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Consolidated shareholders’ equity - Disclosure of Stock Subscription Option Plan Outstanding and Option Exercised (Details) |  |  |  |  |  |  |  | 12 Months Ended
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Apr. 30, 2019 shares | May 02, 2018 shares | May 10, 2017 shares | May 04, 2016 shares | Jun. 24, 2015 shares | Mar. 05, 2014 shares | Mar. 05, 2013 shares | Dec. 31, 2023 shares € / shares
Stock subscription option plan |  |  |  |  |  |  |  |
Disclosure of stock subscription option plan outstanding and option exercised [line items] |  |  |  |  |  |  |  |
Number of options outstanding (in shares) |  |  |  |  |  |  |  | 1,333,013
Stock subscription option plan four |  |  |  |  |  |  |  |
Disclosure of stock subscription option plan outstanding and option exercised [line items] |  |  |  |  |  |  |  |
Number of options granted (in shares) |  |  |  |  |  |  | 788,725 |
Exercise price (in euros per share) | € / shares |  |  |  |  |  |  |  | € 72.19
Number of options outstanding (in shares) |  |  |  |  |  |  |  | 0
Stock subscription option plan five |  |  |  |  |  |  |  |
Disclosure of stock subscription option plan outstanding and option exercised [line items] |  |  |  |  |  |  |  |
Number of options granted (in shares) |  |  |  |  |  | 1,009,250 |  |
Exercise price (in euros per share) | € / shares |  |  |  |  |  |  |  | € 73.48
Number of options outstanding (in shares) |  |  |  |  |  |  |  | 91,355
Stock subscription option plan six |  |  |  |  |  |  |  |
Disclosure of stock subscription option plan outstanding and option exercised [line items] |  |  |  |  |  |  |  |
Number of options granted (in shares) |  |  |  |  | 435,000 |  |  |
Exercise price (in euros per share) | € / shares |  |  |  |  |  |  |  | € 89.38
Number of options outstanding (in shares) |  |  |  |  |  |  |  | 337,714
Stock subscription option plan seven |  |  |  |  |  |  |  |
Disclosure of stock subscription option plan outstanding and option exercised [line items] |  |  |  |  |  |  |  |
Number of options granted (in shares) |  |  |  | 402,750 |  |  |  |
Exercise price (in euros per share) | € / shares |  |  |  |  |  |  |  | € 75.90
Number of options outstanding (in shares) |  |  |  |  |  |  |  | 264,750
Stock subscription option plan eight |  |  |  |  |  |  |  |
Disclosure of stock subscription option plan outstanding and option exercised [line items] |  |  |  |  |  |  |  |
Number of options granted (in shares) |  |  | 378,040 |  |  |  |  |
Exercise price (in euros per share) | € / shares |  |  |  |  |  |  |  | € 88.97
Number of options outstanding (in shares) |  |  |  |  |  |  |  | 257,010
Stock subscription option plan nine |  |  |  |  |  |  |  |
Disclosure of stock subscription option plan outstanding and option exercised [line items] |  |  |  |  |  |  |  |
Number of options granted (in shares) |  | 220,000 |  |  |  |  |  |
Exercise price (in euros per share) | € / shares |  |  |  |  |  |  |  | € 65.84
Number of options outstanding (in shares) |  |  |  |  |  |  |  | 168,784
Stock subscription option plan ten |  |  |  |  |  |  |  |
Disclosure of stock subscription option plan outstanding and option exercised [line items] |  |  |  |  |  |  |  |
Number of options granted (in shares) | 220,000 |  |  |  |  |  |  |
Exercise price (in euros per share) | € / shares |  |  |  |  |  |  |  | € 76.71
Number of options outstanding (in shares) |  |  |  |  |  |  |  | 213,400

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