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Document And Entity Information - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2023
Feb. 21, 2024
Jun. 30, 2023
Document And Entity Information [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Document Transition Report false    
Entity File Number 001-32936    
Entity Registrant Name HELIX ENERGY SOLUTIONS GROUP, INC.    
Entity Incorporation, State or Country Code MN    
Entity Tax Identification Number 95-3409686    
Entity Address, Address Line One 3505 West Sam Houston Parkway North    
Entity Address, Address Line Two Suite 400    
Entity Address, City or Town Houston    
Entity Address, State or Province TX    
Entity Address, Postal Zip Code 77043    
City Area Code 281    
Local Phone Number 618-0400    
Title of 12(b) Security Common Stock, no par value    
Trading Symbol HLX    
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    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 1.0
Entity Common Stock, Shares Outstanding   152,416,382  
Auditor Name KPMG LLP    
Auditor Firm ID 185    
Auditor Location Houston, Texas    
Entity Central Index Key 0000866829    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Amendment Flag false    
Documents Incorporated by Reference [Text Block]

Portions of the definitive Proxy Statement for the Annual Meeting of Shareholders to be held on May 15, 2024 are incorporated by reference into Part III hereof.