| De winst voor aftrek van renten, belastingen en afschrijvingen van immateriële en materiële vaste activa (Earnings Before deduction of Interest, Tax, Depreciation and Amortisation). | nl | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| EBITDA | de | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| EBITDA | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| EBITDA | fr | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| EBITDA | nl | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Ergebnis vor Zinsen, Steuern, Abschreibung und Amortisation | de | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| Earnings Before Interest, Taxes, Depreciation and Amortisation | en | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| Earnings Before Interest, Taxes, Depreciation and Amortisation | fr | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| Earnings Before Interest, Taxes, Depreciation and Amortisation | nl | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |