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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, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Disaggregation of Operating Revenues |  |  |  |
Total operating revenues | $ 2,062.1 | $ 2,009.5 | $ 5,496.3 | $ 5,159.0
Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 2,010.8 | 1,997.6 | 5,381.7 | 5,100.8
Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | 51.3 | 11.9 | 114.6 | 58.2
Utility operations | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,926.4 | 1,938.0 | 5,217.6 | 4,975.8
Electric | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,345.9 | 1,303.1 | 2,779.2 | 2,623.1
Natural gas | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 580.5 | 634.9 | 2,438.4 | 2,352.7
Other non-utility revenues | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 84.4 | 59.6 | 164.1 | 125.0
Reconciling Eliminations |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Total operating revenues | (121.5) | (120.0) | (243.3) | (240.1)
Reconciling Eliminations | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | (13.9) | (14.5) | (28.6) | (29.5)
Reconciling Eliminations | Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | (107.6) | (105.5) | (214.7) | (210.6)
Reconciling Eliminations | Utility operations | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | (10.0) | (10.6) | (23.1) | (24.0)
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 | (10.0) | (10.6) | (23.1) | (24.0)
Reconciling Eliminations | Other non-utility revenues | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | (3.9) | (3.9) | (5.5) | (5.5)
Total Utility Operations | Natural gas | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 580.0 | 634.1 | 2,437.8 | 2,351.2
Total Utility Operations | Operating Segments |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Total operating revenues | 1,968.0 | 1,940.1 | 5,313.3 | 5,015.4
Total Utility Operations | Operating Segments | Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | 36.7 | (2.5) | 85.3 | 30.2
Total Utility Operations | Operating Segments | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,931.3 | 1,942.6 | 5,228.0 | 4,985.2
Total Utility Operations | Operating Segments | Utility operations | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,925.9 | 1,937.2 | 5,217.0 | 4,974.3
Total Utility Operations | Operating Segments | Electric | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,345.9 | 1,303.1 | 2,779.2 | 2,623.1
Total Utility Operations | Operating Segments | Natural gas | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 580.0 | 634.1 | 2,437.8 | 2,351.2
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 | 5.4 | 5.4 | 11.0 | 10.9
Wisconsin | Electric | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,345.9 | 1,303.1 | 2,779.2 | 2,623.1
Wisconsin | Natural gas | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 258.7 | 277.1 | 1,151.0 | 1,011.2
Wisconsin | Operating Segments |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Total operating revenues | 1,621.5 | 1,587.2 | 3,959.8 | 3,647.1
Wisconsin | Operating Segments | Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | 16.9 | 7.0 | 29.6 | 12.8
Wisconsin | Operating Segments | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,604.6 | 1,580.2 | 3,930.2 | 3,634.3
Wisconsin | Operating Segments | Utility operations | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,604.6 | 1,580.2 | 3,930.2 | 3,634.3
Wisconsin | Operating Segments | Electric | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,345.9 | 1,303.1 | 2,779.2 | 2,623.1
Wisconsin | Operating Segments | Natural gas | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 258.7 | 277.1 | 1,151.0 | 1,011.2
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 | 243.4 | 280.5 | 955.4 | 1,039.8
Illinois | Operating Segments |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Total operating revenues | 262.2 | 270.6 | 1,011.9 | 1,058.9
Illinois | Operating Segments | Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | 18.8 | (9.9) | 56.5 | 19.1
Illinois | Operating Segments | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 243.4 | 280.5 | 955.4 | 1,039.8
Illinois | Operating Segments | Utility operations | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 243.4 | 280.5 | 955.4 | 1,039.8
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 | 243.4 | 280.5 | 955.4 | 1,039.8
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 | 77.9 | 76.5 | 331.4 | 300.2
Other States | Operating Segments |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Total operating revenues | 84.3 | 82.3 | 341.6 | 309.4
Other States | Operating Segments | Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | 1.0 | 0.4 | (0.8) | (1.7)
Other States | Operating Segments | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 83.3 | 81.9 | 342.4 | 311.1
Other States | Operating Segments | Utility operations | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 77.9 | 76.5 | 331.4 | 300.2
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 | 77.9 | 76.5 | 331.4 | 300.2
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 | 5.4 | 5.4 | 11.0 | 10.9
Non-Utility Energy Infrastructure | Operating Segments |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Total operating revenues | 215.6 | 189.4 | 426.3 | 383.7
Non-Utility Energy Infrastructure | Operating Segments | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 93.4 | 69.5 | 182.3 | 145.1
Non-Utility Energy Infrastructure | Operating Segments | Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | 122.2 | 119.9 | 244.0 | 238.6
Non-Utility Energy Infrastructure | Operating Segments | Utility operations | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 10.5 | 11.4 | 23.7 | 25.5
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 | 10.5 | 11.4 | 23.7 | 25.5
Non-Utility Energy Infrastructure | Operating Segments | Other non-utility revenues | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 82.9 | 58.1 | 158.6 | 119.6
Corporate and Other | Operating Segments |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Total operating revenues | 0.0 | 0.0 | 0.0 | 0.0
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 | 0.0
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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