CONDENSED CONSOLIDATED STATEMENT OF COMPREHENSIVE EARNINGS (unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net earnings	$ 124,766	$ 198,085	$ 301,045	$ 303,790
Foreign currency translation adjustments [Abstract]
Foreign currency translation (losses) gains	44,569	(13,978)	(48,985)	9,722
Reclassification of foreign currency translation losses to earnings	0	0	0	25,339
Total foreign currency translation adjustment	44,569	(13,978)	(48,985)	35,061
Pension and other postretirement benefit plans [Abstract]
Amortization of actuarial losses included in net periodic pension cost	1,835	77	3,504	252
Amortization of prior service cost included in net periodic pension cost	259	512	544	1,084
Total pension and other postretirement benefit plans	2,094	589	4,048	1,336
Changes in fair value of cash flow hedges [Abstract]
Unrealized net gains (losses) arising during period	1,880	(3,362)	(3,194)	(768)
Net losses (gains) reclassified into earnings	(594)	(416)	528	(646)
Total cash flow hedges	1,286	(3,778)	(2,666)	(1,414)
Other comprehensive (loss) earnings	47,949	(17,167)	(47,603)	34,983
Comprehensive earnings	$ 172,715	$ 180,918	$ 253,442	$ 338,773