Other Comprehensive Earnings (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Foreign currency translation adjustments [Abstract]
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax									$ 25,028,000	$ (69,468,000)	$ 103,214,000
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax									(4,714,000)	(9,498,000)	43,842,000
Total foreign currency translation adjustments									20,314,000	(59,970,000)	147,056,000
Pension and other postretirement benefit plans [Abstract]
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax									6,592,000	(14,379,000)	28,784,000
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax									(1,184,000)	3,241,000	(7,397,000)
Pension and other postretirement benefit plans									5,408,000	(11,138,000)	21,387,000
Changes in fair value of cash flow hedges [Abstract]
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax									1,707,000	3,416,000	(3,678,000)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax									(359,000)	(717,000)	1,287,000
Changes in fair value of cash flow hedges, net of tax									1,348,000	2,699,000	(2,391,000)
Other Comprehensive Income Other Adjustment Net Of Tax [Abstract]
Other Comprehensive Income Loss Adjustment Before Tax											(1,687,000)
Other Comprehensive Income Loss Other Adjustment Tax											202,000
Other comprehensive income loss other adjustment, net of tax									0	0	(1,485,000)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]
Other Comprehensive Income (Loss), before Tax									33,327,000	(80,431,000)	126,633,000
Other Comprehensive Income (Loss), Tax									(6,257,000)	12,022,000	37,934,000
Other Comprehensive Income (Loss), Net of Tax									27,070,000	(68,409,000)	164,567,000
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	$ (122,252,000)				$ (142,567,000)				(122,252,000)	(142,567,000)
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax	(97,525,000)				(102,932,000)				(97,525,000)	(102,932,000)
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	3,751,000				2,403,000				3,751,000	2,403,000
Accumulated Other Comprehensive Income (Loss), Net of Tax	(216,026,000)				(243,096,000)				(216,026,000)	(243,096,000)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net earnings	$ 168,122,000	$ 206,006,000	$ 198,085,000	$ 105,705,000	$ 141,569,000	$ 157,305,000	$ 139,959,000	$ 131,434,000	677,918,000	570,267,000	811,665,000
Other comprehensive earnings (loss)									27,070,000	(68,409,000)	164,567,000
Comprehensive earnings									704,988,000	501,858,000	976,232,000
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax [Abstract]
Amortization of actuarial losses									759,000	4,893,000	7,735,000
Amortization of prior service costs and transition obligation									2,729,000	3,631,000	4,424,000
Settlements and Curtailments									961,000	12,565,000	(3,844,000)
Total before tax									4,449,000	21,089,000	8,315,000
Tax benefit									(906,000)	(4,459,000)	(2,503,000)
Net of tax									3,543,000	16,630,000	5,812,000
Other Comprehensive Income Loss Reclassification Adjustment From AOCI Derivatives Net of Tax [Abstract]
Net (gains) losses reclassified into earnings									(186,000)	1,950,000	(908,000)
Tax expense (benefit)									39,000	(409,000)	318,000
Net of tax									(147,000)	1,541,000	(590,000)
Reclassification of foreign currency translation losses (gains) to earnings									25,339,000	0	3,992,000
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, before Tax									(25,339,000)	0	(3,992,000)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Tax									$ 0	$ 0	$ 0