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Consolidated shareholders' equity - Summary of number of shares used to compute diluted earnings per share (Details) - € / shares | 6 Months Ended
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Jun. 30, 2026 | Jun. 30, 2025
Share Capital, Reserves And Other Equity Interest [Abstract] |  |
Basic earnings per share from continuing operations (in euros per share) | € 1.61 | € 2.40
Basic earnings per share from discontinued operations (in euros per share) | 0.02 | 2.34
Diluted earnings per share from continuing operations (in euros per share) | 1.60 | 2.39
Diluted earnings per share from discontinued operations (in euros per share) | € 0.02 | € 2.33

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