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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