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SEGMENT INFORMATION (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2023
USD ($)
segment
Mar. 31, 2022
USD ($)
Segment information    
Number of reportable segments | segment 6  
Operating revenues $ 2,888.1 $ 2,908.1
Other operation and maintenance 534.0 454.4
Depreciation and amortization 305.5 278.1
Equity in earnings of transmission affiliates 43.8 41.7
Interest expense 172.2 117.6
Income tax expense (benefit) 74.1 127.1
Net income (loss) 507.6 568.0
Net income (loss) attributed to common shareholders 507.5 565.9
External revenues    
Segment information    
Operating revenues 2,888.1 2,908.1
Intersegment revenues    
Segment information    
Operating revenues 0.0 0.0
Utility operations    
Segment information    
Other operation and maintenance 519.2 450.8
Depreciation and amortization 276.2 253.9
Equity in earnings of transmission affiliates 0.0 0.0
Interest expense 176.4 157.3
Income tax expense (benefit) 119.1 147.9
Net income (loss) 403.8 433.3
Net income (loss) attributed to common shareholders 403.5 433.0
Utility operations | External revenues    
Segment information    
Operating revenues 2,846.0 2,865.3
Utility operations | Intersegment revenues    
Segment information    
Operating revenues 0.0 0.0
Reconciling eliminations    
Segment information    
Other operation and maintenance (1.6) (1.6)
Depreciation and amortization (18.5) (16.3)
Equity in earnings of transmission affiliates 0.0 0.0
Interest expense (84.5) (84.4)
Income tax expense (benefit) 0.0 0.0
Net income (loss) 0.0 0.0
Net income (loss) attributed to common shareholders 0.0 0.0
Reconciling eliminations | External revenues    
Segment information    
Operating revenues 0.0 0.0
Reconciling eliminations | Intersegment revenues    
Segment information    
Operating revenues $ (124.1) (116.9)
ATC    
Segment information    
Ownership interest (as a percent) 60.00%  
Equity in earnings of transmission affiliates $ 42.9 41.0
ATC Holdco    
Segment information    
Ownership interest (as a percent) 75.00%  
Equity in earnings of transmission affiliates $ 0.9 0.7
Wisconsin    
Segment information    
Operating revenues 1,996.3 1,942.3
Wisconsin | Utility operations    
Segment information    
Other operation and maintenance 380.8 312.6
Depreciation and amortization 207.3 187.1
Equity in earnings of transmission affiliates 0.0 0.0
Interest expense 150.6 136.3
Income tax expense (benefit) 65.9 95.4
Net income (loss) 257.5 288.4
Net income (loss) attributed to common shareholders 257.2 288.1
Wisconsin | Utility operations | External revenues    
Segment information    
Operating revenues 1,996.3 1,942.3
Wisconsin | Utility operations | Intersegment revenues    
Segment information    
Operating revenues 0.0 0.0
Illinois    
Segment information    
Operating revenues 599.7 682.1
Illinois | Utility operations    
Segment information    
Other operation and maintenance 113.7 113.6
Depreciation and amortization 58.5 56.8
Equity in earnings of transmission affiliates 0.0 0.0
Interest expense 21.6 17.7
Income tax expense (benefit) 42.0 42.1
Net income (loss) 113.1 113.4
Net income (loss) attributed to common shareholders 113.1 113.4
Illinois | Utility operations | External revenues    
Segment information    
Operating revenues 599.7 682.1
Illinois | Utility operations | Intersegment revenues    
Segment information    
Operating revenues 0.0 0.0
Other States    
Segment information    
Operating revenues 250.0 240.9
Other States | Utility operations    
Segment information    
Other operation and maintenance 24.7 24.6
Depreciation and amortization 10.4 10.0
Equity in earnings of transmission affiliates 0.0 0.0
Interest expense 4.2 3.3
Income tax expense (benefit) 11.2 10.4
Net income (loss) 33.2 31.5
Net income (loss) attributed to common shareholders 33.2 31.5
Other States | Utility operations | External revenues    
Segment information    
Operating revenues 250.0 240.9
Other States | Utility operations | Intersegment revenues    
Segment information    
Operating revenues 0.0 0.0
Electric Transmission    
Segment information    
Other operation and maintenance 0.0 0.0
Depreciation and amortization 0.0 0.0
Equity in earnings of transmission affiliates 43.8 41.7
Interest expense 4.8 4.9
Income tax expense (benefit) 9.7 8.9
Net income (loss) 29.3 27.8
Net income (loss) attributed to common shareholders 29.3 27.8
Electric Transmission | External revenues    
Segment information    
Operating revenues 0.0 0.0
Electric Transmission | Intersegment revenues    
Segment information    
Operating revenues $ 0.0 0.0
Electric Transmission | ATC    
Segment information    
Ownership interest (as a percent) 60.00%  
Electric Transmission | ATC Holdco    
Segment information    
Ownership interest (as a percent) 75.00%  
Non-Utility Energy Infrastructure    
Segment information    
Natural gas storage needs provided to Wisconsin utilities 33.00%  
Operating revenues $ 166.2 159.5
Other operation and maintenance 17.8 10.9
Depreciation and amortization 42.7 34.0
Equity in earnings of transmission affiliates 0.0 0.0
Interest expense 19.9 17.2
Income tax expense (benefit) (17.8) (4.9)
Net income (loss) 88.3 93.3
Net income (loss) attributed to common shareholders 88.5 91.5
Non-Utility Energy Infrastructure | External revenues    
Segment information    
Operating revenues 42.1 42.6
Non-Utility Energy Infrastructure | Intersegment revenues    
Segment information    
Operating revenues 124.1 116.9
Corporate and Other    
Segment information    
Operating revenues 0.0 0.2
Other operation and maintenance (1.4) (5.7)
Depreciation and amortization 5.1 6.5
Equity in earnings of transmission affiliates 0.0 0.0
Interest expense 55.6 22.6
Income tax expense (benefit) (36.9) (24.8)
Net income (loss) (13.8) 13.6
Net income (loss) attributed to common shareholders (13.8) 13.6
Corporate and Other | External revenues    
Segment information    
Operating revenues 0.0 0.2
Corporate and Other | Intersegment revenues    
Segment information    
Operating revenues $ 0.0 $ 0.0