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Cover Page - shares
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Entity Information [Line Items]      
Document Type 40-F    
Document Registration Statement false    
Document Annual Report true    
Document Period End Date Dec. 31, 2021    
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    
Security Exchange Name NYSE    
Annual Information Form true    
Audited Annual Financial Statements true    
Common Stock, Shares, Outstanding 671,960,276 597,142,219 524,223,323
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 2021    
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    
Corporate Units      
Entity Information [Line Items]      
Title of 12(b) Security Corporate Units    
Trading Symbol AQNU    
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