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Cover - USD ($)
 12 Months Ended
Dec. 31, 2020
Feb. 24, 2021
Jun. 30, 2020
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2020    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 0-25965    
Entity Registrant Name J2 GLOBAL, INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 47-1053457    
Entity Address, Address Line One 700 S. Flower Street    
Entity Address, Address Line Two 15th Floor    
Entity Address, City or Town Los Angeles    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 90017    
City Area Code 323    
Local Phone Number 860-9200    
Title of 12(b) Security Common Stock, $0.01 par value    
Trading Symbol JCOM    
Security Exchange Name NASDAQ    
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    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 2,056,955,800
Entity Common Stock, Shares Outstanding   45,170,544  
Documents Incorporated by Reference
Portions of the definitive Proxy Statement to be delivered to stockholders in connection with the Annual Meeting of Stockholders to be held May 7, 2021 are incorporated by reference into Part III of this Form 10-K.
 
This Annual Report on Form 10-K includes 138 pages with the Index to Exhibits located on page 133.
    
Entity Central Index Key 0001084048    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Amendment Flag false