Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2021	Jan. 31, 2022	Jun. 30, 2021
Cover page.
Document Annual Report	true
Document Transition Report	false
Document Type	10-K
Document Period End Date	Dec. 31, 2021
Entity File Number	0-1402
Entity Registrant Name	LINCOLN ELECTRIC HOLDINGS INC
Entity Incorporation, State or Country Code	OH
Entity Tax Identification Number	34-1860551
Entity Address, Address Line One	22801 St. Clair Avenue
Entity Address, City or Town	Cleveland
Entity Address, State or Province	OH
Entity Address, Postal Zip Code	44117
City Area Code	216
Local Phone Number	481-8100
Title of 12(b) Security	Common Shares, without par value
Trading Symbol	LECO
Security Exchange Name	NASDAQ
Entity Central Index Key	0000059527
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Interactive Data Current	Yes
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$ 7,648,397,697
Entity Common Stock, Shares Outstanding		58,732,179
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
ICFR Auditor Attestation Flag	true
Auditor Name	Ernst & Young LLP
Auditor Firm ID	42
Auditor Location	Cleveland, Ohio
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false