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OPERATING REVENUES - DISAGGREGATION OF OPERATING REVENUES BY SEGMENT (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Disaggregation of Operating Revenues |  |  |  |
Total operating revenues | $ 2,003.0 | $ 1,746.5 | $ 7,039.0 | $ 6,114.1
Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,991.1 | 1,733.0 | 7,011.9 | 6,056.3
Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | 11.9 | 13.5 | 27.1 | 57.8
Total regulated revenues | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,960.5 | 1,710.6 | 6,903.0 | 5,982.9
Electric | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,436.9 | 1,284.6 | 3,845.5 | 3,462.8
Natural gas | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 523.6 | 426.0 | 3,057.5 | 2,520.1
Other non-utility revenues | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 30.6 | 22.4 | 108.9 | 73.4
Reconciling Eliminations |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Total operating revenues | (113.3) | (110.8) | (345.7) | (338.0)
Reconciling Eliminations | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | (12.8) | (10.7) | (44.2) | (38.2)
Reconciling Eliminations | Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | (100.5) | (100.1) | (301.5) | (299.8)
Reconciling Eliminations | Total regulated revenues | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | (11.3) | (9.1) | (37.1) | (31.1)
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 | (11.3) | (9.1) | (37.1) | (31.1)
Reconciling Eliminations | Other non-utility revenues | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | (1.5) | (1.6) | (7.1) | (7.1)
Total Utility Operations |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Total operating revenues | 1,976.3 | 1,727.6 | 6,941.3 | 6,051.1
Total Utility Operations | Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | 11.8 | 13.3 | 26.7 | 57.4
Total Utility Operations | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,964.5 | 1,714.3 | 6,914.6 | 5,993.7
Total Utility Operations | Total regulated revenues | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,959.7 | 1,710.0 | 6,900.7 | 5,980.3
Total Utility Operations | Electric | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,436.9 | 1,284.6 | 3,845.5 | 3,462.8
Total Utility Operations | Natural gas | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 522.8 | 425.4 | 3,055.2 | 2,517.5
Total Utility Operations | Other non-utility revenues | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 4.8 | 4.3 | 13.9 | 13.4
Wisconsin |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Total operating revenues | 1,676.8 | 1,458.6 | 5,176.5 | 4,497.8
Wisconsin | Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | 5.0 | 5.0 | 19.8 | 26.0
Wisconsin | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,671.8 | 1,453.6 | 5,156.7 | 4,471.8
Wisconsin | Total regulated revenues | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,671.8 | 1,453.6 | 5,156.7 | 4,471.8
Wisconsin | Electric | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,436.9 | 1,284.6 | 3,845.5 | 3,462.8
Wisconsin | Natural gas | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 234.9 | 169.0 | 1,311.2 | 1,009.0
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 | 230.3 | 216.2 | 1,354.8 | 1,195.1
Illinois | Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | 6.3 | 7.9 | 8.7 | 27.2
Illinois | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 224.0 | 208.3 | 1,346.1 | 1,167.9
Illinois | Total regulated revenues | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 224.0 | 208.3 | 1,346.1 | 1,167.9
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 | 224.0 | 208.3 | 1,346.1 | 1,167.9
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 | 69.2 | 52.8 | 410.0 | 358.2
Other States | Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | 0.5 | 0.4 | (1.8) | 4.2
Other States | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 68.7 | 52.4 | 411.8 | 354.0
Other States | Total regulated revenues | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 63.9 | 48.1 | 397.9 | 340.6
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 | 63.9 | 48.1 | 397.9 | 340.6
Other States | Other non-utility revenues | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 4.8 | 4.3 | 13.9 | 13.4
Non-Utility Energy Infrastructure |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Total operating revenues | 139.9 | 129.5 | 443.0 | 400.6
Non-Utility Energy Infrastructure | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 39.4 | 29.4 | 141.5 | 100.8
Non-Utility Energy Infrastructure | Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | 100.5 | 100.1 | 301.5 | 299.8
Non-Utility Energy Infrastructure | Total regulated revenues | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 12.1 | 9.7 | 39.4 | 33.7
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 | 12.1 | 9.7 | 39.4 | 33.7
Non-Utility Energy Infrastructure | Other non-utility revenues | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 27.3 | 19.7 | 102.1 | 67.1
Corporate and Other |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Total operating revenues | 0.1 | 0.2 | 0.4 | 0.4
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 | 0.2 | 0.4 | 0.4
Corporate and Other | Total regulated revenues | 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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