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Equity investments - Summary of investments (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
Purchase of Equity Investments [Roll Forward] |  |
Balance at beginning of year | € 0.0 | € 0.0
Additions | 1,302.2 | 0.0
Disposals | 0.0 | 0.0
Other changes | 18.5 | 0.0
Balance at end of year | € 1,320.7 | € 0.0

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- Definition Disposals of Equity Securities Without Readily Determinable Fair Value + References No definition available. + Details
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- Definition Amount of investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 321 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479536/321-10-50-3 + Details
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