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Financial risk management - Foreign Currency Sensitivity Analysis (Details) - EUR (€) € in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Derivative [Line Items]
Sensitivity analysis, impact of 10 percent strengthening of foreign currency against the euro, impact on net income	€ (1.6)	€ (38.5)
Sensitivity analysis, impact of 10 percent strengthening of foreign currency against the euro, impact on net equity	95.6	80.9
US dollar
Derivative [Line Items]
Sensitivity analysis, impact of 10 percent strengthening of foreign currency against the euro, impact on net income	1.1	10.3
Sensitivity analysis, impact of 10 percent strengthening of foreign currency against the euro, impact on net equity	88.2	81.3
Japanese yen
Derivative [Line Items]
Sensitivity analysis, impact of 10 percent strengthening of foreign currency against the euro, impact on net income	(23.2)	(30.4)
Sensitivity analysis, impact of 10 percent strengthening of foreign currency against the euro, impact on net equity	7.4	(0.4)
Taiwanese dollar
Derivative [Line Items]
Sensitivity analysis, impact of 10 percent strengthening of foreign currency against the euro, impact on net income	(2.3)	(7.9)
Sensitivity analysis, impact of 10 percent strengthening of foreign currency against the euro, impact on net equity	0.0	0.0
South Korean won
Derivative [Line Items]
Sensitivity analysis, impact of 10 percent strengthening of foreign currency against the euro, impact on net income	21.8	(11.4)
Sensitivity analysis, impact of 10 percent strengthening of foreign currency against the euro, impact on net equity	0.0	0.0
Chinese yuan
Derivative [Line Items]
Sensitivity analysis, impact of 10 percent strengthening of foreign currency against the euro, impact on net income	(1.2)	1.7
Sensitivity analysis, impact of 10 percent strengthening of foreign currency against the euro, impact on net equity	0.0	0.0
Other currencies
Derivative [Line Items]
Sensitivity analysis, impact of 10 percent strengthening of foreign currency against the euro, impact on net income	2.2	(0.8)
Sensitivity analysis, impact of 10 percent strengthening of foreign currency against the euro, impact on net equity	€ 0.0	€ 0.0

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- Definition

Sensitivity Analysis, Impact Of Ten Percent Strengthening Of Foreign Currency Against The Euro, Increase (Decrease), Impact On Equity

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No definition available.

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Sensitivity Analysis, Impact Of Ten Percent Strengthening Of Foreign Currency Against The Euro, Increase (Decrease), Impact On Net Income

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 20
-Name Accounting Standards Codification
-Section 25
-Paragraph 6A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480682/815-20-25-6A

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480237/815-40-50-5

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