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Business acquisitions and development projects - Acquisition of New Brunswick Gas and St. Lawrence Gas Company, Inc. (Details) $ in Thousands, $ in Thousands |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Nov. 01, 2019 USD ($) | Oct. 01, 2019 USD ($) | Oct. 01, 2019 CAD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 CAD ($) | Dec. 31, 2017 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill |  |  |  | $ 1,031,696 | $ 954,282 | $ 954,282 | $ 954,282
New Brunswick Gas |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Total purchase price |  | $ 256,011 | $ 339,036 |  |  |  |
Working capital |  | 8,782 |  |  |  |  |
Property, plant and equipment |  | 137,668 |  |  |  |  |
Goodwill |  | 56,054 |  |  |  |  |
Regulatory assets |  | 94,827 |  |  |  |  |
Deferred income tax assets, net |  | 0 |  |  |  |  |
Other assets |  | 125 |  |  |  |  |
Regulatory liabilities |  | (2,076) |  |  |  |  |
Pension and post-employment benefits |  | 0 |  |  |  |  |
Deferred income tax liability, net |  | (38,053) |  |  |  |  |
Other liabilities |  | (1,316) |  |  |  |  |
Total net assets acquired |  | 256,011 |  |  |  |  |
Cash and cash equivalents |  | 7,248 |  |  |  |  |
Total net assets acquired, net of cash and cash equivalent |  | $ 248,763 |  |  |  |  |
Intangible asset, useful life |  |  |  | 47 years |  |  |
St. Lawrence Gas Company, Inc. |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Total purchase price | $ 61,820 |  |  |  |  |  |
Working capital | 3,403 |  |  |  |  |  |
Property, plant and equipment | 49,936 |  |  |  |  |  |
Goodwill | 20,259 |  |  |  |  |  |
Regulatory assets | 3,562 |  |  |  |  |  |
Deferred income tax assets, net | 1,614 |  |  |  |  |  |
Other assets | 6,418 |  |  |  |  |  |
Regulatory liabilities | (10,412) |  |  |  |  |  |
Pension and post-employment benefits | (12,376) |  |  |  |  |  |
Deferred income tax liability, net | 0 |  |  |  |  |  |
Other liabilities | (584) |  |  |  |  |  |
Total net assets acquired | 61,820 |  |  |  |  |  |
Cash and cash equivalents | 1,225 |  |  |  |  |  |
Total net assets acquired, net of cash and cash equivalent | $ 60,595 |  |  |  |  |  |
Intangible asset, useful life |  |  |  | 49 years |  |  |

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