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Other general administrative expenses - Narrative (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Disclosure of attribution of expenses by nature to their function [line items] |  |  |
Auditor's remuneration | € 140.7 | € 144.2 | € 133.6
Commissioned services from audit firms | 155.9 | € 206.2 | € 174.1
BDO |  |  |
Disclosure of attribution of expenses by nature to their function [line items] |  |  |
Auditor's remuneration | € 1.9 |  |

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