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Business segment data - Schedule of Segment Reporting Information, by Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Mar. 31, 2024 | Jun. 30, 2023 | Mar. 31, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues | $ 1,047,545 |  | $ 1,091,126 |  | $ 2,261,370 | $ 2,521,224
Operating income | 89,746 |  | 82,031 |  | 225,693 | 200,553
Income from continuing operations | 60,574 |  | 147,633 |  | 161,472 | 231,508
Discontinued operations, net of tax | (138) |  | (16,941) |  | (138) | (62,464)
Net income | 60,436 | $ 100,898 | 130,692 | $ 38,353 | 161,334 | 169,044
Operating Segments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues | 1,056,960 |  | 1,099,140 |  | 2,301,252 | 2,555,606
Operating Segments | Electric |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues | 99,157 |  | 90,989 |  | 206,883 | 186,686
Operating income | 18,631 |  | 21,561 |  | 41,419 | 42,654
Operating Segments | Natural gas distribution |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues | 201,431 |  | 218,995 |  | 660,901 | 784,590
Operating income | 1,204 |  | 2,428 |  | 59,442 | 60,932
Operating Segments | Pipeline |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues | 43,831 |  | 34,209 |  | 64,843 | 48,683
Operating income | 23,272 |  | 13,886 |  | 45,922 | 26,926
Operating Segments | Construction services |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues | 703,124 |  | 746,933 |  | 1,328,726 | 1,501,265
Operating income | 51,309 |  | 54,310 |  | 90,193 | 89,527
Operating Segments | Other |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues | 2 |  | 0 |  | 17 | 0
Operating income | (4,670) |  | (10,154) |  | (11,283) | (19,486)
Intersegment eliminations |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues | (10,833) |  | (11,165) |  | (42,732) | (39,105)
Regulated operation |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues | 340,544 |  | 340,492 |  | 926,561 | 1,014,423
Income from continuing operations | 27,360 |  | 21,832 |  | 100,703 | 86,296
Regulated operation | Operating Segments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues | 340,544 |  | 340,492 |  | 926,561 | 1,014,423
Regulated operation | Operating Segments | Electric |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues | 99,157 |  | 90,989 |  | 206,883 | 186,686
Income from continuing operations | 15,527 |  | 16,338 |  | 33,396 | 32,945
Regulated operation | Operating Segments | Natural gas distribution |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues | 201,431 |  | 218,995 |  | 660,901 | 784,590
Income from continuing operations | (5,007) |  | (3,157) |  | 35,063 | 35,771
Regulated operation | Operating Segments | Pipeline |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues | 39,956 |  | 30,508 |  | 58,777 | 43,147
Income from continuing operations | 16,840 |  | 8,651 |  | 32,244 | 17,580
Regulated operation | Intersegment eliminations |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues | (8,967) |  | (7,795) |  | (39,327) | (34,152)
Regulated operation | Intersegment eliminations | Electric |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues | (64) |  | (27) |  | (93) | (55)
Regulated operation | Intersegment eliminations | Natural gas distribution |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues | (49) |  | (69) |  | (105) | (139)
Regulated operation | Intersegment eliminations | Pipeline |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues | (8,854) |  | (7,699) |  | (39,129) | (33,958)
Nonregulated operation |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues | 707,001 |  | 750,634 |  | 1,334,809 | 1,506,801
Income from continuing operations | 33,214 |  | 125,801 |  | 60,769 | 145,212
Nonregulated operation | Operating Segments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues | 707,001 |  | 750,634 |  | 1,334,809 | 1,506,801
Nonregulated operation | Operating Segments | Pipeline |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues | 3,875 |  | 3,701 |  | 6,066 | 5,536
Income from continuing operations | 419 |  | 286 |  | 73 | (172)
Nonregulated operation | Operating Segments | Construction services |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues | 703,124 |  | 746,933 |  | 1,328,726 | 1,501,265
Income from continuing operations | 38,971 |  | 41,167 |  | 67,186 | 69,976
Nonregulated operation | Operating Segments | Other |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues | 2 |  | 0 |  | 17 | 0
Income from continuing operations | (6,176) |  | 84,348 |  | (6,490) | 75,408
Nonregulated operation | Intersegment eliminations |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues | (1,866) |  | (3,370) |  | (3,405) | (4,953)
Nonregulated operation | Intersegment eliminations | Pipeline |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues | (201) |  | (219) |  | (236) | (230)
Nonregulated operation | Intersegment eliminations | Construction services |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues | (249) |  | 0 |  | (336) | 0
Nonregulated operation | Intersegment eliminations | Other |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues | $ (1,416) |  | $ (3,151) |  | $ (2,833) | $ (4,723)

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