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Document and Entity Information
 12 Months Ended
Dec. 31, 2018
shares
Document Documentand Entity Information [Abstract]  
Document Type 40-F
Amendment Flag false
Document Period End Date Dec. 31, 2018
Document Fiscal Year Focus 2018
Document Fiscal Period Focus FY
Trading Symbol AQUNF
Entity Registrant Name ALGONQUIN POWER & UTILITIES CORP.
Entity Central Index Key 0001174169
Current Fiscal Year End Date --12-31
Entity Current Reporting Status Yes
Entity Common Stock, Shares Outstanding 488,851,433