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Cover Page
 12 Months Ended
Dec. 31, 2020
shares
Entity Information [Line Items]  
Document Type 40-F
Document Registration Statement false
Document Annual Report true
Document Period End Date Dec. 31, 2020
Current Fiscal Year End Date --12-31
Entity File Number 001-37946
Entity Registrant Name ALGONQUIN POWER & UTILITIES CORP.
Entity Incorporation, State or Country Code Z4
Entity Address, Address Line One 354 Davis Road
Entity Address, City or Town Oakville
Entity Address, State or Province ON
Entity Address, Postal Zip Code L6J 2X1
Entity Address, Country CA
City Area Code 905
Local Phone Number 465-4500
Annual Information Form true
Audited Annual Financial Statements true
Entity Common Stock, Shares Outstanding 597,142,219
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Emerging Growth Company false
Entity Central Index Key 0001174169
Amendment Flag false
Document Fiscal Period Focus FY
Document Fiscal Year Focus 2020
6.875% Fixed-to-Floating Subordinated Notes - Series 2018-A due October 17, 2078  
Entity Information [Line Items]  
Title of 12(b) Security 6.875% Fixed-to-Floating Subordinated Notes – Series 2018-A due October 17, 2078
Trading Symbol AQNA
Security Exchange Name NYSE
6.20% Fixed-to-Floating Subordinated Notes - Series 2019-A due July 1, 2079  
Entity Information [Line Items]  
Title of 12(b) Security 6.20% Fixed-to-Floating Subordinated Notes – Series 2019-A due July 1, 2079
Trading Symbol AQNB
Security Exchange Name NYSE
Common shares  
Entity Information [Line Items]  
Title of 12(b) Security Common shares, no par value
Trading Symbol AQN
Security Exchange Name NYSE
Business Contact  
Entity Information [Line Items]  
Entity Address, Address Line One 111 Eighth Avenue
Entity Address, City or Town New York
Entity Address, State or Province NY
Entity Address, Postal Zip Code 10011
City Area Code 212
Local Phone Number 894-8940
Contact Personnel Name CT Corporation System