CONSOLIDATED STATEMENTS OF EQUITY - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Capital In Excess Of Par Value [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Beginning balance, shares at Dec. 31, 2015	133,172
Balance at beginning of period at Dec. 31, 2015	$ 133,172	$ 2,822,578	$ 1,618,507	$ (120,069)	$ 4,454,188
Net earnings	$ 0	0	419,491	0	419,491
Share-based compensation plans, net of shares withheld for taxes, shares	594
Share-based compensation plans, net of shares withheld for taxes	$ 594	(35,363)	0	0	(34,769)
Purchase and retirement of common stock, shares	(1,427)
Purchase and retirement of common stock	$ (1,427)	0	(160,036)	0	(161,463)
Share-based compensation expense	0	20,670	0	0	20,670
Cash dividends on common stock	0	0	(106,333)	0	(106,333)
Other comprehensive income (loss)	0	0	0	(19,307)	(19,307)
Other	$ 0	110	(111)	0	(1)
Ending balance, shares at Dec. 31, 2016	132,339
Balance at end of period at Dec. 31, 2016	$ 132,339	2,807,995	1,771,518	(139,376)	4,572,476
Net earnings	$ 0	0	601,185	0	601,185
Share-based compensation plans, net of shares withheld for taxes, shares	495
Share-based compensation plans, net of shares withheld for taxes	$ 495	(29,168)	0	0	(28,673)
Purchase and retirement of common stock, shares	(510)
Purchase and retirement of common stock	$ (510)	0	(59,793)	0	(60,303)
Share-based compensation expense	0	26,635	0	0	26,635
Cash dividends on common stock	0	0	(132,335)	0	(132,335)
Other comprehensive income (loss)	0	0	0	(10,090)	(10,090)
Other	$ 0	125	(127)	0	(2)
Ending balance, shares at Dec. 31, 2017	132,324
Balance at end of period at Dec. 31, 2017	$ 132,324	2,805,587	2,180,448	(149,466)	4,968,893
Released stranded tax effects ASU 2018-02 (Note 9)	0	0	29,629	(29,629)	0
Balances at January 1, 2018, due to reclassification	132,324	2,805,587	2,210,077	(179,095)	4,968,893
Net earnings	$ 0	0	515,805	0	515,805
Share-based compensation plans, net of shares withheld for taxes, shares	630
Share-based compensation plans, net of shares withheld for taxes	$ 630	(32,428)	0	0	(31,798)
Purchase and retirement of common stock, shares	(1,192)
Purchase and retirement of common stock	$ (1,192)	0	(132,791)	0	(133,983)
Share-based compensation expense	0	25,215	0	0	25,215
Cash dividends on common stock	0	0	(148,109)	0	(148,109)
Other comprehensive income (loss)	0	0	0	6,880	6,880
Other	$ 0	112	(112)	0	0
Ending balance, shares at Dec. 31, 2018	131,762
Balance at end of period at Dec. 31, 2018	$ 131,762	$ 2,798,486	$ 2,444,870	$ (172,215)	$ 5,202,903