Earnings per Share - Summary of Income and Share Data Used in the Basic and diluted EPS Calculations (Details) - EUR (€) € / shares in Units, € in Millions, shares in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Earnings per share [abstract]
Profit attributable to ordinary equity holders of the parent for basic earnings	€ (665.3)	€ 930.3	€ 9,434.4
Weighted average number of ordinary shares outstanding for basic EPS (in shares)	240.4	240.6	243.3
Effects of dilution from share options (in shares)	0.0	2.1	6.5
Weighted average number of ordinary shares outstanding adjusted for the effect of dilution (in shares)	240.4	242.7	249.8
Earnings / (Loss) per share
Basic profit for the period per share (in euros per share)	€ (2.77)	€ 3.87	€ 38.78
Diluted profit for the period per share (in euros per share)	€ (2.77)	€ 3.83	€ 37.77

The weighted average number of ordinary shares outstanding plus the weighted average number of ordinary shares that would be issued on the conversion of all the dilutive potential ordinary shares into ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]]

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The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator) divided by the weighted average number of ordinary shares outstanding during the period (the denominator).

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The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator), divided by the weighted average number of ordinary shares outstanding during the period (the denominator), both adjusted for the effects of all dilutive potential ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]]

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The potential dilutive effect on the weighted average number of ordinary shares that relate to the assumed exercise of the entity's share options.

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The profit (loss) from continuing and discontinued operations attributable to owners of the parent. [Refer: Profit (loss)]

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The number of ordinary shares outstanding at the beginning of the period, adjusted by the number of ordinary shares bought back or issued during the period multiplied by a time-weighting factor.

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