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Income taxes - Current and Deferred Tax Expense (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Income Tax Disclosure [Abstract]      
Current year tax (expense) / benefit € (1,535.6) € (1,766.1) € (1,440.9)
Prior year tax (expense) / benefit (211.2) 113.1 (55.8)
Total income tax (expense) / benefit current (1,746.8) (1,653.0) (1,496.7)
Changes to recognition of operating losses and tax credits (24.9) 3.0 (41.2)
Prior year tax (expense) / benefit 93.1 (85.2) 79.2
Tax rate changes 0.0 13.5 (1.1)
Origination and reversal of temporary differences, operating losses and tax credits (2.0) 285.9 489.9
Total deferred tax (expense) / benefit € 66.2 € 217.2 € 526.8