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Long-term debt - Additional Information (Details) - USD ($) |  |  |  | 3 Months Ended | 6 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 19, 2024 | Jun. 20, 2024 | Apr. 30, 2024 | Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Mar. 28, 2024 | Mar. 27, 2024 | Jan. 30, 2024 | Jan. 29, 2024 | Jan. 12, 2024 | Jan. 08, 2024 | Dec. 31, 2023
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term debt |  |  |  | $ 864,197,000 |  | $ 864,197,000 |  |  |  |  |  |  |  |
Revolving and term credit facilities |  |  |  | 4,589,200,000 |  | 4,589,200,000 |  |  |  |  |  |  |  | $ 4,562,000,000
Repayment of third-party construction loan |  |  |  | 1,250,081,000 | $ 194,403,000 | 2,751,033,000 | $ 398,179,000 |  |  |  |  |  |  |
Interest on long-term debt |  |  |  | 99,851,000 |  | 99,851,000 |  |  |  |  |  |  |  | $ 74,493,000
Shady Oaks II Wind Facility | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of third-party construction loan | $ 163,735,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest acquired (percent) | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Senior unsecured revolving credit facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit increase (decrease), net |  |  |  |  |  |  |  |  |  |  | $ 25,000,000 |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  | $ 100,000,000 |  |  |
Senior unsecured revolving credit facilities | Bermuda Working Capital Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving and term credit facilities |  |  |  | $ 25,000,000 |  | $ 25,000,000 |  |  |  |  |  |  |  |
Senior unsecured bank credit facilities and delayed draw term facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  | $ 306,500,000 |
Debt prepaid |  | $ 306,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Senior unsecured notes (Green Equity Units) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face value |  |  |  |  |  |  |  | $ 1,150,000,000 |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  | 5.365% | 1.18% |  |  |  |  |
Senior unsecured notes (Green Equity Units) | Senior Notes Due on January 31,2029 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  |  |  | 5.577% |  |
Senior unsecured notes (Green Equity Units) | Senior Notes Due on January 31, 2034 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  |  |  | 5.869% |  |
Senior unsecured notes (Green Equity Units) | Due On 2029 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  |  |  | 99.996% |  |
Senior unsecured notes (Green Equity Units) | Due On 2034 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  |  |  | 99.995% |  |
Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt prepaid |  |  | $ 70,000,000 |  |  |  |  |  |  |  |  |  |  |
Senior Unsecured Notes | Senior Notes Due on January 31,2029 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face value |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000 |  |
Senior Unsecured Notes | Senior Notes Due on January 31, 2034 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face value |  |  |  |  |  |  |  |  |  |  |  | $ 350,000,000 |  |
Senior secured utility bonds | Securitized Utility Tariff Bonds Due On January 2035 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face value |  |  |  |  |  |  |  |  |  | $ 180,500,000 |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  | 4.943% |  |  |  |
Senior secured utility bonds | Securitized Utility Tariff Bonds Due On January 2039 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face value |  |  |  |  |  |  |  |  |  | $ 125,000,000 |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  | 5.091% |  |  |  |

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