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OPERATING REVENUES - DISAGGREGATION OF OPERATING REVENUES BY SEGMENT (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Disaggregation of Operating Revenues        
Total operating revenues $ 2,127.9 $ 1,676.2 $ 5,036.0 $ 4,367.6
Revenues from contracts with customers        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 2,121.2 1,654.3 5,020.8 4,323.3
Other operating revenues        
Disaggregation of Operating Revenues        
Other operating revenues 6.7 21.9 15.2 44.3
Total regulated revenues | Revenues from contracts with customers        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 2,089.6 1,629.6 4,942.5 4,272.3
Electric | Revenues from contracts with customers        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 1,221.1 1,083.2 2,408.6 2,178.2
Natural gas | Revenues from contracts with customers        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 868.5 546.4 2,533.9 2,094.1
Other non-utility revenues | Revenues from contracts with customers        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 31.6 24.7 78.3 51.0
Reconciling Eliminations        
Disaggregation of Operating Revenues        
Total operating revenues (115.5) (112.5) (232.4) (227.2)
Reconciling Eliminations | Revenues from contracts with customers        
Disaggregation of Operating Revenues        
Revenues from contracts with customers (15.0) (12.6) (31.4) (27.5)
Reconciling Eliminations | Other operating revenues        
Disaggregation of Operating Revenues        
Other operating revenues (100.5) (99.9) (201.0) (199.7)
Reconciling Eliminations | Total regulated revenues | Revenues from contracts with customers        
Disaggregation of Operating Revenues        
Revenues from contracts with customers (11.0) (8.7) (25.8) (22.0)
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 (11.0) (8.7) (25.8) (22.0)
Reconciling Eliminations | Other non-utility revenues | Revenues from contracts with customers        
Disaggregation of Operating Revenues        
Revenues from contracts with customers (4.0) (3.9) (5.6) (5.5)
Total Utility Operations        
Disaggregation of Operating Revenues        
Total operating revenues 2,099.7 1,655.1 4,965.0 4,323.5
Total Utility Operations | Other operating revenues        
Disaggregation of Operating Revenues        
Other operating revenues 6.6 21.8 14.9 44.1
Total Utility Operations | Transferred over time | Revenues from contracts with customers        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 2,093.1 1,633.3 4,950.1 4,279.4
Total Utility Operations | Total regulated revenues | Transferred over time | Revenues from contracts with customers        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 2,088.6 1,628.9 4,941.0 4,270.3
Total Utility Operations | Electric | Transferred over time | Revenues from contracts with customers        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 1,221.1 1,083.2 2,408.6 2,178.2
Total Utility Operations | Natural gas | Transferred over time | Revenues from contracts with customers        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 867.5 545.7 2,532.4 2,092.1
Total Utility Operations | Other non-utility revenues | Transferred over time | Revenues from contracts with customers        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 4.5 4.4 9.1 9.1
Wisconsin        
Disaggregation of Operating Revenues        
Total operating revenues 1,557.4 1,307.5 3,499.7 3,039.2
Wisconsin | Other operating revenues        
Disaggregation of Operating Revenues        
Other operating revenues 6.8 11.6 14.8 21.0
Wisconsin | Transferred over time | Revenues from contracts with customers        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 1,550.6 1,295.9 3,484.9 3,018.2
Wisconsin | Total regulated revenues | Transferred over time | Revenues from contracts with customers        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 1,550.6 1,295.9 3,484.9 3,018.2
Wisconsin | Electric | Transferred over time | Revenues from contracts with customers        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 1,221.1 1,083.2 2,408.6 2,178.2
Wisconsin | Natural gas | Transferred over time | Revenues from contracts with customers        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 329.5 212.7 1,076.3 840.0
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 442.4 275.5 1,124.5 978.9
Illinois | Other operating revenues        
Disaggregation of Operating Revenues        
Other operating revenues 0.2 9.4 2.4 19.3
Illinois | Transferred over time | Revenues from contracts with customers        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 442.2 266.1 1,122.1 959.6
Illinois | Total regulated revenues | Transferred over time | Revenues from contracts with customers        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 442.2 266.1 1,122.1 959.6
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 442.2 266.1 1,122.1 959.6
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 99.9 72.1 340.8 305.4
Other States | Other operating revenues        
Disaggregation of Operating Revenues        
Other operating revenues (0.4) 0.8 (2.3) 3.8
Other States | Transferred over time | Revenues from contracts with customers        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 100.3 71.3 343.1 301.6
Other States | Total regulated revenues | Transferred over time | Revenues from contracts with customers        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 95.8 66.9 334.0 292.5
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 95.8 66.9 334.0 292.5
Other States | Other non-utility revenues | Transferred over time | Revenues from contracts with customers        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 4.5 4.4 9.1 9.1
Non-Utility Energy Infrastructure        
Disaggregation of Operating Revenues        
Total operating revenues 143.6 133.5 303.1 271.1
Non-Utility Energy Infrastructure | Revenues from contracts with customers        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 43.1 33.6 102.1 71.4
Non-Utility Energy Infrastructure | Other operating revenues        
Disaggregation of Operating Revenues        
Other operating revenues 100.5 99.9 201.0 199.7
Non-Utility Energy Infrastructure | Total regulated revenues | Revenues from contracts with customers        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 12.0 9.4 27.3 24.0
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
Non-Utility Energy Infrastructure | Natural gas | Revenues from contracts with customers        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 12.0 9.4 27.3 24.0
Non-Utility Energy Infrastructure | Other non-utility revenues | Revenues from contracts with customers        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 31.1 24.2 74.8 47.4
Corporate and Other        
Disaggregation of Operating Revenues        
Total operating revenues 0.1 0.1 0.3 0.2
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 0.3 0.2
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