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OPERATING REVENUES - DISAGGREGATION OF OPERATING REVENUES BY SEGMENT (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Disaggregation of Operating Revenues    
Total operating revenues $ 3,149.5 $ 2,680.2
Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 3,103.2 2,604.5
Other operating revenues    
Disaggregation of Operating Revenues    
Other operating revenues 46.3 75.7
Utility operations | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 3,037.8 2,549.0
Electric | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 1,320.0 1,185.3
Natural gas | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 1,717.8 1,363.7
Other non-utility revenues | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 65.4 55.5
Reconciling Eliminations    
Disaggregation of Operating Revenues    
Total operating revenues (120.1) (120.1)
Reconciling Eliminations | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers (15.0) (15.8)
Reconciling Eliminations | Other operating revenues    
Disaggregation of Operating Revenues    
Other operating revenues (105.1) (104.3)
Reconciling Eliminations | Utility operations | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers (13.4) (14.2)
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 (13.4) (14.2)
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 | Natural gas | Transferred over time | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 1,717.1 1,363.4
Total Utility Operations | Operating Segments    
Disaggregation of Operating Revenues    
Total operating revenues 3,075.3 2,629.4
Total Utility Operations | Operating Segments | Other operating revenues    
Disaggregation of Operating Revenues    
Other operating revenues 32.7 75.7
Total Utility Operations | Operating Segments | Transferred over time | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 3,042.6 2,553.7
Total Utility Operations | Operating Segments | Utility operations | Transferred over time | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 3,037.1 2,548.7
Total Utility Operations | Operating Segments | Electric | Transferred over time | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 1,320.0 1,185.3
Total Utility Operations | Operating Segments | Natural gas | Transferred over time | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 1,717.1 1,363.4
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 5.0
Wisconsin | Electric | Transferred over time | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 1,320.0 1,185.3
Wisconsin | Natural gas | Transferred over time | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 734.1 586.0
Wisconsin | Operating Segments    
Disaggregation of Operating Revenues    
Total operating revenues 2,059.9 1,778.8
Wisconsin | Operating Segments | Other operating revenues    
Disaggregation of Operating Revenues    
Other operating revenues 5.8 7.5
Wisconsin | Operating Segments | Transferred over time | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 2,054.1 1,771.3
Wisconsin | Operating Segments | Utility operations | Transferred over time | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 2,054.1 1,771.3
Wisconsin | Operating Segments | Electric | Transferred over time | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 1,320.0 1,185.3
Wisconsin | Operating Segments | Natural gas | Transferred over time | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 734.1 586.0
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
Illinois | Natural gas | Transferred over time | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 759.3 603.8
Illinois | Operating Segments    
Disaggregation of Operating Revenues    
Total operating revenues 788.3 666.0
Illinois | Operating Segments | Other operating revenues    
Disaggregation of Operating Revenues    
Other operating revenues 29.0 62.2
Illinois | Operating Segments | Transferred over time | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 759.3 603.8
Illinois | Operating Segments | Utility operations | Transferred over time | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 759.3 603.8
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
Illinois | Operating Segments | Natural gas | Transferred over time | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 759.3 603.8
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
Other States | Natural gas | Transferred over time | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 223.7 173.6
Other States | Operating Segments    
Disaggregation of Operating Revenues    
Total operating revenues 227.1 184.6
Other States | Operating Segments | Other operating revenues    
Disaggregation of Operating Revenues    
Other operating revenues (2.1) 6.0
Other States | Operating Segments | Transferred over time | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 229.2 178.6
Other States | Operating Segments | Utility operations | Transferred over time | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 223.7 173.6
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
Other States | Operating Segments | Natural gas | Transferred over time | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 223.7 173.6
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 5.0
Non-Utility Energy Infrastructure | Operating Segments    
Disaggregation of Operating Revenues    
Total operating revenues 194.3 170.9
Non-Utility Energy Infrastructure | Operating Segments | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 75.6 66.6
Non-Utility Energy Infrastructure | Operating Segments | Other operating revenues    
Disaggregation of Operating Revenues    
Other operating revenues 118.7 104.3
Non-Utility Energy Infrastructure | Operating Segments | Utility operations | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 14.1 14.5
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
Non-Utility Energy Infrastructure | Operating Segments | Natural gas | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 14.1 14.5
Non-Utility Energy Infrastructure | Operating Segments | Other non-utility revenues | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 61.5 52.1
Corporate and Other | Operating Segments    
Disaggregation of Operating Revenues    
Total operating revenues 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
Corporate and Other | Operating Segments | Other operating revenues    
Disaggregation of Operating Revenues    
Other operating revenues 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
Corporate and Other | Operating Segments | Electric | Revenues from contracts with customers    
Disaggregation of Operating Revenues    
Revenues from contracts with customers 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
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