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Income taxes - Current and Deferred Tax Expense (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Income Tax Disclosure [Abstract] |  |  |
Current year tax (expense) / benefit | € (2,008.0) | € (1,535.6) | € (1,766.1)
Prior year tax (expense) / benefit | 10.9 | (211.2) | 113.1
Total income tax (expense) / benefit current | (1,997.1) | (1,746.8) | (1,653.0)
Changes to recognition of operating losses and tax credits | (52.4) | (24.9) | 3.0
Prior year tax (expense) / benefit | 51.7 | 93.1 | (85.2)
Tax rate changes | 16.4 | 0.0 | 13.5
Origination and reversal of temporary differences, operating losses and tax credits | (32.0) | (2.0) | 285.9
Total deferred tax (expense) / benefit | € (16.3) | € 66.2 | € 217.2

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