CONDENSED CONSOLIDATED STATEMENT OF COMPREHENSIVE EARNINGS (unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net earnings	$ 206,006	$ 157,305	$ 509,796	$ 428,698
Foreign currency translation adjustments [Abstract]
Foreign currency translation (losses) gains	(50,865)	(13,567)	(41,143)	(26,418)
Reclassification of foreign currency translation losses to earnings	0	0	25,339	0
Total foreign currency translation adjustment	(50,865)	(13,567)	(15,804)	(26,418)
Pension and other postretirement benefit plans [Abstract]
Amortization of actuarial losses included in net periodic pension cost	127	402	379	3,409
Amortization of prior service cost included in net periodic pension cost	539	704	1,623	2,699
Total pension and other postretirement benefit plans	666	1,106	2,002	6,108
Changes in fair value of cash flow hedges [Abstract]
Unrealized net gains (losses) arising during period	545	(1,449)	(223)	2,019
Net losses (gains) reclassified into earnings	577	364	(69)	(347)
Total cash flow hedges	1,122	(1,085)	(292)	1,672
Other comprehensive (loss) earnings	(49,077)	(13,546)	(14,094)	(18,638)
Comprehensive earnings	$ 156,929	$ 143,759	$ 495,702	$ 410,060