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SEGMENT INFORMATION (Financial Information of Reportable Segments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Financial information for the reportable segments
Net sales (Note 2)	$ 826,454	$ 590,727	$ 1,583,475	$ 1,292,718
Revenue from Related Parties	0	0	0	0
Segment, including Inter-segment, sales	826,454	590,727	1,583,475	1,292,718
Adjusted EBIT	128,455	66,133	241,129	154,843
Special items charge (Gain)	4,931	26,572	15,093	33,899
EBIT	123,524	39,561	226,036	120,944
Interest income	398	424	852	1,284
Interest expense	(6,061)	(6,305)	(11,874)	(12,623)
Income before income taxes	117,861	33,680	215,014	109,605
Rationalization and asset impairment charges (gains)	630	23,238	4,793	29,759
Corporate/Eliminations
Financial information for the reportable segments
Net sales (Note 2)	0	0	0	0
Revenue from Related Parties	(48,946)	(33,532)	(88,126)	(64,523)
Segment, including Inter-segment, sales	(48,946)	(33,532)	(88,126)	(64,523)
Adjusted EBIT	(3,888)	(1,964)	(5,344)	(3,063)
Special items charge (Gain)	810		1,923
EBIT	(4,698)	(1,964)	(7,267)	(3,063)
Acquisition Transaction and Integration Costs	810		1,923
Acquisition Transaction and Integration Costs	810		1,923
Americas Welding [Member]
Financial information for the reportable segments
Rationalization and asset impairment charges (gains)		22,673		23,863
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment	1,650	3,334	6,536	3,334
Americas Welding [Member] | Operating Segments
Financial information for the reportable segments
Net sales (Note 2)	457,468	333,229	882,710	751,764
Revenue from Related Parties	39,765	27,493	72,513	52,276
Segment, including Inter-segment, sales	497,233	360,722	955,223	804,040
Adjusted EBIT	84,134	46,702	160,751	117,404
Special items charge (Gain)	1,650	26,007	6,090	27,197
EBIT	82,484	20,695	154,661	90,207
International Welding [Member]
Financial information for the reportable segments
Rationalization and asset impairment charges (gains)	630	565	4,793	5,896
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment			446
Business Combination, Inventory Step Up	1,841		1,841	806
International Welding [Member] | Operating Segments
Financial information for the reportable segments
Net sales (Note 2)	252,352	177,167	475,431	375,090
Revenue from Related Parties	6,897	4,286	11,182	8,769
Segment, including Inter-segment, sales	259,249	181,453	486,613	383,859
Adjusted EBIT	29,997	9,682	48,813	16,297
Special items charge (Gain)	2,471	565	7,080	6,702
EBIT	27,526	9,117	41,733	9,595
The Harris Products Group | Operating Segments
Financial information for the reportable segments
Net sales (Note 2)	116,634	80,331	225,334	165,864
Revenue from Related Parties	2,284	1,753	4,431	3,478
Segment, including Inter-segment, sales	118,918	82,084	229,765	169,342
Adjusted EBIT	18,212	11,713	36,909	24,205
EBIT	$ 18,212	$ 11,713	$ 36,909	$ 24,205

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