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Income taxes - Current and Deferred Tax Expense (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income Tax Disclosure [Abstract]      
Current year tax (expense) / benefit € (1,766.1) € (1,440.9) € (1,367.2)
Prior year tax (expense) / benefit 113.1 (55.8) (21.3)
Total income tax (expense) / benefit current (1,653.0) (1,496.7) (1,388.5)
Changes to recognition of operating losses and tax credits 3.0 (41.2) (37.2)
Prior year tax (expense) / benefit (85.2) 79.2 (2.4)
Tax rate changes 13.5 (1.1) 1.5
Origination and reversal of temporary differences, operating losses and tax credits 285.9 489.9 405.2
Total deferred tax (expense) / benefit € 217.2 € 526.8 € 367.1