| Receivables from contracts with customers | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Receivables from contracts with customers at beginning of period | en | http://www.xbrl.org/2003/role/periodStartLabel | http://www.xbrl.org/2003/role/link |
| Receivables from contracts with customers at end of period | en | http://www.xbrl.org/2003/role/periodEndLabel | http://www.xbrl.org/2003/role/link |
| Total receivables from contracts with customers | en | http://www.xbrl.org/2003/role/totalLabel | http://www.xbrl.org/2003/role/link |
| The amount of an entity’s right to consideration in exchange for goods or services that the entity has transferred to a customer that is unconditional. A right to consideration is unconditional if only the passage of time is required before payment of that consideration is due. | en | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Saamiset asiakassopimuksista | fi | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Yhteisöllä oleva ehdoton oikeus vastikkeeseen niistä tavaroista tai palveluista, jotka se on luovuttanut asiakkaalle. Oikeus vastikkeeseen on ehdoton, jos edellytetään vain ajan kulumista ennen kuin kyseinen vastike erääntyy maksettavaksi. | fi | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Saamiset asiakassopimuksista yhteensä | fi | http://www.xbrl.org/2003/role/totalLabel | http://www.xbrl.org/2003/role/link |
| Saamiset asiakassopimuksista kauden alussa | fi | http://www.xbrl.org/2003/role/periodStartLabel | http://www.xbrl.org/2003/role/link |
| Saamiset asiakassopimuksista kauden lopussa | fi | http://www.xbrl.org/2003/role/periodEndLabel | http://www.xbrl.org/2003/role/link |