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Segmented information - Results of Operations and Assets for Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Revenue          
Revenue $ 569,973 $ 605,336 $ 1,279,380 $ 1,358,584  
Other revenue 598,626 627,871 1,335,726 1,406,498  
Fuel, power and water purchased 109,625 142,156 310,967 417,112  
Net revenue 489,001 485,715 1,024,759 989,386  
Operating expenses (3) 265,868 267,174 527,653 505,294  
Depreciation and amortization 136,912 118,448 266,452 240,089  
Loss on foreign exchange 4,284 6,379 16,141 7,815  
Operating income 81,937 93,714 214,513 236,188  
Interest expense (105,787) (89,663) (208,311) (171,581)  
Income (loss) from long-term investments and other income 198,641 (277,696) 50,887 (57,684)  
Other expenses (20,978) (44,634) (34,884) (50,891)  
Earnings (loss) before income taxes 153,813 (318,279) 22,205 (43,968)  
Capital expenditures 204,336 245,209 416,882 414,958  
Property, plant and equipment 13,199,200   13,199,200   $ 12,517,450
Investments carried at fair value 1,128,171   1,128,171   1,115,729
Equity-method investees 352,983   352,983   456,393
Total assets 18,866,374   18,866,374   18,373,961
Revenue related to net hedging loss, not recognized as revenue from contract with customers   4,328 16,614 11,527  
Revenue related to alternative revenue programs, not recognized as revenue from contract with customers   9,083 18,301 12,789  
Other revenue          
Revenue          
Other revenue 28,653 22,535 56,346 47,914  
Corporate          
Revenue          
Revenue 0 0 0 0  
Fuel, power and water purchased 0 0 0 0  
Net revenue 195 364 605 725  
Operating expenses (3) 2,402 (40) 3,061 799  
Depreciation and amortization 239 403 500 642  
Loss on foreign exchange 4,284 6,379 16,141 7,815  
Operating income (6,730) (6,378) (19,097) (8,531)  
Interest expense (37,687) (30,519) (71,706) (59,064)  
Income (loss) from long-term investments and other income 173,518 (309,870) 15,821 (129,928)  
Other expenses (4,555) (2,427) (13,458) (4,435)  
Earnings (loss) before income taxes 124,546 (349,194) (88,440) (201,958)  
Capital expenditures 0 0 0 0  
Corporate | Other revenue          
Revenue          
Other revenue 195 364 605 725  
Regulated Services Group          
Revenue          
Revenue related to alternative revenue programs, not recognized as revenue from contract with customers 15,334        
Regulated Services Group | Operating Segments          
Revenue          
Revenue 491,312 533,642 1,116,143 1,208,174  
Fuel, power and water purchased 108,934 138,374 306,738 405,524  
Net revenue 396,318 408,059 835,094 829,088  
Operating expenses (3) 215,708 228,847 423,239 425,699  
Depreciation and amortization 100,120 84,754 192,140 170,611  
Loss on foreign exchange 0 0 0 0  
Operating income 80,490 94,458 219,715 232,778  
Interest expense (49,476) (42,724) (98,186) (81,202)  
Income (loss) from long-term investments and other income 7,456 9,332 15,377 19,660  
Other expenses (8,537) (41,010) (12,228) (45,259)  
Earnings (loss) before income taxes 29,933 20,056 124,678 125,977  
Capital expenditures 167,834 225,505 351,048 372,886  
Property, plant and equipment 9,051,366   9,051,366   8,945,637
Investments carried at fair value 1,905   1,905   1,962
Equity-method investees 39,012   39,012   112,180
Total assets 12,690,910   12,690,910   12,658,955
Regulated Services Group | Operating Segments | Other revenue          
Revenue          
Other revenue 13,940 12,791 25,689 26,438  
Renewable Energy Group          
Revenue          
Revenue related to net hedging loss, not recognized as revenue from contract with customers 6,965        
Development costs 7,734 3,274 16,290 7,261  
Other operating costs 6,709 7,356 12,738 11,088  
Renewable Energy Group | Operating Segments          
Revenue          
Revenue 78,661 71,694 163,237 150,410  
Fuel, power and water purchased 691 3,782 4,229 11,588  
Net revenue 92,488 77,292 189,060 159,573  
Operating expenses (3) 47,758 38,367 101,353 78,796  
Depreciation and amortization 36,553 33,291 73,812 68,836  
Loss on foreign exchange 0 0 0 0  
Operating income 8,177 5,634 13,895 11,941  
Interest expense (18,624) (16,420) (38,419) (31,315)  
Income (loss) from long-term investments and other income 17,667 22,842 19,689 52,584  
Other expenses (7,886) (1,197) (9,198) (1,197)  
Earnings (loss) before income taxes (666) 10,859 (14,033) 32,013  
Capital expenditures 36,502 19,704 65,834 42,072  
Property, plant and equipment 4,120,034   4,120,034   3,539,069
Investments carried at fair value 1,126,266   1,126,266   1,113,767
Equity-method investees 313,971   313,971   343,712
Total assets 5,809,815   5,809,815   5,367,011
Renewable Energy Group | Operating Segments | Other revenue          
Revenue          
Other revenue 14,518 $ 9,380 30,052 $ 20,751  
Corporate | Corporate          
Revenue          
Property, plant and equipment 27,800   27,800   32,744
Investments carried at fair value 0   0   0
Equity-method investees 0   0   501
Total assets $ 365,649   $ 365,649   $ 347,995