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Long-term debt - Narrative (Details) - USD ($) | Oct. 25, 2024 | Apr. 30, 2024 | Dec. 31, 2024 | Oct. 30, 2024 | Jun. 17, 2024 | Mar. 28, 2024 | Mar. 27, 2024 | Jan. 30, 2024 | Jan. 29, 2024 | Jan. 12, 2024 | Jan. 08, 2024 | Dec. 31, 2023
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Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Short-term debt |  |  | $ 118,286,000 |  |  |  |  |  |  |  |  |
Interest on long-term debt |  |  | $ 76,956,000 |  |  |  |  |  |  |  |  | $ 60,782,000
Senior unsecured revolving credit facilities |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of credit increase |  |  |  |  |  |  |  |  | $ 25,000,000 |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  | $ 25,000,000 |  |  |  |  | $ 100,000,000 |  |  |
Short Term Regulated Services Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, terminated | $ 500,000,000 |  |  |  |  |  |  |  |  |  |  |
Senior unsecured bank credit facilities and delayed draw term facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  | $ 306,500,000 |
Delayed Draw Term Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt repaid upon maturity | $ 610,386,000 |  |  |  |  |  |  |  |  |  |  |
Senior unsecured notes (Green Equity Units) |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Par value |  |  |  |  |  | $ 1,150,000,000 |  |  |  |  |  |
Debt instrument, effective interest rate |  |  |  |  |  | 5.365% | 1.18% |  |  |  |  |
Purchase contract |  |  |  |  | $ 50.00 |  |  |  |  |  |  |
Purchase contract, shares issued |  |  |  |  | 3.3439 |  |  |  |  |  |  |
Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt repaid upon maturity |  | $ 70,000,000 |  |  |  |  |  |  |  |  |  |
Senior Notes Due on January 31,2029 | Senior unsecured notes (Green Equity Units) |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, effective interest rate |  |  |  |  |  |  |  |  |  | 5.577% |  |
Senior Notes Due on January 31,2029 | Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Par value |  |  |  |  |  |  |  |  |  | $ 500,000,000 |  |
Senior Notes Due on January 31, 2034 | Senior unsecured notes (Green Equity Units) |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, effective interest rate |  |  |  |  |  |  |  |  |  | 5.869% |  |
Senior Notes Due on January 31, 2034 | Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Par value |  |  |  |  |  |  |  |  |  | $ 350,000,000 |  |
Due On 2029 Notes | Senior unsecured notes (Green Equity Units) |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, effective interest rate |  |  |  |  |  |  |  |  |  | 99.996% |  |
Due On 2034 Notes | Senior unsecured notes (Green Equity Units) |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, effective interest rate |  |  |  |  |  |  |  |  |  | 99.995% |  |
Securitized Utility Tariff Bonds Due On January 2035 | Senior Secured Utility Bonds |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Par value |  |  |  |  |  |  |  | $ 180,500,000 |  |  |  |
Debt instrument, effective interest rate |  |  |  |  |  |  |  | 4.943% |  |  |  |
Securitized Utility Tariff Bonds Due On January 2039 | Senior Secured Utility Bonds |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Par value |  |  |  |  |  |  |  | $ 125,000,000 |  |  |  |
Debt instrument, effective interest rate |  |  |  |  |  |  |  | 5.091% |  |  |  |

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