Cover Page - shares	6 Months Ended
	Jun. 30, 2022	Jul. 22, 2022
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2022
Document Transition Report	false
Entity File Number	1-10235
Entity Registrant Name	IDEX CORP
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	36-3555336
Entity Address, Address Line One	3100 Sanders Road,
Entity Address, Address Line Two	Suite 301,
Entity Address, City or Town	Northbrook,
Entity Address, State or Province	IL
Entity Address, Postal Zip Code	60062
City Area Code	847
Local Phone Number	498-7070
Title of 12(b) Security	Common Stock, par value $.01 per share
Trading Symbol	IEX
Security Exchange Name	NYSE
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		75,475,605
Entity Central Index Key	0000832101
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q2
Amendment Flag	false