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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2019
Feb. 18, 2020
Jun. 28, 2019
Cover page.      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2019    
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 1925 West Field Court,    
Entity Address, Address Line Two Suite 200,    
Entity Address, City or Town Lake Forest,    
Entity Address, State or Province IL    
Entity Address, Postal Zip Code 60045    
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 Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
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 Public Float     $ 12,993,666,859
Entity Common Stock, Shares Outstanding   76,205,390  
Documents Incorporated by Reference
Portions of the proxy statement with respect to the IDEX Corporation 2020 annual meeting of stockholders (the “2020 Proxy Statement”) are incorporated by reference into Part III of this Form 10-K.
 

    
Amendment Flag false    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Entity Central Index Key 0000832101    
Current Fiscal Year End Date --12-31