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Business acquisitions and development projects - Additional Information (Details) resident_and_business in Thousands, customer in Thousands, $ in Thousands |  |  |  |  | 4 Months Ended
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Jun. 03, 2019 USD ($) resident_and_business | Dec. 04, 2018 CAD ($) customer km | Aug. 31, 2017 USD ($) | Aug. 10, 2017 USD ($) | Mar. 31, 2021 CAD ($)
Business Acquisition [Line Items] |  |  |  |  |
Number of residents and businesses using electrical services | resident_and_business | 63 |  |  |  |
Bermuda Electric Light Company |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business combination, purchase price | $ 365,000 |  |  |  |
New Brunswick Gas |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business combination, purchase price |  | $ 331,000,000 |  |  |
Number of propane gas distribution customers | customer |  | 12,000 |  |  |
Length of natural gas distribution pipeline | km |  | 800 |  |  |
St. Lawrence Gas Company, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business combination, purchase price |  |  | $ 70,000 |  |
Perris Water Distribution System |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business combination, purchase price |  |  |  | $ 11,500 |
Forecast | Mid-West Wind Development Project |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business combination, purchase price |  |  |  |  | $ 1,100,000

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