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Segmented information - Schedule of Results of Operations and Assets for Segments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Revenue    
Revenue $ 2,263,970 $ 2,350,044
Other revenue 2,319,538 2,403,924
Fuel, power, water purchased and other cost of sales 594,329 743,504
Net revenue 1,725,209 1,660,420
Operating expenses 879,950 823,914
Depreciation and amortization 395,687 354,079
Asset impairment charge 0 1,481
Loss on foreign exchange 3,483 13,659
Operating income 446,089 467,287
Interest expense (363,576) (308,440)
Income from long-term investments 134,897 (83,935)
Other expenses (40,230) (137,027)
Earnings (loss) before income taxes 177,180 (62,115)
Property, plant and equipment 9,450,095 9,126,773
Investments carried at fair value 2,058 1,054,665
Equity-method investees 38,113 112,680
Total assets 13,266,121 14,186,996
Capital expenditures 763,830 748,659
Revenue related to alternative revenue programs, not recognized as revenue from contract with customers 30,396 32,839
Other revenue    
Revenue    
Other revenue 55,568 53,880
Corporate Group    
Revenue    
Revenue 0 0
Fuel, power, water purchased and other cost of sales 0 0
Net revenue 1,421 1,447
Operating expenses 9,357 3,990
Depreciation and amortization 1,763 1,232
Asset impairment charge   1,481
Loss on foreign exchange 3,483 13,659
Operating income (13,182) (18,915)
Interest expense (170,928) (146,264)
Income from long-term investments 101,434 (128,891)
Other expenses (7,964) (10,610)
Earnings (loss) before income taxes (90,640) (304,680)
Property, plant and equipment 28,971 34,751
Investments carried at fair value 0 1,052,703
Equity-method investees 0 500
Total assets 185,902 1,387,161
Capital expenditures 1,000 1,232
Corporate Group | Other revenue    
Revenue    
Other revenue 1,421 1,447
Regulated Services Group | Operating Segments    
Revenue    
Revenue 2,228,642 2,315,722
Fuel, power, water purchased and other cost of sales 594,116 742,974
Net revenue 1,687,881 1,623,885
Operating expenses 861,758 811,359
Depreciation and amortization 387,162 346,188
Asset impairment charge   0
Loss on foreign exchange 0 0
Operating income 438,961 466,338
Interest expense (191,733) (160,999)
Income from long-term investments 33,444 44,953
Other expenses (32,275) (121,146)
Earnings (loss) before income taxes 248,397 229,146
Property, plant and equipment 9,284,365 8,945,637
Investments carried at fair value 2,058 1,962
Equity-method investees 38,113 112,180
Total assets 12,927,864 12,658,955
Capital expenditures 756,230 740,768
Regulated Services Group | Operating Segments | Other revenue    
Revenue    
Other revenue 53,355 51,137
Regulated Services Group | Operating Segments    
Revenue    
Revenue 35,328 34,322
Fuel, power, water purchased and other cost of sales 213 530
Net revenue 35,907 35,088
Operating expenses 8,835 8,565
Depreciation and amortization 6,762 6,659
Asset impairment charge   0
Loss on foreign exchange 0 0
Operating income 20,310 19,864
Interest expense (915) (1,177)
Income from long-term investments 19 3
Other expenses 9 (5,271)
Earnings (loss) before income taxes 19,423 13,419
Property, plant and equipment 136,759 146,385
Investments carried at fair value 0 0
Equity-method investees 0 0
Total assets 152,355 140,880
Capital expenditures 6,600 6,659
Regulated Services Group | Operating Segments | Other revenue    
Revenue    
Other revenue $ 792 $ 1,296