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Income Tax - Summary of Reconciliation of Expected Income Tax Benefit to Actual Income (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income Taxes [Abstract] |  |  |
Profit before tax | € 1,186.1 | € 12,954.1 | € 15,046.4
Expected tax credit | 321.8 | 3,529.7 | 4,622.5
Effects |  |  |
Deviation due to local tax basis | 6.6 | 8.9 | 9.1
Deviation due to deviating income tax rate (Germany and foreign countries) | (0.1) | 7.3 | 9.4
Change in valuation allowance | (14.3) | 30.6 | 3.0
Effects from tax losses and tax credits | (66.5) | 23.2 | 19.5
Change in deferred taxes due to tax rate change | (2.4) | (2.3) | (7.5)
Non-deductible expenses | 3.1 | 2.5 | 90.5
Non tax-effective income | (0.6) | (87.9) | (0.3)
Non tax-effective share-based payment expenses | 7.7 | 8.7 | 15.5
Tax-effective equity transaction costs | 0.0 | 0.0 | (1.2)
Adjustment prior year taxes | 5.5 | (31.5) | (2.9)
Non-tax effective bargain purchase | 0.0 | 0.0 | (0.7)
Other effects | (5.0) | 30.5 | (3.0)
Income taxes | € 255.8 | € 3,519.7 | € 4,753.9
Effective tax rate | 21.60% | 27.20% | 31.60%

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