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SEGMENT INFORMATION (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 USD ($) | Jun. 30, 2024 USD ($) | Mar. 31, 2024 USD ($) | Sep. 30, 2023 USD ($) | Jun. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) | Sep. 30, 2024 USD ($) numberOfSegments | Sep. 30, 2023 USD ($)
Segment information |  |  |  |  |  |  |  |
Number of reportable segments | numberOfSegments |  |  |  |  |  |  | 6 |
Operating revenues | $ 1,863.5 |  |  | $ 1,957.4 |  |  | $ 6,315.7 | $ 6,675.5
Other operation and maintenance | 566.8 |  |  | 516.6 |  |  | 1,631.0 | 1,546.6
Depreciation and amortization | 340.5 |  |  | 320.3 |  |  | 1,010.5 | 939.7
Equity in earnings of transmission affiliates | 46.7 |  |  | 44.7 |  |  | 138.3 | 132.1
Interest expense | 204.2 |  |  | 182.5 |  |  | 596.8 | 533.4
Income tax expense (benefit) | 31.6 |  |  | 60.4 |  |  | 160.9 | 183.0
Net income (loss) | 238.6 |  |  | 315.6 |  |  | 1,071.2 | 1,113.2
Net income (loss) attributed to common shareholders | 240.1 | $ 211.3 | $ 622.3 | 316.0 | $ 289.7 | $ 507.5 | 1,073.7 | 1,113.2
External revenues |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |
Operating revenues | 1,863.5 |  |  | 1,957.4 |  |  | 6,315.7 | 6,675.5
Intersegment revenues |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |
Operating revenues | 0.0 |  |  | 0.0 |  |  | 0.0 | 0.0
Utility operations |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |
Other operation and maintenance | 552.6 |  |  | 495.3 |  |  | 1,586.5 | 1,493.4
Depreciation and amortization | 308.3 |  |  | 285.8 |  |  | 911.3 | 841.4
Equity in earnings of transmission affiliates | 0.0 |  |  | 0.0 |  |  | 0.0 | 0.0
Interest expense | 186.7 |  |  | 174.4 |  |  | 558.3 | 526.4
Income tax expense (benefit) | 43.0 |  |  | 76.2 |  |  | 247.9 | 261.1
Net income (loss) | 185.8 |  |  | 262.1 |  |  | 837.3 | 885.6
Net income (loss) attributed to common shareholders | 185.5 |  |  | 261.8 |  |  | 836.4 | 884.7
Utility operations | External revenues |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |
Operating revenues | 1,816.6 |  |  | 1,912.9 |  |  | 6,162.0 | 6,538.8
Utility operations | Intersegment revenues |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |
Operating revenues | 0.0 |  |  | 0.0 |  |  | 0.0 | 0.0
Reconciling eliminations |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |
Other operation and maintenance | (1.6) |  |  | (1.5) |  |  | (7.1) | (7.0)
Depreciation and amortization | (22.6) |  |  | (19.6) |  |  | (65.3) | (57.2)
Equity in earnings of transmission affiliates | 0.0 |  |  | 0.0 |  |  | 0.0 | 0.0
Interest expense | (89.7) |  |  | (88.0) |  |  | (269.7) | (261.3)
Income tax expense (benefit) | 0.0 |  |  | 0.0 |  |  | 0.0 | 0.0
Net income (loss) | 0.0 |  |  | 0.0 |  |  | 0.0 | 0.0
Net income (loss) attributed to common shareholders | 0.0 |  |  | 0.0 |  |  | 0.0 | 0.0
Reconciling eliminations | External revenues |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |
Operating revenues | 0.0 |  |  | 0.0 |  |  | 0.0 | 0.0
Reconciling eliminations | Intersegment revenues |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |
Operating revenues | $ (116.2) |  |  | (115.3) |  |  | $ (355.9) | (358.4)
ATC |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |
Ownership interest (as a percent) | 60.00% |  |  |  |  |  | 60.00% |
Equity in earnings of transmission affiliates | $ 46.1 |  |  | 44.2 |  |  | $ 136.7 | 130.2
ATC Holdco |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |
Ownership interest (as a percent) | 75.00% |  |  |  |  |  | 75.00% |
Equity in earnings of transmission affiliates | $ 0.6 |  |  | 0.5 |  |  | $ 1.6 | 1.9
Wisconsin | Operating Segments |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |
Operating revenues | 1,590.0 |  |  | 1,622.0 |  |  | 4,737.0 | 5,042.8
Wisconsin | Operating Segments | Utility operations |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |
Other operation and maintenance | 403.5 |  |  | 387.1 |  |  | 1,182.6 | 1,119.7
Depreciation and amortization | 232.4 |  |  | 215.3 |  |  | 685.3 | 632.9
Equity in earnings of transmission affiliates | 0.0 |  |  | 0.0 |  |  | 0.0 | 0.0
Interest expense | 160.3 |  |  | 148.7 |  |  | 475.4 | 449.4
Income tax expense (benefit) | 63.3 |  |  | 69.3 |  |  | 172.6 | 188.8
Net income (loss) | 238.1 |  |  | 243.4 |  |  | 637.2 | 686.8
Net income (loss) attributed to common shareholders | 237.8 |  |  | 243.1 |  |  | 636.3 | 685.9
Wisconsin | Operating Segments | Utility operations | External revenues |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |
Operating revenues | 1,590.0 |  |  | 1,622.0 |  |  | 4,737.0 | 5,042.8
Wisconsin | Operating Segments | Utility operations | Intersegment revenues |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |
Operating revenues | 0.0 |  |  | 0.0 |  |  | 0.0 | 0.0
Illinois | Operating Segments |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |
Operating revenues | 173.6 |  |  | 243.3 |  |  | 1,116.4 | 1,116.5
Illinois | Operating Segments | Utility operations |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |
Other operation and maintenance | 126.5 |  |  | 86.5 |  |  | 336.1 | 305.5
Depreciation and amortization | 63.9 |  |  | 59.3 |  |  | 191.1 | 176.3
Equity in earnings of transmission affiliates | 0.0 |  |  | 0.0 |  |  | 0.0 | 0.0
Interest expense | 22.3 |  |  | 22.0 |  |  | 70.8 | 65.0
Income tax expense (benefit) | (19.0) |  |  | 8.9 |  |  | 63.3 | 61.8
Net income (loss) | (48.6) |  |  | 24.7 |  |  | 164.6 | 167.9
Net income (loss) attributed to common shareholders | (48.6) |  |  | 24.7 |  |  | 164.6 | 167.9
Illinois | Operating Segments | Utility operations | External revenues |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |
Operating revenues | 173.6 |  |  | 243.3 |  |  | 1,116.4 | 1,116.5
Illinois | Operating Segments | Utility operations | Intersegment revenues |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |
Operating revenues | 0.0 |  |  | 0.0 |  |  | 0.0 | 0.0
Other States | Operating Segments |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |
Operating revenues | 53.0 |  |  | 47.6 |  |  | 308.6 | 379.5
Other States | Operating Segments | Utility operations |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |
Other operation and maintenance | 22.6 |  |  | 21.7 |  |  | 67.8 | 68.2
Depreciation and amortization | 12.0 |  |  | 11.2 |  |  | 34.9 | 32.2
Equity in earnings of transmission affiliates | 0.0 |  |  | 0.0 |  |  | 0.0 | 0.0
Interest expense | 4.1 |  |  | 3.7 |  |  | 12.1 | 12.0
Income tax expense (benefit) | (1.3) |  |  | (2.0) |  |  | 12.0 | 10.5
Net income (loss) | (3.7) |  |  | (6.0) |  |  | 35.5 | 30.9
Net income (loss) attributed to common shareholders | (3.7) |  |  | (6.0) |  |  | 35.5 | 30.9
Other States | Operating Segments | Utility operations | External revenues |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |
Operating revenues | 53.0 |  |  | 47.6 |  |  | 308.6 | 379.5
Other States | Operating Segments | Utility operations | Intersegment revenues |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |
Operating revenues | 0.0 |  |  | 0.0 |  |  | 0.0 | 0.0
Electric Transmission | Operating Segments |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |
Other operation and maintenance | 0.0 |  |  | 0.0 |  |  | 0.0 | 0.0
Depreciation and amortization | 0.0 |  |  | 0.0 |  |  | 0.0 | 0.0
Equity in earnings of transmission affiliates | 46.7 |  |  | 44.7 |  |  | 138.3 | 132.1
Interest expense | 4.8 |  |  | 5.0 |  |  | 14.5 | 14.6
Income tax expense (benefit) | 10.2 |  |  | 10.0 |  |  | 30.6 | 29.4
Net income (loss) | 31.7 |  |  | 29.7 |  |  | 93.2 | 88.1
Net income (loss) attributed to common shareholders | 31.7 |  |  | 29.7 |  |  | 93.2 | 88.1
Electric Transmission | Operating Segments | External revenues |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |
Operating revenues | 0.0 |  |  | 0.0 |  |  | 0.0 | 0.0
Electric Transmission | Operating Segments | Intersegment revenues |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |
Operating revenues | $ 0.0 |  |  | 0.0 |  |  | $ 0.0 | 0.0
Electric Transmission | ATC |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |
Ownership interest (as a percent) | 60.00% |  |  |  |  |  | 60.00% |
Electric Transmission | ATC Holdco |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |
Ownership interest (as a percent) | 75.00% |  |  |  |  |  | 75.00% |
Non-Utility Energy Infrastructure |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |
Natural gas storage needs provided to Wisconsin utilities |  |  |  |  |  |  | 33.00% |
Non-Utility Energy Infrastructure | Operating Segments |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |
Operating revenues | $ 163.1 |  |  | 159.8 |  |  | $ 509.6 | 495.0
Other operation and maintenance | 19.1 |  |  | 21.5 |  |  | 62.3 | 59.6
Depreciation and amortization | 49.2 |  |  | 48.8 |  |  | 147.9 | 139.9
Equity in earnings of transmission affiliates | 0.0 |  |  | 0.0 |  |  | 0.0 | 0.0
Interest expense | 23.4 |  |  | 24.8 |  |  | 71.6 | 69.8
Income tax expense (benefit) | (16.0) |  |  | (6.7) |  |  | (59.6) | (44.2)
Net income (loss) | 83.2 |  |  | 66.7 |  |  | 269.2 | 240.9
Net income (loss) attributed to common shareholders | 85.0 |  |  | 67.4 |  |  | 272.6 | 241.8
Non-Utility Energy Infrastructure | Operating Segments | External revenues |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |
Operating revenues | 46.9 |  |  | 44.5 |  |  | 153.7 | 136.6
Non-Utility Energy Infrastructure | Operating Segments | Intersegment revenues |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |
Operating revenues | 116.2 |  |  | 115.3 |  |  | 355.9 | 358.4
Corporate and Other | Operating Segments |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |
Operating revenues | 0.0 |  |  | 0.0 |  |  | 0.0 | 0.1
Other operation and maintenance | (3.3) |  |  | 1.3 |  |  | (10.7) | 0.6
Depreciation and amortization | 5.6 |  |  | 5.3 |  |  | 16.6 | 15.6
Equity in earnings of transmission affiliates | 0.0 |  |  | 0.0 |  |  | 0.0 | 0.0
Interest expense | 79.0 |  |  | 66.3 |  |  | 222.1 | 183.9
Income tax expense (benefit) | (5.6) |  |  | (19.1) |  |  | (58.0) | (63.3)
Net income (loss) | (62.1) |  |  | (42.9) |  |  | (128.5) | (101.4)
Net income (loss) attributed to common shareholders | (62.1) |  |  | (42.9) |  |  | (128.5) | (101.4)
Corporate and Other | Operating Segments | External revenues |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |
Operating revenues | 0.0 |  |  | 0.0 |  |  | 0.0 | 0.1
Corporate and Other | Operating Segments | Intersegment revenues |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |
Operating revenues | $ 0.0 |  |  | $ 0.0 |  |  | $ 0.0 | $ 0.0

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