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SEGMENT INFORMATION - Financial Information of Reportable Segments (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2026 USD ($) segment	Mar. 31, 2025 USD ($)
Financial information for the reportable segments
Number of operating segments | segment	3
Net sales	$ 1,121,434	$ 1,004,388
Cost of goods sold	722,302	638,940
Capital expenditures	(39,163)	(26,949)
Depreciation and amortization	26,009	23,784
Rationalization and asset impairment net charges	2,163	3,865
Operating segments
Financial information for the reportable segments
Addback: Special items charge	(2,163)	(3,725)
Segment Adjusted EBIT	190,939	171,539
Capital expenditures	(39,163)	(26,949)
Depreciation and amortization	27,105	24,155
Inter-segment
Financial information for the reportable segments
Net sales	(47,180)	(41,188)
Aggregation before other operating segment
Financial information for the reportable segments
Net sales	1,121,434	1,004,388
Aggregation before other operating segment | Operating segments
Financial information for the reportable segments
Net sales	1,168,614	1,045,576
Aggregation before other operating segment | Inter-segment
Financial information for the reportable segments
Net sales	47,180	41,188
Americas Welding
Financial information for the reportable segments
Net sales	706,225	653,107
Rationalization and asset impairment net charges	573	2,135
Americas Welding | Operating segments
Financial information for the reportable segments
Net sales	742,934	683,479
Cost of goods sold	464,890	417,700
Other segment expenses	151,149	143,716
Addback: Special items charge	(573)	(2,135)
Segment Adjusted EBIT	127,468	124,198
Capital expenditures	(26,983)	(21,766)
Depreciation and amortization	17,774	16,114
Americas Welding | Inter-segment
Financial information for the reportable segments
Net sales	36,709	30,372
International Welding
Financial information for the reportable segments
Net sales	227,035	219,061
Rationalization and asset impairment net charges	1,772	1,552
International Welding | Operating segments
Financial information for the reportable segments
Net sales	232,842	225,893
Cost of goods sold	167,084	163,442
Other segment expenses	44,868	40,851
Addback: Special items charge	(1,772)	(1,412)
Segment Adjusted EBIT	22,662	23,012
Capital expenditures	(9,315)	(3,608)
Depreciation and amortization	6,682	5,378
International Welding | Inter-segment
Financial information for the reportable segments
Net sales	5,807	6,832
The Harris Products Group
Financial information for the reportable segments
Net sales	188,174	132,220
Rationalization and asset impairment net charges	(182)	178
The Harris Products Group | Operating segments
Financial information for the reportable segments
Net sales	192,838	136,204
Cost of goods sold	137,600	97,974
Other segment expenses	14,247	14,079
Addback: Special items charge	182	(178)
Segment Adjusted EBIT	40,809	24,329
Capital expenditures	(2,865)	(1,575)
Depreciation and amortization	2,649	2,663
The Harris Products Group | Inter-segment
Financial information for the reportable segments
Net sales	$ 4,664	$ 3,984

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