Cover Page - shares	3 Months Ended
	Mar. 31, 2021	Apr. 30, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2021
Document Transition Report	false
Entity File Number	000-21918
Entity Registrant Name	FLIR SYSTEMS, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	93-0708501
Entity Address, Address Line One	27700 SW Parkway Avenue,
Entity Address, City or Town	Wilsonville,
Entity Address, State or Province	OR
Entity Address, Postal Zip Code	97070
City Area Code	503
Local Phone Number	498-3547
Title of 12(b) Security	Common Stock, $0.01 par value
Trading Symbol	FLIR
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		131,932,461
Current Fiscal Year End Date	--12-31
Entity Central Index Key	0000354908
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Amendment Flag	false