Employment, Post-Employment Benefits and Share Compensation Plans - Actuarial interest rate (Details) - France - EUR (€) € in Thousands	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024
Employment, Post-Employment Benefits and Share Compensation Plans
Increase in assumption	0.50%	0.50%
Decrease in assumption	(0.50%)	(0.50%)
Weighted average duration of the pension plan	9 years 6 months	9 years 8 months 12 days
Average duration of the long service awards	10 years 10 months 24 days	11 years 2 months 12 days
Expected service costs for next year	€ 1,055
Discount rate
Employment, Post-Employment Benefits and Share Compensation Plans
Change of relating pension provision due to increase in assumption	(531)	€ (559)
Change of relating pension provision due to decrease in assumption	572	605
Salary increase
Employment, Post-Employment Benefits and Share Compensation Plans
Change of relating pension provision due to increase in assumption	576	546
Change of relating pension provision due to decrease in assumption	€ (539)	€ (510)

The average duration of long service awards.

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- Definition

Amount of expected service cost.

+ References

No definition available.

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- 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.

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- Definition

The increase (decrease) in a defined benefit obligation that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [domain]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [domain]]

+ References

+ Details

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- Definition

The reasonably possible percentage of the decrease in the actuarial assumption used to determine the present value of defined benefit obligation. [Refer: Actuarial assumptions [domain]]

+ References

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- Definition

The reasonably possible percentage of the increase in the actuarial assumption used to determine the present value of defined benefit obligation. [Refer: Actuarial assumptions [domain]]

+ References

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- Definition

The weighted average duration of a defined benefit obligation. [Refer: Weighted average [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Number 19
-IssueDate 2025-01-01
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