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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2019
Feb. 14, 2020
Cover page.    
Document Type 10-K  
Document Annual Report true  
Document Transition Report false  
Entity File Number 001-35167  
Entity Registrant Name Kosmos Energy Ltd.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 98-0686001  
Entity Address, Address Line One 8176 Park Lane  
Entity Address, City or Town Dallas,  
Entity Address, State or Province TX  
Entity Address, Postal Zip Code 75231  
City Area Code 214  
Local Phone Number 445 9600  
Title of 12(b) Security Common Stock $0.01 par value  
Trading Symbol KOS  
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 $ 2,220,129,484  
Entity Common Stock, Shares Outstanding   405,098,215
Documents Incorporated by Reference
Part III, Items 10‑14, is incorporated by reference from the Proxy Statement for the Annual Meeting of Shareholders which will be filed with the Securities and Exchange Commission not later than 120 days subsequent to December 31, 2019.
Certain exhibits previously filed with the Securities and Exchange Commission are incorporated by reference into Part IV of this report.
  
Entity Central Index Key 0001509991  
Document Period End Date Dec. 31, 2019  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus FY