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Share-based payment arrangements - Measurement of fair value (Details) | 12 Months Ended
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Dec. 31, 2024 EUR (€) day € / shares | Dec. 31, 2022 € / shares | Dec. 31, 2021 € / shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Share price at grant date (in eur per share) |  | € 0 | € 0
Long term incentive plan 2015 | Tranche 1 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Fair value at grant date | € | € 1.853 |  |
Share price at grant date (in eur per share) | € 10.050 |  |
Exercise price (in eur per share) | € 10.0475 |  |
Expected volatility (weighted average) | 39.63% |  |
Expected life (days) (weighted average) | day | 365 |  |
Expected dividends | 8.00% |  |
Risk-free interest rate | 0.66% |  |
Long term incentive plan 2015 | Tranche 2 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Fair value at grant date | € | € 1.853 |  |
Share price at grant date (in eur per share) | € 10.050 |  |
Exercise price (in eur per share) | € 10.0475 |  |
Expected volatility (weighted average) | 39.63% |  |
Expected life (days) (weighted average) | day | 730 |  |
Expected dividends | 8.00% |  |
Risk-free interest rate | 0.66% |  |
Long term incentive plan 2015 | Tranche 3 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Fair value at grant date | € | € 1.853 |  |
Share price at grant date (in eur per share) | € 10.050 |  |
Exercise price (in eur per share) | € 10.0475 |  |
Expected volatility (weighted average) | 39.63% |  |
Expected life (days) (weighted average) | day | 1,095 |  |
Expected dividends | 8.00% |  |
Risk-free interest rate | 0.66% |  |
Transaction based incentive plan | Tranche 1 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Expected volatility (weighted average) | 33.43% |  |
Risk-free interest rate | 1.69% |  |
Expected vesting period (years) | 3 years 18 days |  |
Transaction based incentive plan | Tranche 2 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Expected volatility (weighted average) | 33.43% |  |
Risk-free interest rate | 1.69% |  |
Expected vesting period (years) | 3 years 4 months 17 days |  |
Transaction based incentive plan | Tranche 3 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Expected volatility (weighted average) | 33.43% |  |
Risk-free interest rate | 1.69% |  |
Expected vesting period (years) | 3 years 8 months 8 days |  |
Transaction based incentive plan | Tranche 4 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Expected volatility (weighted average) | 33.43% |  |
Risk-free interest rate | 1.69% |  |
Expected vesting period (years) | 3 years 11 months 23 days |  |
Long term incentive plan 2019 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Percentage of awards subject to relative total shareholder return | 75.00% |  |
Percentage of awards subject to absolute total shareholder return | 25.00% |  |
Long term incentive plan 2019 | Tranche 1 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Percentage of awards subject to relative total shareholder return | 25.00% |  |
Percentage of awards subject to absolute total shareholder return | 8.33% |  |
Long term incentive plan 2019 | Tranche 2 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Percentage of awards subject to relative total shareholder return | 25.00% |  |
Percentage of awards subject to absolute total shareholder return | 8.33% |  |
Long term incentive plan 2019 | Tranche 3 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Percentage of awards subject to relative total shareholder return | 25.00% |  |
Percentage of awards subject to absolute total shareholder return | 8.33% |  |

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