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OPERATING REVENUES - DISAGGREGATION OF OPERATING REVENUES BY SEGMENT (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Disaggregation of Operating Revenues    
Total operating revenues $ 2,888.1 $ 2,908.1
Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 2,858.2 2,899.6
Other operating revenues    
Disaggregation of Operating Revenues    
Other operating revenues 29.9 8.5
Utility Operations | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 2,811.1 2,852.9
Electric | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 1,203.8 1,187.5
Natural gas | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 1,607.3 1,665.4
Other non-utility revenues | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 47.1 46.7
Reconciling Eliminations    
Disaggregation of Operating Revenues    
Total operating revenues (124.1) (116.9)
Reconciling Eliminations | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers (22.7) (16.4)
Reconciling Eliminations | Other operating revenues    
Disaggregation of Operating Revenues    
Other operating revenues (101.4) (100.5)
Reconciling Eliminations | Utility Operations | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers (21.1) (14.8)
Reconciling Eliminations | Electric | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 0.0 0.0
Reconciling Eliminations | Natural gas | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers (21.1) (14.8)
Reconciling Eliminations | Other non-utility revenues | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers (1.6) (1.6)
Total Utility Operations    
Disaggregation of Operating Revenues    
Total operating revenues 2,846.0 2,865.3
Total Utility Operations | Other operating revenues    
Disaggregation of Operating Revenues    
Other operating revenues 29.9 8.3
Total Utility Operations | Transferred over time | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 2,816.1 2,857.0
Total Utility Operations | Utility Operations | Transferred over time | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 2,810.9 2,852.4
Total Utility Operations | Electric | Transferred over time | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 1,203.8 1,187.5
Total Utility Operations | Natural gas | Transferred over time | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 1,607.1 1,664.9
Total Utility Operations | Other non-utility revenues | Transferred over time | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 5.2 4.6
Wisconsin    
Disaggregation of Operating Revenues    
Total operating revenues 1,996.3 1,942.3
Wisconsin | Other operating revenues    
Disaggregation of Operating Revenues    
Other operating revenues 8.1 8.0
Wisconsin | Transferred over time | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 1,988.2 1,934.3
Wisconsin | Utility Operations | Transferred over time | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 1,988.2 1,934.3
Wisconsin | Electric | Transferred over time | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 1,203.8 1,187.5
Wisconsin | Natural gas | Transferred over time | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 784.4 746.8
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
Illinois    
Disaggregation of Operating Revenues    
Total operating revenues 599.7 682.1
Illinois | Other operating revenues    
Disaggregation of Operating Revenues    
Other operating revenues 22.0 2.2
Illinois | Transferred over time | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 577.7 679.9
Illinois | Utility Operations | Transferred over time | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 577.7 679.9
Illinois | Electric | Transferred over time | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 0.0 0.0
Illinois | Natural gas | Transferred over time | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 577.7 679.9
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
Other States    
Disaggregation of Operating Revenues    
Total operating revenues 250.0 240.9
Other States | Other operating revenues    
Disaggregation of Operating Revenues    
Other operating revenues (0.2) (1.9)
Other States | Transferred over time | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 250.2 242.8
Other States | Utility Operations | Transferred over time | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 245.0 238.2
Other States | Electric | Transferred over time | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 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 245.0 238.2
Other States | Other non-utility revenues | Transferred over time | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 5.2 4.6
Non-Utility Energy Infrastructure    
Disaggregation of Operating Revenues    
Total operating revenues 166.2 159.5
Non-Utility Energy Infrastructure | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 64.8 59.0
Non-Utility Energy Infrastructure | Other operating revenues    
Disaggregation of Operating Revenues    
Other operating revenues 101.4 100.5
Non-Utility Energy Infrastructure | Utility Operations | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 21.3 15.3
Non-Utility Energy Infrastructure | Electric | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 0.0 0.0
Non-Utility Energy Infrastructure | Natural gas | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 21.3 15.3
Non-Utility Energy Infrastructure | Other non-utility revenues | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 43.5 43.7
Corporate and Other    
Disaggregation of Operating Revenues    
Total operating revenues 0.0 0.2
Corporate and Other | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 0.0 0.0
Corporate and Other | Other operating revenues    
Disaggregation of Operating Revenues    
Other operating revenues 0.0 0.2
Corporate and Other | Utility Operations | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 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
Corporate and Other | Natural gas | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 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