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Financial instruments - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Level 1 |  |
Fair Value of Financial Instruments [Line Items] |  |
Long-term investments carried at fair value | $ 1,076,642 | $ 1,054,665
Development loans and other receivables | 0 | 0
Total derivative instruments | 0 | 0
Total financial assets | 1,076,642 | 1,054,665
Long-term debt | 2,223,829 | 2,532,608
Convertible debentures | 262 | 276
Total derivative instruments | 0 | 0
Total financial liabilities | 2,224,091 | 2,532,884
Level 1 | Related Party |  |
Fair Value of Financial Instruments [Line Items] |  |
Notes payable to related party |  | 0
Level 1 | Interest rate forwards | Designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 0 | 0
Total derivative instruments |  | 0
Level 1 | Interest rate cap | Not designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments |  | 0
Level 1 | Congestion revenue rights | Not designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 0 | 0
Level 1 | Cross-currency interest rate swap | Designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 0 |
Total derivative instruments |  | 0
Level 1 | Cross-currency interest rate swap | Designated as a hedge | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 0 |
Level 1 | Cross-currency interest rate swap | Designated as a hedge | Net investment hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 0 | 0
Level 1 | Commodity contracts | Designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 0 |
Total derivative instruments |  | 0
Level 1 | Commodity contracts | Designated as a hedge | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 0 |
Level 1 | Energy contracts | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 0 |
Level 1 | Energy contracts | Designated as a hedge | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments |  | 0
Level 1 | Energy contracts | Not designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 0 | 0
Level 1 | Currency Forward Contract | Designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments |  | 0
Level 2 |  |
Fair Value of Financial Instruments [Line Items] |  |
Long-term investments carried at fair value | 0 | 0
Development loans and other receivables | 43,491 | 155,735
Total derivative instruments | 105,862 | 74,790
Total financial assets | 149,353 | 230,525
Long-term debt | 6,559,927 | 4,890,710
Convertible debentures | 0 | 0
Total derivative instruments | 37,922 | 37,213
Total financial liabilities | 6,597,849 | 4,943,243
Level 2 | Related Party |  |
Fair Value of Financial Instruments [Line Items] |  |
Notes payable to related party |  | 15,320
Level 2 | Interest rate forwards | Designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 95,723 | 72,936
Total derivative instruments |  | 11,790
Level 2 | Interest rate cap | Not designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments |  | 1,854
Level 2 | Congestion revenue rights | Not designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 0 | 0
Level 2 | Cross-currency interest rate swap | Designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 10,064 |
Total derivative instruments |  | 5,547
Level 2 | Cross-currency interest rate swap | Designated as a hedge | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 13,783 |
Level 2 | Cross-currency interest rate swap | Designated as a hedge | Net investment hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 23,203 | 10,533
Level 2 | Commodity contracts | Designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 75 |
Total derivative instruments |  | 2,564
Level 2 | Commodity contracts | Designated as a hedge | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 936 |
Level 2 | Energy contracts | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 0 |
Level 2 | Energy contracts | Designated as a hedge | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments |  | 0
Level 2 | Energy contracts | Not designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 0 | 0
Level 2 | Currency Forward Contract | Designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments |  | 6,779
Level 3 |  |
Fair Value of Financial Instruments [Line Items] |  |
Long-term investments carried at fair value | 51,529 | 61,064
Development loans and other receivables | 0 | 0
Total derivative instruments | 10,971 | 8,458
Total financial assets | 62,500 | 69,522
Long-term debt | 0 | 0
Convertible debentures | 0 | 0
Total derivative instruments | 92,135 | 73,663
Total financial liabilities | 92,135 | 73,663
Level 3 | Related Party |  |
Fair Value of Financial Instruments [Line Items] |  |
Notes payable to related party |  | 0
Level 3 | Interest rate forwards | Designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 0 | 0
Total derivative instruments |  | 0
Level 3 | Interest rate cap | Not designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments |  | 0
Level 3 | Congestion revenue rights | Not designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 10,971 | 8,458
Level 3 | Cross-currency interest rate swap | Designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 0 |
Total derivative instruments |  | 0
Level 3 | Cross-currency interest rate swap | Designated as a hedge | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 0 |
Level 3 | Cross-currency interest rate swap | Designated as a hedge | Net investment hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 0 | 0
Level 3 | Commodity contracts | Designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 0 |
Total derivative instruments |  | 0
Level 3 | Commodity contracts | Designated as a hedge | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 0 |
Level 3 | Energy contracts | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 85,630 |
Level 3 | Energy contracts | Designated as a hedge | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments |  | 68,070
Level 3 | Energy contracts | Not designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 6,505 | 5,593
Level 3 | Currency Forward Contract | Designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments |  | 0
Carrying amount |  |
Fair Value of Financial Instruments [Line Items] |  |
Long-term investments carried at fair value | 1,128,171 | 1,115,729
Development loans and other receivables | 31,479 | 158,110
Total derivative instruments | 116,833 | 83,248
Total financial assets | 1,276,483 | 1,357,087
Long-term debt | 8,292,649 | 8,516,030
Convertible debentures | 229 | 230
Total derivative instruments | 130,057 | 110,876
Total financial liabilities | 8,422,935 | 8,652,944
Carrying amount | Related Party |  |
Fair Value of Financial Instruments [Line Items] |  |
Notes payable to related party |  | 25,808
Carrying amount | Interest rate forwards | Designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 95,723 | 72,936
Total derivative instruments |  | 11,790
Carrying amount | Interest rate cap | Not designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments |  | 1,854
Carrying amount | Congestion revenue rights | Not designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 10,971 | 8,458
Carrying amount | Cross-currency interest rate swap | Designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 10,064 |
Total derivative instruments |  | 5,547
Carrying amount | Cross-currency interest rate swap | Designated as a hedge | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 13,783 |
Carrying amount | Cross-currency interest rate swap | Designated as a hedge | Net investment hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 23,203 | 10,533
Carrying amount | Commodity contracts | Designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 75 |
Total derivative instruments |  | 2,564
Carrying amount | Commodity contracts | Designated as a hedge | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 936 |
Carrying amount | Energy contracts | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 85,630 |
Carrying amount | Energy contracts | Designated as a hedge | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments |  | 68,070
Carrying amount | Energy contracts | Not designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 6,505 | 5,593
Carrying amount | Currency Forward Contract | Designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments |  | 6,779
Fair value |  |
Fair Value of Financial Instruments [Line Items] |  |
Long-term investments carried at fair value | 1,128,171 | 1,115,729
Development loans and other receivables | 43,491 | 155,735
Total derivative instruments | 116,833 | 83,248
Total financial assets | 1,288,495 | 1,354,712
Long-term debt | 8,783,756 | 7,423,318
Convertible debentures | 262 | 276
Total derivative instruments | 130,057 | 110,876
Total financial liabilities | 8,914,075 | 7,549,790
Fair value | Related Party |  |
Fair Value of Financial Instruments [Line Items] |  |
Notes payable to related party |  | 15,320
Fair value | Interest rate forwards | Designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 95,723 | 72,936
Total derivative instruments |  | 11,790
Fair value | Interest rate cap | Not designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments |  | 1,854
Fair value | Congestion revenue rights | Not designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 10,971 | 8,458
Fair value | Cross-currency interest rate swap | Designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 10,064 |
Total derivative instruments |  | 5,547
Fair value | Cross-currency interest rate swap | Designated as a hedge | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 13,783 |
Fair value | Cross-currency interest rate swap | Designated as a hedge | Net investment hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 23,203 | 10,533
Fair value | Commodity contracts | Designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 75 |
Total derivative instruments |  | 2,564
Fair value | Commodity contracts | Designated as a hedge | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 936 |
Fair value | Energy contracts | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 85,630 |
Fair value | Energy contracts | Designated as a hedge | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments |  | 68,070
Fair value | Energy contracts | Not designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | $ 6,505 | 5,593
Fair value | Currency Forward Contract | Designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments |  | $ 6,779

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