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Equity investments - Narrative (Details) - EUR (€) € in Millions | Dec. 31, 2025 | Sep. 30, 2025 | Dec. 31, 2024 | Dec. 31, 2023
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Equity Securities without Readily Determinable Fair Value [Line Items] |  |  |  |
Equity investments | € 1,320.7 |  | € 0.0 | € 0.0
Mistral AI |  |  |  |
Equity Securities without Readily Determinable Fair Value [Line Items] |  |  |  |
Equity investments |  | € 1,300.0 |  |
Ownership percentage |  | 11.10% |  |

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