| Expected volatility, share options granted | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Expected volatility, share options granted | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| The expected volatility of the share price used to calculate the fair value of the share options granted. Expected volatility is a measure of the amount by which a price is expected to fluctuate during a period. The measure of volatility used in option pricing models is the annualised standard deviation of the continuously compounded rates of return on the share over a period of time. | en | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Volatilidad esperada, opciones sobre acciones concedidas | es | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Descripción de la volatilidad esperada, opciones sobre acciones concedidas | es | http://www.xbrl.org/2003/role/terseLabel | http://www.xbrl.org/2003/role/link |
| Expected volatility, share options granted | en | http://www.xbrl.org/2003/role/terseLabel | http://www.xbrl.org/2003/role/link |