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OPERATING REVENUES - DISAGGREGATION OF OPERATING REVENUES BY SEGMENT (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Disaggregation of Operating Revenues |  |  |  |
Total operating revenues | $ 2,104.0 | $ 1,863.5 | $ 7,263.0 | $ 6,315.7
Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 2,088.3 | 1,854.3 | 7,189.1 | 6,202.2
Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | 15.7 | 9.2 | 73.9 | 113.5
Utility operations | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 2,021.9 | 1,803.1 | 6,997.7 | 6,035.2
Electric | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,608.6 | 1,422.2 | 4,231.7 | 3,756.0
Natural gas | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 413.3 | 380.9 | 2,766.0 | 2,279.2
Other non-utility revenues | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 66.4 | 51.2 | 191.4 | 167.0
Reconciling Eliminations |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Total operating revenues | (117.4) | (116.2) | (357.5) | (355.9)
Reconciling Eliminations | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | (11.3) | (11.2) | (40.8) | (41.7)
Reconciling Eliminations | Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | (106.1) | (105.0) | (316.7) | (314.2)
Reconciling Eliminations | Utility operations | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | (9.7) | (9.6) | (33.7) | (34.6)
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 | (9.7) | (9.6) | (33.7) | (34.6)
Reconciling Eliminations | Other non-utility revenues | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | (1.6) | (1.6) | (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 | 412.6 | 380.1 | 2,763.8 | 2,277.5
Total Utility Operations | Operating Segments |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Total operating revenues | 2,028.1 | 1,816.6 | 7,043.5 | 6,162.0
Total Utility Operations | Operating Segments | Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | 1.4 | 9.2 | 31.6 | 113.5
Total Utility Operations | Operating Segments | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 2,026.7 | 1,807.4 | 7,011.9 | 6,048.5
Total Utility Operations | Operating Segments | Utility operations | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 2,021.2 | 1,802.3 | 6,995.5 | 6,033.5
Total Utility Operations | Operating Segments | Electric | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,608.6 | 1,422.2 | 4,231.7 | 3,756.0
Total Utility Operations | Operating Segments | Natural gas | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 412.6 | 380.1 | 2,763.8 | 2,277.5
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 | 5.5 | 5.1 | 16.4 | 15.0
Wisconsin | Electric | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,608.6 | 1,422.2 | 4,231.7 | 3,756.0
Wisconsin | Natural gas | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 179.5 | 163.7 | 1,190.7 | 964.8
Wisconsin | Operating Segments |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Total operating revenues | 1,791.6 | 1,590.0 | 5,438.7 | 4,737.0
Wisconsin | Operating Segments | Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | 3.5 | 4.1 | 16.3 | 16.2
Wisconsin | Operating Segments | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,788.1 | 1,585.9 | 5,422.4 | 4,720.8
Wisconsin | Operating Segments | Utility operations | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,788.1 | 1,585.9 | 5,422.4 | 4,720.8
Wisconsin | Operating Segments | Electric | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 1,608.6 | 1,422.2 | 4,231.7 | 3,756.0
Wisconsin | Operating Segments | Natural gas | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 179.5 | 163.7 | 1,190.7 | 964.8
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 | 185.2 | 168.0 | 1,225.0 | 1,027.3
Illinois | Operating Segments |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Total operating revenues | 183.5 | 173.6 | 1,242.4 | 1,116.4
Illinois | Operating Segments | Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | (1.7) | 5.6 | 17.4 | 89.1
Illinois | Operating Segments | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 185.2 | 168.0 | 1,225.0 | 1,027.3
Illinois | Operating Segments | Utility operations | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 185.2 | 168.0 | 1,225.0 | 1,027.3
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 | 185.2 | 168.0 | 1,225.0 | 1,027.3
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 | 47.9 | 48.4 | 348.1 | 285.4
Other States | Operating Segments |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Total operating revenues | 53.0 | 53.0 | 362.4 | 308.6
Other States | Operating Segments | Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | (0.4) | (0.5) | (2.1) | 8.2
Other States | Operating Segments | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 53.4 | 53.5 | 364.5 | 300.4
Other States | Operating Segments | Utility operations | Transferred over time | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 47.9 | 48.4 | 348.1 | 285.4
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 | 47.9 | 48.4 | 348.1 | 285.4
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 | 5.5 | 5.1 | 16.4 | 15.0
Non-Utility Energy Infrastructure | Operating Segments |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Total operating revenues | 193.3 | 163.1 | 577.0 | 509.6
Non-Utility Energy Infrastructure | Operating Segments | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 72.9 | 58.1 | 218.0 | 195.4
Non-Utility Energy Infrastructure | Operating Segments | Other operating revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | 120.4 | 105.0 | 359.0 | 314.2
Non-Utility Energy Infrastructure | Operating Segments | Utility operations | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 10.4 | 10.4 | 35.9 | 36.3
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 | 10.4 | 35.9 | 36.3
Non-Utility Energy Infrastructure | Operating Segments | Other non-utility revenues | Revenues from contracts with customers |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Revenues from contracts with customers | 62.5 | 47.7 | 182.1 | 159.1
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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