Statement of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net earnings	$ 602,739	$ 561,109	$ 512,611
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment	29,914	2,898	(32,573)
Unrealized gains (losses) on cash flow hedging arrangements:
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	(11,323)	(1,063)	(658)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	11,066	(861)	2,441
Net actuarial gains (losses)	(35,662)	(32,699)	(23,326)
Plan amendments and prior service cost	(93)	430	(780)
Amortization of actuarial (gains) losses and plan amendments and prior service cost	14,547	12,144	14,366
Defined Benefit Plans, Impact of FX on Current Year Change in OCI, net of tax	(19,701)	(2,108)	3,522
Total other comprehensive income (loss), net of tax	(11,252)	(21,259)	(37,008)
Total other comprehensive income (loss), net of tax	$ 591,487	$ 539,850	$ 475,603