
Ending balance	533,819	527,089
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	4,144,834	3,845,593
Net income	78,146	161,788
Dividends declared	(69,871)	(69,683)
Ending balance	4,153,109	3,937,698
Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(76,149)	(71,935)
Foreign currency adjustments, net of tax	(32,195)	5,297
Ending balance	(108,344)	(66,638)
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(2,958,091)	(2,713,785)
Stock issued for employee benefit plans	21,632	19,059
Stock-based compensation expense	0	0
Repurchase of common stock	(68,466)	(64,551)
Ending balance	$ (3,004,925)	$ (2,759,277)