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OPERATING REVENUES - DISAGGREGATION OF OPERATING REVENUES BY SEGMENT (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Disaggregation of Operating Revenues |  |  |  |
Total operating revenues | $ 1,863.5 | $ 1,957.4 | $ 6,315.7 | $ 6,675.5
Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,854.3 | 1,944.0 | 6,202.2 | 6,612.2
Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | 9.2 | 13.4 | 113.5 | 63.3
Utility operations | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,803.1 | 1,895.2 | 6,035.2 | 6,462.1
Electric | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,422.2 | 1,457.8 | 3,756.0 | 3,840.1
Natural gas | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 380.9 | 437.4 | 2,279.2 | 2,622.0
Other non-utility revenues | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 51.2 | 48.8 | 167.0 | 150.1
Reconciling Eliminations |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Total operating revenues | (116.2) | (115.3) | (355.9) | (358.4)
Reconciling Eliminations | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | (11.2) | (14.0) | (41.7) | (54.1)
Reconciling Eliminations | Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | (105.0) | (101.3) | (314.2) | (304.3)
Reconciling Eliminations | Utility operations | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | (9.6) | (12.3) | (34.6) | (47.0)
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 | (9.6) | (12.3) | (34.6) | (47.0)
Reconciling Eliminations | Other non-utility revenues | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | (1.6) | (1.7) | (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 | 380.1 | 436.8 | 2,277.5 | 2,620.7
Total Utility Operations | Operating Segments |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Total operating revenues | 1,816.6 | 1,912.9 | 6,162.0 | 6,538.8
Total Utility Operations | Operating Segments | Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | 9.2 | 13.4 | 113.5 | 63.2
Total Utility Operations | Operating Segments | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,807.4 | 1,899.5 | 6,048.5 | 6,475.6
Total Utility Operations | Operating Segments | Utility operations | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,802.3 | 1,894.6 | 6,033.5 | 6,460.8
Total Utility Operations | Operating Segments | Electric | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,422.2 | 1,457.8 | 3,756.0 | 3,840.1
Total Utility Operations | Operating Segments | Natural gas | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 380.1 | 436.8 | 2,277.5 | 2,620.7
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 | 5.1 | 4.9 | 15.0 | 14.8
Wisconsin | Electric | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,422.2 | 1,457.8 | 3,756.0 | 3,840.1
Wisconsin | Natural gas | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 163.7 | 159.5 | 964.8 | 1,183.8
Wisconsin | Operating Segments |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Total operating revenues | 1,590.0 | 1,622.0 | 4,737.0 | 5,042.8
Wisconsin | Operating Segments | Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | 4.1 | 4.7 | 16.2 | 18.9
Wisconsin | Operating Segments | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,585.9 | 1,617.3 | 4,720.8 | 5,023.9
Wisconsin | Operating Segments | Utility operations | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,585.9 | 1,617.3 | 4,720.8 | 5,023.9
Wisconsin | Operating Segments | Electric | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,422.2 | 1,457.8 | 3,756.0 | 3,840.1
Wisconsin | Operating Segments | Natural gas | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 163.7 | 159.5 | 964.8 | 1,183.8
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 | 168.0 | 234.8 | 1,027.3 | 1,072.5
Illinois | Operating Segments |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Total operating revenues | 173.6 | 243.3 | 1,116.4 | 1,116.5
Illinois | Operating Segments | Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | 5.6 | 8.5 | 89.1 | 44.0
Illinois | Operating Segments | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 168.0 | 234.8 | 1,027.3 | 1,072.5
Illinois | Operating Segments | Utility operations | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 168.0 | 234.8 | 1,027.3 | 1,072.5
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 | 168.0 | 234.8 | 1,027.3 | 1,072.5
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 | 48.4 | 42.5 | 285.4 | 364.4
Other States | Operating Segments |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Total operating revenues | 53.0 | 47.6 | 308.6 | 379.5
Other States | Operating Segments | Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | (0.5) | 0.2 | 8.2 | 0.3
Other States | Operating Segments | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 53.5 | 47.4 | 300.4 | 379.2
Other States | Operating Segments | Utility operations | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 48.4 | 42.5 | 285.4 | 364.4
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 | 48.4 | 42.5 | 285.4 | 364.4
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 | 5.1 | 4.9 | 15.0 | 14.8
Non-Utility Energy Infrastructure | Operating Segments |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Total operating revenues | 163.1 | 159.8 | 509.6 | 495.0
Non-Utility Energy Infrastructure | Operating Segments | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 58.1 | 58.5 | 195.4 | 190.7
Non-Utility Energy Infrastructure | Operating Segments | Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | 105.0 | 101.3 | 314.2 | 304.3
Non-Utility Energy Infrastructure | Operating Segments | Utility operations | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 10.4 | 12.9 | 36.3 | 48.3
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 | 10.4 | 12.9 | 36.3 | 48.3
Non-Utility Energy Infrastructure | Operating Segments | Other non-utility revenues | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 47.7 | 45.6 | 159.1 | 142.4
Corporate and Other | Operating Segments |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Total operating revenues | 0.0 | 0.0 | 0.0 | 0.1
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 | 0.0 | 0.0 | 0.1
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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