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Income taxes - Reconciliation of Beginning and Ending Balance of Liability for Unrecognized Tax Benefits (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
Unrecognized Tax Benefits [Roll Forward] |  |
Balance as at January 1 | € (214.0) | € (193.6)
Gross increases – tax positions in prior period | (25.9) | (39.7)
Gross decreases – tax positions in prior period | 62.2 | 11.0
Gross increases – tax positions in current period | (58.5) | (64.9)
Settlements | 60.3 | 69.9
Lapse of statute of limitations | 1.7 | 6.1
Effect of changes in exchange rates |  | (2.8)
Effect of changes in exchange rates | 13.4 |
Total liability for unrecognized tax benefits | (160.8) | (214.0)
Balance of accrued interest and penalties | (13.7) | (39.1)
Total liability for unrecognized tax benefits | € (174.5) | € (253.1)

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- Definition Unrecognized Tax Benefits Excluding Interest and Penalties + References No definition available. + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 217 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-217 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-15A Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10B -Publisher FASB -URI https://asc.fasb.org/1943274/2147482525/740-10-45-10B + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from foreign currency translation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-15A + Details
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