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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2019
Feb. 05, 2020
Jun. 30, 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 001-12561    
Entity Registrant Name BELDEN INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 36-3601505    
Entity Address, Address Line One 1 North Brentwood Boulevard    
Entity Address, Address Line Two 15th Floor    
Entity Address, City or Town St. Louis    
Entity Address, State or Province MO    
Entity Address, Postal Zip Code 63105    
City Area Code 314    
Local Phone Number 854-8000    
Title of 12(b) Security Common Stock, $0.01 par value per share    
Trading Symbol BDC    
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 File Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging growth company false    
Entity Shell Company false    
Entity Public Float     $ 1,719,404,831
Entity Common Stock, Shares Outstanding   45,459,726  
Amendment Flag false    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Entity Central Index Key 0000913142    
Current Fiscal Year End Date --12-31    
Documents Incorporated by Reference
The registrant intends to file a definitive proxy statement for its annual meeting of stockholders within 120 days of the end of the fiscal year ended December 31, 2019 (the “Proxy Statement”). Portions of such proxy statement are incorporated by reference into Part III.