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Retirement benefit obligations (Tables) | 12 Months Ended
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Dec. 31, 2025
Disclosure of defined benefit plans [abstract] |
Disclosure of main actuarial assumptions used to measure the retirement benefit obligations | The main actuarial assumptions used to measure the retirement benefit obligations are as follows:
ACTUARIAL ASSUMPTIONS | YEAR ENDED DECEMBER 31, 2023 |  | YEAR ENDED DECEMBER 31, 2024 |  | YEAR ENDED DECEMBER 31, 2025
Retirement age | 65 years for key management / 63 years for other employees |  | 65 years for key management / 64 years for other employees |  | 65 years for key management / 64 years for other employees
Collective agreement | Pharmaceutical industry |  | Pharmaceutical industry |  | Pharmaceutical industry
Discount Rate (IBoxx Corporates AA) | 0.90% |  | 3.34% |  | 3.70%
Mortality rate table | INSEE 2016-2018 |  | INSEE 2016-2018 |  | INSEE 2016-2018
Salary increase rate | 3% for key management / 2.55% for other employees |  | 3% for key management / 2.55% for other employees |  | 3.00%
Turnover rate | Decreasing from 5.80% at 20 years-old to 0.05% from 55 years-old |  | Decreasing rates by age and zero from age 55, generating an average exit rate for 2025 of 2.05% |  | Decreasing rates by age and zero from age 55, generating an average exit rate for 2025 of 2.02%.
Employee contribution rate | 45% |  | 45% |  | 45%
Disclosure of changes in projected benefit obligation | Changes in the projected benefit obligation for the periods presented were as follows:
(In thousands of euros) | RETIREMENT BENEFIT OBLIGATIONS
AS OF JANUARY 1, 2023 | 610
Service cost | 109
Interest cost | 23
Actuarial gains and losses | (112)
AS OF DECEMBER 31, 2023 | 629
Service cost | 115
Interest cost | 22
Benefits paid | (41)
Actuarial gains and losses | 31
AS OF DECEMBER 31, 2024 | 756
Current service cost | 141
Past services cost | (205)
Interest cost | 29
Actuarial gains and losses | (93)
AS OF DECEMBER 31, 2025 | 627

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- Definition The disclosure of defined benefit plans. [Refer: Defined benefit plans [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2025-01-01 -Paragraph 138 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_138&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 204 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_204&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 204 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_204&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The disclosure of a net defined benefit liability (asset). [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2025-01-01 -Paragraph 140 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_140_a&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 206 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_206_a&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 206 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_206_a&doctype=Standard -URIDate 2025-03-27 + Details
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