CONDENSED CONSOLIDATED STATEMENT OF COMPREHENSIVE EARNINGS (unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net earnings	$ 263,756	$ 200,300	$ 761,033	$ 501,345
Foreign currency translation adjustments [Abstract]
Foreign currency translation (losses) gains	(26,155)	29,271	(17,567)	(19,714)
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	5,446	(9,872)	11,669	(12,761)
Total foreign currency translation adjustment	(26,155)	29,271	(17,567)	(19,714)
Pension and other postretirement benefit plans [Abstract]
Amortization of actuarial losses included in net periodic pension cost	2,353	1,881	7,080	5,385
Amortization of prior service cost included in net periodic pension cost	214	250	646	794
Pension and other postretirement benefit plans, tax	(771)	(421)	(2,320)	(1,408)
Total pension and other postretirement benefit plans	2,567	2,131	7,726	6,179
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax	(212)	(278)	4,107	(3,472)
Changes in fair value of cash flow hedges [Abstract]
Net losses (gains) reclassified into earnings	(206)	(210)	(3,077)	318
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax	(122)	(139)	302	(896)
Total cash flow hedges	(418)	(488)	1,030	(3,154)
Other comprehensive (loss) earnings	(24,006)	30,914	(8,811)	(16,689)
Comprehensive earnings	$ 239,750	$ 231,214	$ 752,222	$ 484,656