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Employee benefits - Pension and Retirement Expenses (Details) - EUR (€) € in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Compensation Related Costs [Abstract]
Pension plan based on multi-employer union plan	€ 296.6	€ 276.3	€ 244.4
Pension plans based on defined contribution and other plans	137.1	118.9	104.5
Pension and retirement expenses	€ 433.7	€ 395.2	€ 348.9

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- References

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- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 70
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480794/715-70-50-1

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- Definition

Amount of cost for employer contribution to multiemployer plan. Multiemployer plan includes, but is not limited to, pension plan determined to be individually significant and insignificant and other postretirement benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 80
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480576/715-80-50-11

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 80
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-URI https://asc.fasb.org/1943274/2147480606/715-80-35-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Amount of cost (reversal of cost) for pension and other postretirement benefits.

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