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Shareholders' equity - Narrative (Details) € / shares in Units, € in Millions |  |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 4 Months Ended | 5 Months Ended | 6 Months Ended | 7 Months Ended | 8 Months Ended | 9 Months Ended | 10 Months Ended | 11 Months Ended | 12 Months Ended | 35 Months Ended | 38 Months Ended |  |  |
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Jan. 28, 2026 EUR (€) € / shares | Apr. 23, 2025 | Dec. 31, 2025 shares | Nov. 30, 2025 € / shares shares | Oct. 31, 2025 shares | Sep. 30, 2025 shares | Aug. 31, 2025 € / shares shares | Jul. 31, 2025 shares | Jun. 30, 2025 shares | May 31, 2025 shares | Apr. 30, 2025 shares | Mar. 31, 2025 shares | Feb. 28, 2025 shares | Jan. 31, 2025 shares | Feb. 28, 2025 shares | Mar. 31, 2025 shares | Apr. 30, 2025 shares | May 31, 2025 shares | Jun. 30, 2025 shares | Jul. 31, 2025 shares | Aug. 31, 2025 shares | Sep. 30, 2025 shares | Oct. 31, 2025 shares | Nov. 30, 2025 shares | Dec. 31, 2025 EUR (€) registeredHolder director shares | Dec. 31, 2024 EUR (€) € / shares shares | Dec. 31, 2028 shares | Dec. 31, 2025 EUR (€) shares | Feb. 28, 2026 € / shares | Dec. 31, 2023 shares | Nov. 01, 2022 EUR (€)
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares, outstanding (in shares) |  |  | 385,417,665 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 385,417,665 | 393,283,720 |  | 385,417,665 |  | 393,421,721 |
Number of fractional shares (in shares) |  |  | 900 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 900 |  |  | 900 |  |  |
Maximum share and/or rights issuance, percentage over issued share capital (in percentage) |  | 0.05 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional share issuance, percentage over issued share capital (in percentage) |  | 0.05 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum restriction of preemptive rights, percentage over issued share capital (in percentage) |  | 0.05 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum percentage of issued share capital authorised, repurchase agreement (in percentage) |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum ordinary share purchase price, market price (in percentage) |  | 1.10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative preference shares, portion of subscription price payable at initial issuance |  |  | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  | 25.00% |  |  |
Period in which company to repurchase or cancel cumulative preference shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 months |  |  |  |  |  |
Number of independent members | director |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |
Dividends declared (in EUR per share) | € / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 6.40 |  |  |  |  |
Dividend payable, increase (in percentage) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17.20% |  |  |  |  |  |
Dividends paid (in EUR per share) | € / shares |  |  |  | € 1.60 |  |  | € 1.60 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total number of shares purchased (in shares) |  |  | 580,630 | 816,582 | 483,439 | 0 | 0 | 200,024 | 385,453 | 398,170 | 1,390,673 | 2,067,246 | 1,819,703 | 181,400 | 2,001,103 | 4,068,349 | 5,459,022 | 5,857,192 | 6,242,645 | 6,442,669 | 6,442,669 | 6,442,669 | 6,926,108 | 7,742,690 | 8,323,320 | 574,925 |  |  |  |  |
Treasury stock, repurchased | € |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 5,950.0 | € 500.0 |  |  |  |  |
Cancelled shares (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,683,018 | 5,754,117 |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared (in EUR per share) | € / shares | € 7.50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends payable (in EUR per share) | € / shares | € 2.70 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 1.60 |  |
Share Buyback Plan Program 2026-2028 | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share repurchase program, authorized, amount | € | € 12,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected shares to be purchased for award (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000.0 |  |  |  |
Share Buyback Plan Program 2022-2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share repurchase program, authorized, amount | € |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 12,000.0
Treasury stock, value, acquired, par value method | € |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 7,600.0 |  |  |
Cumulative preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares, issued (in shares) |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  | 0 |  |  |
United States |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares, outstanding (in shares) |  |  | 87,904,216 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 87,904,216 |  |  | 87,904,216 |  |  |
Number of registered holders | registeredHolder |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 316 |  |  |  |  |  |

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