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OPERATING REVENUES - DISAGGREGATION OF OPERATING REVENUES BY SEGMENT (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Disaggregation of Operating Revenues |  |  |  |
Total operating revenues | $ 1,957.4 | $ 2,003.0 | $ 6,675.5 | $ 7,039.0
Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,944.0 | 1,991.1 | 6,612.2 | 7,011.9
Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | 13.4 | 11.9 | 63.3 | 27.1
Utility Operations | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,895.2 | 1,960.5 | 6,462.1 | 6,903.0
Electric | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,457.8 | 1,436.9 | 3,840.1 | 3,845.5
Natural gas | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 437.4 | 523.6 | 2,622.0 | 3,057.5
Other non-utility revenues | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 48.8 | 30.6 | 150.1 | 108.9
Reconciling Eliminations |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Total operating revenues | (115.3) | (113.3) | (358.4) | (345.7)
Reconciling Eliminations | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | (14.0) | (12.8) | (54.1) | (44.2)
Reconciling Eliminations | Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | (101.3) | (100.5) | (304.3) | (301.5)
Reconciling Eliminations | Utility Operations | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | (12.3) | (11.3) | (47.0) | (37.1)
Reconciling Eliminations | Electric | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 0.0 | 0.0 | 0.0 | 0.0
Reconciling Eliminations | Natural gas | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | (12.3) | (11.3) | (47.0) | (37.1)
Reconciling Eliminations | Other non-utility revenues | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | (1.7) | (1.5) | (7.1) | (7.1)
Total Utility Operations | Natural gas | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 436.8 | 522.8 | 2,620.7 | 3,055.2
Total Utility Operations | Operating Segments |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Total operating revenues | 1,912.9 | 1,976.3 | 6,538.8 | 6,941.3
Total Utility Operations | Operating Segments | Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | 13.4 | 11.8 | 63.2 | 26.7
Total Utility Operations | Operating Segments | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,899.5 | 1,964.5 | 6,475.6 | 6,914.6
Total Utility Operations | Operating Segments | Utility Operations | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,894.6 | 1,959.7 | 6,460.8 | 6,900.7
Total Utility Operations | Operating Segments | Electric | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,457.8 | 1,436.9 | 3,840.1 | 3,845.5
Total Utility Operations | Operating Segments | Natural gas | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 436.8 | 522.8 | 2,620.7 | 3,055.2
Total Utility Operations | Operating Segments | Other non-utility revenues | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 4.9 | 4.8 | 14.8 | 13.9
Wisconsin | Electric | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,457.8 | 1,436.9 | 3,840.1 | 3,845.5
Wisconsin | Natural gas | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 159.5 | 234.9 | 1,183.8 | 1,311.2
Wisconsin | Operating Segments |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Total operating revenues | 1,622.0 | 1,676.8 | 5,042.8 | 5,176.5
Wisconsin | Operating Segments | Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | 4.7 | 5.0 | 18.9 | 19.8
Wisconsin | Operating Segments | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,617.3 | 1,671.8 | 5,023.9 | 5,156.7
Wisconsin | Operating Segments | Utility Operations | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,617.3 | 1,671.8 | 5,023.9 | 5,156.7
Wisconsin | Operating Segments | Electric | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,457.8 | 1,436.9 | 3,840.1 | 3,845.5
Wisconsin | Operating Segments | Natural gas | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 159.5 | 234.9 | 1,183.8 | 1,311.2
Wisconsin | Operating Segments | Other non-utility revenues | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 0.0 | 0.0 | 0.0 | 0.0
Illinois | Natural gas | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 234.8 | 224.0 | 1,072.5 | 1,346.1
Illinois | Operating Segments |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Total operating revenues | 243.3 | 230.3 | 1,116.5 | 1,354.8
Illinois | Operating Segments | Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | 8.5 | 6.3 | 44.0 | 8.7
Illinois | Operating Segments | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 234.8 | 224.0 | 1,072.5 | 1,346.1
Illinois | Operating Segments | Utility Operations | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 234.8 | 224.0 | 1,072.5 | 1,346.1
Illinois | Operating Segments | Electric | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 0.0 | 0.0 | 0.0 | 0.0
Illinois | Operating Segments | Natural gas | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 234.8 | 224.0 | 1,072.5 | 1,346.1
Illinois | Operating Segments | Other non-utility revenues | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 0.0 | 0.0 | 0.0 | 0.0
Other States | Natural gas | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 42.5 | 63.9 | 364.4 | 397.9
Other States | Operating Segments |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Total operating revenues | 47.6 | 69.2 | 379.5 | 410.0
Other States | Operating Segments | Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | 0.2 | 0.5 | 0.3 | (1.8)
Other States | Operating Segments | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 47.4 | 68.7 | 379.2 | 411.8
Other States | Operating Segments | Utility Operations | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 42.5 | 63.9 | 364.4 | 397.9
Other States | Operating Segments | Electric | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 0.0 | 0.0 | 0.0 | 0.0
Other States | Operating Segments | Natural gas | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 42.5 | 63.9 | 364.4 | 397.9
Other States | Operating Segments | Other non-utility revenues | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 4.9 | 4.8 | 14.8 | 13.9
Non-Utility Energy Infrastructure | Operating Segments |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Total operating revenues | 159.8 | 139.9 | 495.0 | 443.0
Non-Utility Energy Infrastructure | Operating Segments | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 58.5 | 39.4 | 190.7 | 141.5
Non-Utility Energy Infrastructure | Operating Segments | Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | 101.3 | 100.5 | 304.3 | 301.5
Non-Utility Energy Infrastructure | Operating Segments | Utility Operations | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 12.9 | 12.1 | 48.3 | 39.4
Non-Utility Energy Infrastructure | Operating Segments | Electric | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 0.0 | 0.0 | 0.0 | 0.0
Non-Utility Energy Infrastructure | Operating Segments | Natural gas | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 12.9 | 12.1 | 48.3 | 39.4
Non-Utility Energy Infrastructure | Operating Segments | Other non-utility revenues | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 45.6 | 27.3 | 142.4 | 102.1
Corporate and Other | Operating Segments |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Total operating revenues | 0.0 | 0.1 | 0.1 | 0.4
Corporate and Other | Operating Segments | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 0.0 | 0.0 | 0.0 | 0.0
Corporate and Other | Operating Segments | Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | 0.0 | 0.1 | 0.1 | 0.4
Corporate and Other | Operating Segments | Utility Operations | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 0.0 | 0.0 | 0.0 | 0.0
Corporate and Other | Operating Segments | Electric | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 0.0 | 0.0 | 0.0 | 0.0
Corporate and Other | Operating Segments | Natural gas | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 0.0 | 0.0 | 0.0 | 0.0
Corporate and Other | Operating Segments | Other non-utility revenues | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0

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