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Cover Page Document
 12 Months Ended
Dec. 31, 2019
shares
Entity Information [Line Items]  
Document Type 40-F
Document Registration Statement false
Document Annual Report true
Document Period End Date Dec. 31, 2019
Entity File Number 001-37946
Entity Registrant Name ALGONQUIN POWER & UTILITIES CORP.
Entity Incorporation, State or Country Code Z4
Entity Primary SIC Number 4911
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
Security Reporting Obligation 15(d)
Annual Information Form true
Audited Annual Financial Statements true
Entity Common Stock, Shares Outstanding 524,223,323
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Emerging Growth Company false
Amendment Flag false
Document Fiscal Year Focus 2019
Document Fiscal Period Focus FY
Entity Central Index Key 0001174169
Current Fiscal Year End Date --12-31
Business Contact  
Entity Information [Line Items]  
Contact Personnel Name CT Corporation System
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
NEW YORK STOCK EXCHANGE, INC.  
Entity Information [Line Items]  
Title of 12(b) Security Rights to Purchase One Common Share of the Company
Common Stock | NEW YORK STOCK EXCHANGE, INC.  
Entity Information [Line Items]  
Title of 12(b) Security Common shares, no par value
Trading Symbol AQN
Security Exchange Name NYSE
6.875% Fixed-to-Floating Subordinated Notes | NEW YORK STOCK EXCHANGE, INC.  
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 | NEW YORK STOCK EXCHANGE, INC.  
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
Rights to Purchase One Common Share of the Company | NEW YORK STOCK EXCHANGE, INC.  
Entity Information [Line Items]  
Security Exchange Name NYSE
No Trading Symbol Flag