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SEGMENT INFORMATION (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2025
USD ($)
numberOfSegments
Mar. 31, 2024
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Segment information        
Number of reportable segments | numberOfSegments 6      
Operating revenues $ 3,149.5 $ 2,680.2    
Fuel and purchased power costs 390.3 349.2    
Cost of natural gas sold 775.4 577.9    
Other operation and maintenance 608.0 530.8    
Depreciation and amortization 359.9 333.4    
Property and revenue taxes 78.4 75.5    
Equity in earnings of transmission affiliates 53.6 44.8    
Other income, net 18.1 44.1    
Interest expense 223.0 192.0    
Income tax expense (benefit) 60.7 87.7    
Preferred stock dividends of subsidiary 0.3 0.3    
Net income attributed to noncontrolling interests (1.0) 0.0    
Net income (loss) attributed to common shareholders 724.2 622.3    
Capital expenditures and asset acquisitions 1,107.2 444.5    
Equity method investments 2,233.9 2,106.8    
Total assets 48,232.1 43,927.2 $ 47,363.2  
External revenues        
Segment information        
Operating revenues 3,149.5 2,680.2    
Intersegment revenues        
Segment information        
Operating revenues 0.0 0.0    
Utility operations        
Segment information        
Fuel and purchased power costs 390.3 349.2    
Cost of natural gas sold 784.3 587.3    
Other operation and maintenance 590.7 517.5    
Depreciation and amortization 320.2 299.5    
Property and revenue taxes 72.9 71.6    
Equity in earnings of transmission affiliates 0.0 0.0    
Other income, net 19.8 35.3    
Interest expense 189.3 186.8    
Income tax expense (benefit) 166.0 160.0    
Preferred stock dividends of subsidiary 0.3 0.3    
Net income attributed to noncontrolling interests 0.0      
Net income (loss) attributed to common shareholders 581.1 492.5    
Capital expenditures and asset acquisitions 688.5 424.6    
Equity method investments 16.3 14.5    
Total assets 40,819.2 38,060.5    
Utility operations | External revenues        
Segment information        
Operating revenues 3,075.3 2,629.4    
Utility operations | Intersegment revenues        
Segment information        
Operating revenues 0.0 0.0    
Reconciling eliminations        
Segment information        
Fuel and purchased power costs 0.0 0.0    
Cost of natural gas sold (13.4) (14.2)    
Other operation and maintenance (1.6) (1.5)    
Depreciation and amortization (23.9) (20.8)    
Property and revenue taxes 0.0 0.0    
Equity in earnings of transmission affiliates 0.0 0.0    
Other income, net (7.4) (6.7)    
Interest expense (88.6) (90.3)    
Income tax expense (benefit) 0.0 0.0    
Preferred stock dividends of subsidiary 0.0 0.0    
Net income attributed to noncontrolling interests 0.0      
Net income (loss) attributed to common shareholders 0.0 0.0    
Capital expenditures and asset acquisitions 0.0 0.0    
Equity method investments 0.0 0.0    
Total assets (3,876.1) (3,595.5)    
Reconciling eliminations | WE        
Segment information        
Total assets 2,648.6 2,719.3    
Reconciling eliminations | External revenues        
Segment information        
Operating revenues 0.0 0.0    
Reconciling eliminations | Intersegment revenues        
Segment information        
Operating revenues $ (120.1) (120.1)    
ATC        
Segment information        
Ownership interest (as a percent) 60.00%      
Equity in earnings of transmission affiliates $ 50.0 44.4    
Equity method investments $ 2,121.6 2,001.6 2,085.1 $ 1,980.8
ATC Holdco        
Segment information        
Ownership interest (as a percent) 75.00%      
Equity in earnings of transmission affiliates $ 3.6 0.4    
Equity method investments 27.4 25.5 $ 23.8 $ 25.1
Wisconsin | Operating Segments        
Segment information        
Operating revenues 2,059.9 1,778.8    
Wisconsin | Operating Segments | Utility operations        
Segment information        
Fuel and purchased power costs 390.3 349.2    
Cost of natural gas sold 378.5 301.8    
Other operation and maintenance 415.1 389.9    
Depreciation and amortization 243.6 224.6    
Property and revenue taxes 46.0 47.3    
Equity in earnings of transmission affiliates 0.0 0.0    
Other income, net 17.6 33.4    
Interest expense 161.8 157.8    
Income tax expense (benefit) 82.0 74.9    
Preferred stock dividends of subsidiary 0.3 0.3    
Net income attributed to noncontrolling interests 0.0      
Net income (loss) attributed to common shareholders 359.9 266.4    
Capital expenditures and asset acquisitions 616.9 330.8    
Equity method investments 16.3 14.5    
Total assets 30,836.9 28,546.7    
Wisconsin | Operating Segments | Utility operations | External revenues        
Segment information        
Operating revenues 2,059.9 1,778.8    
Wisconsin | Operating Segments | Utility operations | Intersegment revenues        
Segment information        
Operating revenues 0.0 0.0    
Illinois | Operating Segments        
Segment information        
Operating revenues 788.3 666.0    
Illinois | Operating Segments | Utility operations        
Segment information        
Fuel and purchased power costs 0.0 0.0    
Cost of natural gas sold 288.2 194.7    
Other operation and maintenance 146.9 107.0    
Depreciation and amortization 64.4 63.5    
Property and revenue taxes 20.4 18.1    
Equity in earnings of transmission affiliates 0.0 0.0    
Other income, net 2.1 1.9    
Interest expense 23.2 25.0    
Income tax expense (benefit) 69.2 72.1    
Preferred stock dividends of subsidiary 0.0 0.0    
Net income attributed to noncontrolling interests 0.0      
Net income (loss) attributed to common shareholders 178.1 187.5    
Capital expenditures and asset acquisitions 53.8 75.7    
Equity method investments 0.0 0.0    
Total assets 8,344.2 7,956.4    
Illinois | Operating Segments | Utility operations | External revenues        
Segment information        
Operating revenues 788.3 666.0    
Illinois | Operating Segments | Utility operations | Intersegment revenues        
Segment information        
Operating revenues 0.0 0.0    
Other States | Operating Segments        
Segment information        
Operating revenues 227.1 184.6    
Other States | Operating Segments | Utility operations        
Segment information        
Fuel and purchased power costs 0.0 0.0    
Cost of natural gas sold 117.6 90.8    
Other operation and maintenance 28.7 20.6    
Depreciation and amortization 12.2 11.4    
Property and revenue taxes 6.5 6.2    
Equity in earnings of transmission affiliates 0.0 0.0    
Other income, net 0.1 0.0    
Interest expense 4.3 4.0    
Income tax expense (benefit) 14.8 13.0    
Preferred stock dividends of subsidiary 0.0 0.0    
Net income attributed to noncontrolling interests 0.0      
Net income (loss) attributed to common shareholders 43.1 38.6    
Capital expenditures and asset acquisitions 17.8 18.1    
Equity method investments 0.0 0.0    
Total assets 1,638.1 1,557.4    
Other States | Operating Segments | Utility operations | External revenues        
Segment information        
Operating revenues 227.1 184.6    
Other States | Operating Segments | Utility operations | Intersegment revenues        
Segment information        
Operating revenues 0.0 0.0    
Electric Transmission | Operating Segments        
Segment information        
Fuel and purchased power costs 0.0 0.0    
Cost of natural gas sold 0.0 0.0    
Other operation and maintenance 0.0 0.0    
Depreciation and amortization 0.0 0.0    
Property and revenue taxes 0.0 0.0    
Equity in earnings of transmission affiliates 53.6 44.8    
Other income, net 0.0 0.0    
Interest expense 4.8 4.8    
Income tax expense (benefit) 11.9 9.9    
Preferred stock dividends of subsidiary 0.0 0.0    
Net income attributed to noncontrolling interests 0.0      
Net income (loss) attributed to common shareholders 36.9 30.1    
Capital expenditures and asset acquisitions 0.0 0.0    
Equity method investments 2,149.0 2,027.1    
Total assets 2,159.4 2,027.2    
Electric Transmission | Operating Segments | External revenues        
Segment information        
Operating revenues 0.0 0.0    
Electric Transmission | Operating Segments | 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%      
Non-Utility Energy Infrastructure | Operating Segments        
Segment information        
Operating revenues $ 194.3 170.9    
Fuel and purchased power costs 0.0 0.0    
Cost of natural gas sold 4.5 4.8    
Other operation and maintenance 22.1 18.2    
Depreciation and amortization 58.2 49.1    
Property and revenue taxes 5.4 3.8    
Equity in earnings of transmission affiliates 0.0 0.0    
Other income, net 0.7 0.0    
Interest expense 30.6 24.1    
Income tax expense (benefit) (35.6) (23.4)    
Preferred stock dividends of subsidiary 0.0 0.0    
Net income attributed to noncontrolling interests (1.0)      
Net income (loss) attributed to common shareholders 108.8 94.3    
Capital expenditures and asset acquisitions 414.6 17.3    
Equity method investments 0.0 0.0    
Total assets 7,886.4 6,320.8    
Non-Utility Energy Infrastructure | Operating Segments | External revenues        
Segment information        
Operating revenues 74.2 50.8    
Non-Utility Energy Infrastructure | Operating Segments | Intersegment revenues        
Segment information        
Operating revenues 120.1 120.1    
Corporate and Other | Operating Segments        
Segment information        
Operating revenues 0.0 0.0    
Fuel and purchased power costs 0.0 0.0    
Cost of natural gas sold 0.0 0.0    
Other operation and maintenance (3.2) (3.4)    
Depreciation and amortization 5.4 5.6    
Property and revenue taxes 0.1 0.1    
Equity in earnings of transmission affiliates 0.0 0.0    
Other income, net 5.0 15.5    
Interest expense 86.9 66.6    
Income tax expense (benefit) (81.6) (58.8)    
Preferred stock dividends of subsidiary 0.0 0.0    
Net income attributed to noncontrolling interests 0.0      
Net income (loss) attributed to common shareholders (2.6) 5.4    
Capital expenditures and asset acquisitions 4.1 2.6    
Equity method investments 68.6 65.2    
Total assets 1,243.2 1,114.2    
Corporate and Other | Operating Segments | External revenues        
Segment information        
Operating revenues 0.0 0.0    
Corporate and Other | Operating Segments | Intersegment revenues        
Segment information        
Operating revenues $ 0.0 $ 0.0