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Business acquisitions and dispositions - Additional Information (Details) - USD ($) $ in Thousands |  |  |  | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 19, 2024 | Jun. 26, 2024 | Feb. 15, 2024 | Jun. 30, 2024 | Jun. 30, 2023 | Mar. 31, 2025 | Jun. 30, 2024 | Jun. 30, 2023 | Aug. 08, 2024 | Mar. 01, 2024 | Jan. 04, 2024
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repayment of third-party construction loan |  |  |  | $ 1,250,081 | $ 194,403 |  | $ 2,751,033 | $ 398,179 |  |  |
Discontinued Operations, Held-for-Sale | Renewable Energy Business | Forecast |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Expected proceeds from sale of renewable energy business, net |  |  |  |  |  | $ 1,600,000 |  |  |  |  |
Future estimated pretax loss |  |  |  |  |  | $ 1,000,000 |  |  |  |  |
Discontinued Operations, Held-for-Sale | Renewable Energy Business | Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sale of renewable assets |  |  |  |  |  |  |  |  | $ 2,500,000 |  |
Cash |  |  |  |  |  |  |  |  | 2,280,000 |  |
Earn out agreement |  |  |  |  |  |  |  |  | $ 220,000 |  |
Discontinued Operations, Disposed of by Sale | Windsor Locks Thermal Facility |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sale of renewable assets |  |  |  |  |  |  |  |  |  | $ 17,721 |
Equity interest in investment sold (percent) |  |  |  |  |  |  |  |  |  | 100.00% |
Shady Oaks II Wind Facility | Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ownership interest acquired (percent) | 50.00% |  |  |  |  |  |  |  |  |  |
Repayment of third-party construction loan | $ 163,735 |  |  |  |  |  |  |  |  |  |
Liberty Development JV, Inc. & Algonquin (AY Holdco) B.V. |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ownership interest acquired (percent) |  |  |  |  |  |  |  |  |  |  | 50.00%
Liberty Development Energy Solutions B.V. |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ownership interest acquired (percent) |  |  |  |  |  |  |  |  |  |  | 50.00%
Consideration paid |  |  | $ 7,859 |  |  |  |  |  |  |  |
Consideration paid in excess of fair value |  |  | 8,696 |  |  |  |  |  |  |  |
Redeemable non-controlling interest reclassified to long-term debt |  |  | 306,500 |  |  |  |  |  |  |  |
Algonquin Power Fund (America) Inc | Shady Oaks II Wind Facility |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ownership interest acquired (percent) |  | 50.00% |  |  |  |  |  |  |  |  |
Consideration paid |  | $ 59,624 |  |  |  |  |  |  |  |  |
Algonquin Power Fund (America) Inc | New Market Solar Facility |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ownership interest acquired (percent) |  | 50.00% |  |  |  |  |  |  |  |  |
Consideration paid |  | $ 182,942 |  |  |  |  |  |  |  |  |
Repayment of outstanding related party note |  | $ 25,808 |  |  |  |  |  |  |  |  |
Algonquin Power Fund (America) Inc | Sandy Ridge II Wind Facility |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ownership interest acquired (percent) |  |  |  |  |  |  |  |  |  |  | 50.00%
Consideration paid |  |  | 44,139 |  |  |  |  |  |  |  |
Tax equity funding |  |  | 60,545 |  |  |  |  |  |  |  |
Repayment of third-party construction loan |  |  | $ 162,341 |  |  |  |  |  |  |  |

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