CONDENSED CONSOLIDATED STATEMENT OF COMPREHENSIVE EARNINGS (unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net earnings	$ 200,300	$ 206,006	$ 501,345	$ 509,796
Foreign currency translation adjustments [Abstract]
Foreign currency translation (losses) gains	29,271	(50,865)	(19,714)	(41,143)
Reclassification of foreign currency translation losses to earnings	0	0	0	25,339
Total foreign currency translation adjustment	29,271	(50,865)	(19,714)	(15,804)
Pension and other postretirement benefit plans [Abstract]
Amortization of actuarial losses included in net periodic pension cost	1,881	127	5,385	379
Amortization of prior service cost included in net periodic pension cost	250	539	794	1,623
Total pension and other postretirement benefit plans	2,131	666	6,179	2,002
Changes in fair value of cash flow hedges [Abstract]
Unrealized net gains (losses) arising during period	(278)	545	(3,472)	(223)
Net losses (gains) reclassified into earnings	(210)	577	318	(69)
Total cash flow hedges	(488)	1,122	(3,154)	(292)
Other comprehensive (loss) earnings	30,914	(49,077)	(16,689)	(14,094)
Comprehensive earnings	$ 231,214	$ 156,929	$ 484,656	$ 495,702