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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2020
Feb. 19, 2021
Jun. 30, 2020
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2020    
Document Transition Report false    
Entity File Number 1-4639    
Entity Registrant Name CTS CORPORATION    
Entity Incorporation, State or Country Code IN    
Entity Tax Identification Number 35-0225010    
Entity Address, Address Line One 4925 Indiana Avenue    
Entity Address, City or Town Lisle    
Entity Address, State or Province IL    
Entity Address, Postal Zip Code 60532    
City Area Code 630    
Local Phone Number 577-8800    
Title of Each Class Common stock, without par value    
Trading Symbol CTS    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer No    
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    
ICFR Auditor Attestation Flag false    
Entity Shell Company false    
Entity Public Float     $ 637,000,000
Entity Common Stock, Shares Outstanding   32,348,383  
Entity Central Index Key 0000026058    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Amendment Flag false    
Documents Incorporated by Reference

(1)

Portions of the Proxy Statement to be filed for the annual meeting of shareholders to be held on or about May 13, 2021 are incorporated by reference in Part III.