Nature of the business, Description (Details)	Mar. 09, 2018
Algonquin [Member]
Nature of the business [Abstract]
Ownership interest	25.00%

The proportion of ownership interests in the entity held by non-controlling interests.

No definition available.

Name:	aby_ProportionOfOwnershipInterestsHeldByNoncontrollingInterestsInReportingEntity
Namespace Prefix:	aby_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration