Other Comprehensive Earnings (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Foreign currency translation adjustments [Abstract]
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax									$ (69,468)	$ 103,214	$ (86,876)
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax									(9,498)	43,842	(18,827)
Total foreign currency translation adjustments									(59,970)	147,056	(105,703)
Pension and other postretirement benefit plans [Abstract]
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax									(14,379)	28,784	5,936
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax									3,241	(7,397)	(4,560)
Pension and other postretirement benefit plans									(11,138)	21,387	1,376
Changes in fair value of cash flow hedges [Abstract]
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax									3,416	(3,678)	860
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax									(717)	1,287	(301)
Changes in fair value of cash flow hedges, net of tax									2,699	(2,391)	559
Other Comprehensive Income Other Adjustment Net Of Tax [Abstract]
Other Comprehensive Income Loss Adjustment Before Tax										(1,687)	(1,119)
Other Comprehensive Income Loss Other Adjustment Tax										202	134
Other comprehensive income loss other adjustment, net of tax									0	(1,485)	(985)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]
Other Comprehensive Income (Loss), before Tax									(80,431)	126,633	(81,199)
Other Comprehensive Income (Loss), Tax									12,022	37,934	(23,554)
Other Comprehensive Income (Loss), Net of Tax									(68,409)	164,567	(104,753)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	$ (142,567)				$ (93,925)				(142,567)	(93,925)
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax	(102,932)				(100,538)				(102,932)	(100,538)
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	2,403				(296)				2,403	(296)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(243,096)				(194,759)				(243,096)	(194,759)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net earnings	$ 141,569	$ 157,305	$ 139,959	$ 131,434	$ 296,448	$ 178,912	$ 164,058	$ 172,247	570,267	811,665	508,892
Other comprehensive earnings (loss)									(68,409)	164,567	(104,753)
Comprehensive earnings									501,858	976,232	404,139
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax [Abstract]
Amortization of actuarial losses									4,893	7,735	8,544
Amortization of prior service costs and transition obligation									3,631	4,424	6,609
Settlements and Curtailments									12,565	(3,844)	0
Total before tax									21,089	8,315	15,153
Tax benefit									(4,459)	(2,503)	(5,073)
Net of tax									16,630	5,812	10,080
Other Comprehensive Income Loss Reclassification Adjustment From AOCI Derivatives Net of Tax [Abstract]
Net (gains) losses reclassified into earnings									1,950	(908)	638
Tax expense (benefit)									(409)	318	(223)
Net of tax									$ 1,541	$ (590)	$ 415