v3.25.1

Trade and other liabilities and other non-current liabilities - Narrative (Details) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2024 EUR (€) Y | Dec. 31, 2023 | Dec. 31, 2022 | Jun. 21, 2022 EUR (€)
Discount rate | Contingent consideration liabilities [member] |  |  |  |
Business combinations during the period |  |  |  |
Percentage of reasonably possible increase in unobservable input, liabilities | 1.00% |  |  |
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, liabilities | € (600,000) |  |  |
Time Frame [member] | Contingent consideration liabilities [member] |  |  |  |
Business combinations during the period |  |  |  |
Key assumptions in valuation of contingent consideration liability. | Y | 1 |  |  |
Increase (decrease) in fair value measurement due to reasonably possible decrease in unobservable input, liabilities | € (2,500,000) |  |  |
Cell Point Acquisition |  |  |  |
Business combinations during the period |  |  |  |
Fair value of contingent consideration |  |  |  | € 20,211,000
Contingent consideration on certain development milestone |  |  |  | 20,000,000
Contingent consideration on regulatory milestone |  |  |  | 30,000,000
Contingent consideration on sales based milestone |  |  |  | 50,000,000
Cell Point Acquisition | Discount rate |  |  |  |
Business combinations during the period |  |  |  |
Key assumptions in valuation of contingent consideration liability. | 13.75 | 13.72 | 12.5 |
Cell Point Acquisition | Probabilities Of Success [member] |  |  |  |
Business combinations during the period |  |  |  |
Percentage of reasonably possible increase in unobservable input, liabilities | 5.00% |  |  |
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, liabilities | € 2,900,000 |  |  |
Cell Point Acquisition | Maximum |  |  |  |
Business combinations during the period |  |  |  |
Additional contingent consideration |  |  |  | € 100,000,000

X
- Definition The additional amount, at acquisition date, of contingent consideration arrangements recognised as consideration transferred in a business combination. + References No definition available. + Details
Name: | glpg_AdditionalContingentConsiderationRecognisedAsOfAcquisitionDate
Namespace Prefix: | glpg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of contingent consideration payable on achievement of certain development milestones. + References No definition available. + Details
Name: | glpg_ContingentConsiderationPayableOnAchievementOfCertainDevelopmentMilestones
Namespace Prefix: | glpg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of contingent consideration payable on achievement of regulatory milestones. + References No definition available. + Details
Name: | glpg_ContingentConsiderationPayableOnAchievementOfRegulatoryMilestones
Namespace Prefix: | glpg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of contingent consideration payable on achievement of sales based milestones. + References No definition available. + Details
Name: | glpg_ContingentConsiderationPayableOnAchievementOfSalesBasedMilestones
Namespace Prefix: | glpg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount, at acquisition date, of contingent consideration arrangements recognised as consideration transferred in a business combination. [Refer: Total for all business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2024-01-01 -Paragraph B64 -Subparagraph g -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2024-en-r&anchor=para_B64_g_i&doctype=Appendix&subtype=B -URIDate 2024-03-27 + Details
Name: | ifrs-full_ContingentConsiderationRecognisedAsOfAcquisitionDate
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfBusinessCombinationsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of increase (decrease) in the fair value measurement of liabilities due to a reasonably possible decrease in an unobservable input. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2024-01-01 -Paragraph 93 -Subparagraph h -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2024-en-r&anchor=para_93_h_ii&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_IncreaseDecreaseInFairValueMeasurementDueToReasonablyPossibleDecreaseInUnobservableInputLiabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of increase (decrease) in the fair value measurement of liabilities due to a reasonably possible increase in an unobservable input. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2024-01-01 -Paragraph 93 -Subparagraph h -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2024-en-r&anchor=para_93_h_ii&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_IncreaseDecreaseInFairValueMeasurementDueToReasonablyPossibleIncreaseInUnobservableInputLiabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The percentage of a reasonably possible increase in an unobservable input used in fair value measurement of liabilities. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 13 -IssueDate 2024-01-01 -Paragraph 93 -Subparagraph h -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2024-en-r&anchor=para_93_h_ii&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_PercentageOfReasonablyPossibleIncreaseInUnobservableInputLiabilities
Namespace Prefix: | ifrs-full_
Data Type: | dtr-2022:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The value of significant unobservable input used in the measurement of the fair value of liabilities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2024-01-01 -Paragraph 93 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2024-en-r&anchor=para_93_d&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_SignificantUnobservableInputLiabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | ifrs-full_UnobservableInputsAxis=ifrs-full_DiscountRateMeasurementInputMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfLiabilitiesAxis=glpg_ContingentConsiderationLiabilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_UnobservableInputsAxis=glpg_TimeFrameMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_BusinessCombinationsAxis=glpg_CellPointAcquisitionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_UnobservableInputsAxis=glpg_ProbabilitiesOfSuccessMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |