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OPERATING REVENUES - DISAGGREGATION OF OPERATING REVENUES BY SEGMENT (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Disaggregation of Operating Revenues |  |  |  |
Total operating revenues | $ 1,830.0 | $ 2,127.9 | $ 4,718.1 | $ 5,036.0
Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,810.0 | 2,121.2 | 4,668.2 | 5,020.8
Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | 20.0 | 6.7 | 49.9 | 15.2
Utility Operations | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,755.8 | 2,089.6 | 4,566.9 | 4,942.5
Electric | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,178.5 | 1,221.1 | 2,382.3 | 2,408.6
Natural gas | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 577.3 | 868.5 | 2,184.6 | 2,533.9
Other non-utility revenues | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 54.2 | 31.6 | 101.3 | 78.3
Reconciling Eliminations |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Total operating revenues | (119.0) | (115.5) | (243.1) | (232.4)
Reconciling Eliminations | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | (17.4) | (15.0) | (40.1) | (31.4)
Reconciling Eliminations | Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | (101.6) | (100.5) | (203.0) | (201.0)
Reconciling Eliminations | Utility Operations | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | (13.6) | (11.0) | (34.7) | (25.8)
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 | (13.6) | (11.0) | (34.7) | (25.8)
Reconciling Eliminations | Other non-utility revenues | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | (3.8) | (4.0) | (5.4) | (5.6)
Total Utility Operations |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Total operating revenues | 1,779.9 | 2,099.7 | 4,625.9 | 4,965.0
Total Utility Operations | Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | 19.9 | 6.6 | 49.8 | 14.9
Total Utility Operations | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,760.0 | 2,093.1 | 4,576.1 | 4,950.1
Total Utility Operations | Utility Operations | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,755.3 | 2,088.6 | 4,566.2 | 4,941.0
Total Utility Operations | Electric | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,178.5 | 1,221.1 | 2,382.3 | 2,408.6
Total Utility Operations | Natural gas | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 576.8 | 867.5 | 2,183.9 | 2,532.4
Total Utility Operations | Other non-utility revenues | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 4.7 | 4.5 | 9.9 | 9.1
Wisconsin |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Total operating revenues | 1,424.5 | 1,557.4 | 3,420.8 | 3,499.7
Wisconsin | Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | 6.1 | 6.8 | 14.2 | 14.8
Wisconsin | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,418.4 | 1,550.6 | 3,406.6 | 3,484.9
Wisconsin | Utility Operations | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,418.4 | 1,550.6 | 3,406.6 | 3,484.9
Wisconsin | Electric | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,178.5 | 1,221.1 | 2,382.3 | 2,408.6
Wisconsin | Natural gas | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 239.9 | 329.5 | 1,024.3 | 1,076.3
Wisconsin | 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 |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Total operating revenues | 273.5 | 442.4 | 873.2 | 1,124.5
Illinois | Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | 13.5 | 0.2 | 35.5 | 2.4
Illinois | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 260.0 | 442.2 | 837.7 | 1,122.1
Illinois | Utility Operations | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 260.0 | 442.2 | 837.7 | 1,122.1
Illinois | 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 | Natural gas | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 260.0 | 442.2 | 837.7 | 1,122.1
Illinois | 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 |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Total operating revenues | 81.9 | 99.9 | 331.9 | 340.8
Other States | Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | 0.3 | (0.4) | 0.1 | (2.3)
Other States | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 81.6 | 100.3 | 331.8 | 343.1
Other States | Utility Operations | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 76.9 | 95.8 | 321.9 | 334.0
Other States | 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 | Natural gas | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 76.9 | 95.8 | 321.9 | 334.0
Other States | Other non-utility revenues | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 4.7 | 4.5 | 9.9 | 9.1
Non-Utility Energy Infrastructure |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Total operating revenues | 169.0 | 143.6 | 335.2 | 303.1
Non-Utility Energy Infrastructure | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 67.4 | 43.1 | 132.2 | 102.1
Non-Utility Energy Infrastructure | Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | 101.6 | 100.5 | 203.0 | 201.0
Non-Utility Energy Infrastructure | Utility Operations | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 14.1 | 12.0 | 35.4 | 27.3
Non-Utility Energy Infrastructure | 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 | Natural gas | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 14.1 | 12.0 | 35.4 | 27.3
Non-Utility Energy Infrastructure | Other non-utility revenues | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 53.3 | 31.1 | 96.8 | 74.8
Corporate and Other |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Total operating revenues | 0.1 | 0.1 | 0.1 | 0.3
Corporate and Other | 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 | Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | 0.1 | 0.1 | 0.1 | 0.3
Corporate and Other | 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 | 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 | 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 | 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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