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OPERATING REVENUES - DISAGGREGATION OF OPERATING REVENUES BY SEGMENT (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Disaggregation of Operating Revenues |  |  |  |
Total operating revenues | $ 1,772.0 | $ 1,830.0 | $ 4,452.2 | $ 4,718.1
Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,743.4 | 1,810.0 | 4,347.9 | 4,668.2
Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | 28.6 | 20.0 | 104.3 | 49.9
Utility operations | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,683.1 | 1,755.8 | 4,232.1 | 4,566.9
Electric | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,148.5 | 1,178.5 | 2,333.8 | 2,382.3
Natural gas | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 534.6 | 577.3 | 1,898.3 | 2,184.6
Other non-utility revenues | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 60.3 | 54.2 | 115.8 | 101.3
Reconciling Eliminations |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Total operating revenues | (119.6) | (119.0) | (239.7) | (243.1)
Reconciling Eliminations | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | (14.7) | (17.4) | (30.5) | (40.1)
Reconciling Eliminations | Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | (104.9) | (101.6) | (209.2) | (203.0)
Reconciling Eliminations | Utility operations | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | (10.8) | (13.6) | (25.0) | (34.7)
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 | (10.8) | (13.6) | (25.0) | (34.7)
Reconciling Eliminations | Other non-utility revenues | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | (3.9) | (3.8) | (5.5) | (5.4)
Total Utility Operations | Natural gas | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 534.0 | 576.8 | 1,897.4 | 2,183.9
Total Utility Operations | Operating Segments |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Total operating revenues | 1,716.0 | 1,779.9 | 4,345.4 | 4,625.9
Total Utility Operations | Operating Segments | Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | 28.6 | 19.9 | 104.3 | 49.8
Total Utility Operations | Operating Segments | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,687.4 | 1,760.0 | 4,241.1 | 4,576.1
Total Utility Operations | Operating Segments | Utility operations | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,682.5 | 1,755.3 | 4,231.2 | 4,566.2
Total Utility Operations | Operating Segments | Electric | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,148.5 | 1,178.5 | 2,333.8 | 2,382.3
Total Utility Operations | Operating Segments | Natural gas | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 534.0 | 576.8 | 1,897.4 | 2,183.9
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 | 4.7 | 9.9 | 9.9
Wisconsin | Electric | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,148.5 | 1,178.5 | 2,333.8 | 2,382.3
Wisconsin | Natural gas | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 215.1 | 239.9 | 801.1 | 1,024.3
Wisconsin | Operating Segments |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Total operating revenues | 1,368.2 | 1,424.5 | 3,147.0 | 3,420.8
Wisconsin | Operating Segments | Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | 4.6 | 6.1 | 12.1 | 14.2
Wisconsin | Operating Segments | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,363.6 | 1,418.4 | 3,134.9 | 3,406.6
Wisconsin | Operating Segments | Utility operations | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,363.6 | 1,418.4 | 3,134.9 | 3,406.6
Wisconsin | Operating Segments | Electric | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,148.5 | 1,178.5 | 2,333.8 | 2,382.3
Wisconsin | Operating Segments | Natural gas | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 215.1 | 239.9 | 801.1 | 1,024.3
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 | 255.5 | 260.0 | 859.3 | 837.7
Illinois | Operating Segments |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Total operating revenues | 276.8 | 273.5 | 942.8 | 873.2
Illinois | Operating Segments | Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | 21.3 | 13.5 | 83.5 | 35.5
Illinois | Operating Segments | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 255.5 | 260.0 | 859.3 | 837.7
Illinois | Operating Segments | Utility operations | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 255.5 | 260.0 | 859.3 | 837.7
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 | 255.5 | 260.0 | 859.3 | 837.7
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 | 63.4 | 76.9 | 237.0 | 321.9
Other States | Operating Segments |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Total operating revenues | 71.0 | 81.9 | 255.6 | 331.9
Other States | Operating Segments | Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | 2.7 | 0.3 | 8.7 | 0.1
Other States | Operating Segments | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 68.3 | 81.6 | 246.9 | 331.8
Other States | Operating Segments | Utility operations | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 63.4 | 76.9 | 237.0 | 321.9
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 | 63.4 | 76.9 | 237.0 | 321.9
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 | 4.7 | 9.9 | 9.9
Non-Utility Energy Infrastructure | Operating Segments |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Total operating revenues | 175.6 | 169.0 | 346.5 | 335.2
Non-Utility Energy Infrastructure | Operating Segments | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 70.7 | 67.4 | 137.3 | 132.2
Non-Utility Energy Infrastructure | Operating Segments | Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | 104.9 | 101.6 | 209.2 | 203.0
Non-Utility Energy Infrastructure | Operating Segments | Utility operations | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 11.4 | 14.1 | 25.9 | 35.4
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 | 11.4 | 14.1 | 25.9 | 35.4
Non-Utility Energy Infrastructure | Operating Segments | Other non-utility revenues | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 59.3 | 53.3 | 111.4 | 96.8
Corporate and Other | Operating Segments |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Total operating revenues | 0.0 | 0.1 | 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 | 0.1 | 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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