v3.26.1
Document and Entity Information
 12 Months Ended
Dec. 31, 2025
shares
Entity Addresses [Line Items]  
Document Type 20-F
Document Registration Statement false
Document Annual Report true
Document Period End Date Dec. 31, 2025
Document Transition Report false
Document Shell Company Report false
Entity File Number 001-37384
Entity Registrant Name GALAPAGOS NV
Entity Incorporation, State or Country Code C9
Entity Address, Address Line One Generaal De Wittelaan L11 A3
Entity Address, City or Town Mechelen
Entity Address, Country BE
Entity Address, Postal Zip Code 2800
Title of 12(b) Security American Depositary Shares, each representing one
Security Exchange Name NASDAQ
Trading Symbol GLPG
Entity Common Stock, Shares Outstanding 65,897,071
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 Emerging Growth Company false
ICFR Auditor Attestation Flag true
Document Accounting Standard International Financial Reporting Standards
Entity Shell Company false
Entity Central Index Key 0001421876
Current Fiscal Year End Date --12-31
Document Fiscal Year Focus 2025
Document Fiscal Period Focus FY
Auditor Name BDO Bedrijfsrevisoren BV
Auditor Firm ID 1432
Auditor Location Zaventem, Belgium
Amendment Flag false
Document Financial Statement Error Correction [Flag] false
Business Contact [Member]  
Entity Addresses [Line Items]  
Entity Address, Address Line One Generaal De Wittelaan L11 A3
Entity Address, City or Town Mechelen
Entity Address, Country BE
Entity Address, Postal Zip Code 2800
Contact Personnel Fax Number 32 15 342 901
Contact Personnel Name Henry Gosebruch