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SEGMENT INFORMATION (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 USD ($) | Jun. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) | Sep. 30, 2022 USD ($) | Jun. 30, 2022 USD ($) | Mar. 31, 2022 USD ($) | Sep. 30, 2023 USD ($) segment | Sep. 30, 2022 USD ($)
Segment information |  |  |  |  |  |  |  |
Number of reportable segments | segment |  |  |  |  |  |  | 6 |
Operating revenues | $ 1,957.4 |  |  | $ 2,003.0 |  |  | $ 6,675.5 | $ 7,039.0
Other operation and maintenance | 516.6 |  |  | 454.3 |  |  | 1,546.6 | 1,357.7
Depreciation and amortization | 320.3 |  |  | 280.3 |  |  | 939.7 | 838.0
Equity in earnings of transmission affiliates | 44.7 |  |  | 63.7 |  |  | 132.1 | 148.4
Interest expense | 182.5 |  |  | 127.5 |  |  | 533.4 | 364.9
Income tax expense (benefit) | 60.4 |  |  | 73.4 |  |  | 183.0 | 263.9
Net income (loss) | 315.6 |  |  | 301.7 |  |  | 1,113.2 | 1,157.5
Net income (loss) attributed to common shareholders | 316.0 | $ 289.7 | $ 507.5 | 302.0 | $ 287.5 | $ 565.9 | 1,113.2 | 1,155.4
External revenues |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |
Operating revenues | 1,957.4 |  |  | 2,003.0 |  |  | 6,675.5 | 7,039.0
Intersegment revenues |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |
Operating revenues | 0.0 |  |  | 0.0 |  |  | 0.0 | 0.0
Utility operations |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |
Other operation and maintenance | 495.3 |  |  | 450.3 |  |  | 1,493.4 | 1,341.0
Depreciation and amortization | 285.8 |  |  | 257.4 |  |  | 841.4 | 766.6
Equity in earnings of transmission affiliates | 0.0 |  |  | 0.0 |  |  | 0.0 | 0.0
Interest expense | 174.4 |  |  | 158.6 |  |  | 526.4 | 472.7
Income tax expense (benefit) | 76.2 |  |  | 67.6 |  |  | 261.1 | 286.9
Net income (loss) | 262.1 |  |  | 204.0 |  |  | 885.6 | 845.1
Net income (loss) attributed to common shareholders | 261.8 |  |  | 203.7 |  |  | 884.7 | 844.2
Utility operations | External revenues |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |
Operating revenues | 1,912.9 |  |  | 1,976.3 |  |  | 6,538.8 | 6,941.3
Utility operations | Intersegment revenues |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |
Operating revenues | 0.0 |  |  | 0.0 |  |  | 0.0 | 0.0
Reconciling eliminations |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |
Other operation and maintenance | (1.5) |  |  | (1.6) |  |  | (7.0) | (7.1)
Depreciation and amortization | (19.6) |  |  | (17.3) |  |  | (57.2) | (50.4)
Equity in earnings of transmission affiliates | 0.0 |  |  | 0.0 |  |  | 0.0 | 0.0
Interest expense | (88.0) |  |  | (83.9) |  |  | (261.3) | (252.1)
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 | $ (115.3) |  |  | (113.3) |  |  | $ (358.4) | (345.7)
ATC |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |
Ownership interest (as a percent) | 60.00% |  |  |  |  |  | 60.00% |
Equity in earnings of transmission affiliates | $ 44.2 |  |  | 63.2 |  |  | $ 130.2 | 146.8
ATC Holdco |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |
Ownership interest (as a percent) | 75.00% |  |  |  |  |  | 75.00% |
Equity in earnings of transmission affiliates | $ 0.5 |  |  | 0.5 |  |  | $ 1.9 | 1.6
Wisconsin | Operating Segments |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |
Operating revenues | 1,622.0 |  |  | 1,676.8 |  |  | 5,042.8 | 5,176.5
Wisconsin | Operating Segments | Utility operations |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |
Other operation and maintenance | 387.1 |  |  | 329.1 |  |  | 1,119.7 | 979.6
Depreciation and amortization | 215.3 |  |  | 189.2 |  |  | 632.9 | 564.0
Equity in earnings of transmission affiliates | 0.0 |  |  | 0.0 |  |  | 0.0 | 0.0
Interest expense | 148.7 |  |  | 137.2 |  |  | 449.4 | 409.1
Income tax expense (benefit) | 69.3 |  |  | 63.7 |  |  | 188.8 | 208.4
Net income (loss) | 243.4 |  |  | 195.2 |  |  | 686.8 | 632.3
Net income (loss) attributed to common shareholders | 243.1 |  |  | 194.9 |  |  | 685.9 | 631.4
Wisconsin | Operating Segments | Utility operations | External revenues |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |
Operating revenues | 1,622.0 |  |  | 1,676.8 |  |  | 5,042.8 | 5,176.5
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 | 243.3 |  |  | 230.3 |  |  | 1,116.5 | 1,354.8
Illinois | Operating Segments | Utility operations |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |
Other operation and maintenance | 86.5 |  |  | 100.2 |  |  | 305.5 | 292.9
Depreciation and amortization | 59.3 |  |  | 57.9 |  |  | 176.3 | 172.1
Equity in earnings of transmission affiliates | 0.0 |  |  | 0.0 |  |  | 0.0 | 0.0
Interest expense | 22.0 |  |  | 18.1 |  |  | 65.0 | 53.8
Income tax expense (benefit) | 8.9 |  |  | 5.8 |  |  | 61.8 | 69.1
Net income (loss) | 24.7 |  |  | 14.9 |  |  | 167.9 | 184.7
Net income (loss) attributed to common shareholders | 24.7 |  |  | 14.9 |  |  | 167.9 | 184.7
Illinois | Operating Segments | Utility operations | External revenues |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |
Operating revenues | 243.3 |  |  | 230.3 |  |  | 1,116.5 | 1,354.8
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 | 47.6 |  |  | 69.2 |  |  | 379.5 | 410.0
Other States | Operating Segments | Utility operations |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |
Other operation and maintenance | 21.7 |  |  | 21.0 |  |  | 68.2 | 68.5
Depreciation and amortization | 11.2 |  |  | 10.3 |  |  | 32.2 | 30.5
Equity in earnings of transmission affiliates | 0.0 |  |  | 0.0 |  |  | 0.0 | 0.0
Interest expense | 3.7 |  |  | 3.3 |  |  | 12.0 | 9.8
Income tax expense (benefit) | (2.0) |  |  | (1.9) |  |  | 10.5 | 9.4
Net income (loss) | (6.0) |  |  | (6.1) |  |  | 30.9 | 28.1
Net income (loss) attributed to common shareholders | (6.0) |  |  | (6.1) |  |  | 30.9 | 28.1
Other States | Operating Segments | Utility operations | External revenues |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |
Operating revenues | 47.6 |  |  | 69.2 |  |  | 379.5 | 410.0
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 | 44.7 |  |  | 63.7 |  |  | 132.1 | 148.4
Interest expense | 5.0 |  |  | 4.9 |  |  | 14.6 | 14.6
Income tax expense (benefit) | 10.0 |  |  | 14.3 |  |  | 29.4 | 32.5
Net income (loss) | 29.7 |  |  | 44.5 |  |  | 88.1 | 101.3
Net income (loss) attributed to common shareholders | 29.7 |  |  | 44.5 |  |  | 88.1 | 101.3
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 | $ 159.8 |  |  | 139.9 |  |  | $ 495.0 | 443.0
Other operation and maintenance | 21.5 |  |  | 12.1 |  |  | 59.6 | 36.9
Depreciation and amortization | 48.8 |  |  | 34.0 |  |  | 139.9 | 102.3
Equity in earnings of transmission affiliates | 0.0 |  |  | 0.0 |  |  | 0.0 | 0.0
Interest expense | 24.8 |  |  | 17.0 |  |  | 69.8 | 51.6
Income tax expense (benefit) | (6.7) |  |  | 1.7 |  |  | (44.2) | (10.5)
Net income (loss) | 66.7 |  |  | 70.4 |  |  | 240.9 | 244.0
Net income (loss) attributed to common shareholders | 67.4 |  |  | 71.0 |  |  | 241.8 | 242.8
Non-Utility Energy Infrastructure | Operating Segments | External revenues |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |
Operating revenues | 44.5 |  |  | 26.6 |  |  | 136.6 | 97.3
Non-Utility Energy Infrastructure | Operating Segments | Intersegment revenues |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |
Operating revenues | 115.3 |  |  | 113.3 |  |  | 358.4 | 345.7
Corporate and Other | Operating Segments |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |
Operating revenues | 0.0 |  |  | 0.1 |  |  | 0.1 | 0.4
Other operation and maintenance | 1.3 |  |  | (6.5) |  |  | 0.6 | (13.1)
Depreciation and amortization | 5.3 |  |  | 6.2 |  |  | 15.6 | 19.5
Equity in earnings of transmission affiliates | 0.0 |  |  | 0.0 |  |  | 0.0 | 0.0
Interest expense | 66.3 |  |  | 30.9 |  |  | 183.9 | 78.1
Income tax expense (benefit) | (19.1) |  |  | (10.2) |  |  | (63.3) | (45.0)
Net income (loss) | (42.9) |  |  | (17.2) |  |  | (101.4) | (32.9)
Net income (loss) attributed to common shareholders | (42.9) |  |  | (17.2) |  |  | (101.4) | (32.9)
Corporate and Other | Operating Segments | External revenues |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |
Operating revenues | 0.0 |  |  | 0.1 |  |  | 0.1 | 0.4
Corporate and Other | Operating Segments | Intersegment revenues |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |
Operating revenues | $ 0.0 |  |  | $ 0.0 |  |  | $ 0.0 | $ 0.0

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