Equity investments - Summary of investments (Details) - EUR (€) € in Millions	12 Months Ended
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

Additions to Equity Securities Without Readily Determinable Fair Value

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- Definition

Disposals of Equity Securities Without Readily Determinable Fair Value

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No definition available.

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- Definition

Other Changes In Equity Securities Without Readily Determinable Fair Value

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- Definition

Purchase of Equity Investments

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No definition available.

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- Definition

Amount of investment in equity security without readily determinable fair value.

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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

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