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SEGMENT INFORMATION (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
Jun. 30, 2025
USD ($)
Mar. 31, 2025
USD ($)
Sep. 30, 2024
USD ($)
Jun. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
numberOfSegments
Sep. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Segment information                  
Number of reportable segments | numberOfSegments           6      
Operating revenues $ 2,104.0     $ 1,863.5   $ 7,263.0 $ 6,315.7    
Fuel and purchased power costs 502.4     433.9   1,284.5 1,115.4    
Cost of natural gas sold 105.7     86.9   1,059.8 802.2    
Other operation and maintenance 605.1     566.8   1,809.3 1,631.0    
Depreciation and amortization 373.4     340.5   1,102.2 1,010.5    
Property and revenue taxes 67.8     51.7   215.2 194.7    
Equity in earnings of transmission affiliates 54.8     46.7   160.3 138.3    
Other income, net 23.8     44.0   68.4 128.7    
Interest expense 223.6     204.2   667.4 596.8    
Income tax expense (benefit) 34.4     31.6   114.6 160.9    
Preferred stock dividends of subsidiary 0.3     0.3   0.9 0.9    
Net loss attributed to noncontrolling interests 1.4 $ 2.7 $ (1.0) 1.8 $ 1.6 3.1 3.4    
Net income (loss) attributed to common shareholders 271.3     240.1   1,240.9 1,073.7    
Capital expenditures and asset acquisitions 1,564.6     796.0   3,501.2 2,032.6    
Equity method investments 2,341.4     2,163.8   2,341.4 2,163.8    
Total assets 49,808.9     45,196.5   49,808.9 45,196.5 $ 47,363.2  
External revenues                  
Segment information                  
Operating revenues 2,104.0     1,863.5   7,263.0 6,315.7    
Intersegment revenues                  
Segment information                  
Operating revenues 0.0     0.0   0.0 0.0    
Utility operations                  
Segment information                  
Fuel and purchased power costs 502.4     433.9   1,284.5 1,115.4    
Cost of natural gas sold 114.7     96.1   1,086.9 830.7    
Other operation and maintenance 575.3     552.6   1,718.3 1,586.5    
Depreciation and amortization 333.2     308.3   980.7 911.3    
Property and revenue taxes 62.5     47.6   199.5 182.0    
Equity in earnings of transmission affiliates 0.0     0.0   0.0 0.0    
Other income, net 27.2     37.4   69.2 107.4    
Interest expense 185.7     186.7   559.7 558.3    
Income tax expense (benefit) 39.3     43.0   250.7 247.9    
Preferred stock dividends of subsidiary 0.3     0.3   0.9 0.9    
Net loss attributed to noncontrolling interests 0.0     0.0   0.0 0.0    
Net income (loss) attributed to common shareholders 241.9     185.5   1,031.5 836.4    
Capital expenditures and asset acquisitions 1,499.4     778.7   2,996.2 1,982.9    
Equity method investments 17.3     15.5   17.3 15.5    
Total assets 42,168.3     39,334.4   42,168.3 39,334.4    
Utility operations | External revenues                  
Segment information                  
Operating revenues 2,028.1     1,816.6   7,043.5 6,162.0    
Utility operations | Intersegment revenues                  
Segment information                  
Operating revenues 0.0     0.0   0.0 0.0    
Reconciling eliminations                  
Segment information                  
Fuel and purchased power costs 0.0     0.0   0.0 0.0    
Cost of natural gas sold (9.8)     (9.6)   (33.7) (34.6)    
Other operation and maintenance (1.6)     (1.6)   (7.1) (7.1)    
Depreciation and amortization (25.6)     (22.6)   (74.3) (65.3)    
Property and revenue taxes 0.0     0.0   0.0 0.0    
Equity in earnings of transmission affiliates 0.0     0.0   0.0 0.0    
Other income, net (7.9)     (7.3)   (23.3) (20.8)    
Interest expense (88.3)     (89.7)   (265.7) (269.7)    
Income tax expense (benefit) 0.0     0.0   0.0 0.0    
Preferred stock dividends of subsidiary 0.0     0.0   0.0 0.0    
Net loss attributed to noncontrolling interests 0.0     0.0   0.0 0.0    
Net income (loss) attributed to common shareholders 0.0     0.0   0.0 0.0    
Capital expenditures and asset acquisitions 0.0     0.0   0.0 0.0    
Equity method investments 0.0     0.0   0.0 0.0    
Total assets (3,637.5)     (3,577.9)   (3,637.5) (3,577.9)    
Reconciling eliminations | WE                  
Segment information                  
Total assets 2,613.4     2,687.6   2,613.4 2,687.6    
Reconciling eliminations | External revenues                  
Segment information                  
Operating revenues 0.0     0.0   0.0 0.0    
Reconciling eliminations | Intersegment revenues                  
Segment information                  
Operating revenues $ (117.4)     (116.2)   $ (357.5) (355.9)    
ATC                  
Segment information                  
Ownership interest (as a percent) 60.00%         60.00%      
Equity in earnings of transmission affiliates $ 54.2     46.1   $ 154.5 136.7    
Equity method investments $ 2,245.6 2,177.5   2,054.1 2,029.7 $ 2,245.6 2,054.1 2,085.1 $ 1,980.8
ATC Holdco                  
Segment information                  
Ownership interest (as a percent) 75.00%         75.00%      
Equity in earnings of transmission affiliates $ 0.6     0.6   $ 5.8 1.6    
Equity method investments 23.2 $ 22.6   26.7 $ 26.1 23.2 26.7 $ 23.8 $ 25.1
Wisconsin | Operating Segments                  
Segment information                  
Operating revenues 1,791.6     1,590.0   5,438.7 4,737.0    
Wisconsin | Operating Segments | Utility operations                  
Segment information                  
Fuel and purchased power costs 502.4     433.9   1,284.5 1,115.4    
Cost of natural gas sold 75.8     61.4   582.7 444.9    
Other operation and maintenance 443.7     403.5   1,274.8 1,182.6    
Depreciation and amortization 255.7     232.4   749.5 685.3    
Property and revenue taxes 44.5     32.8   135.0 125.0    
Equity in earnings of transmission affiliates 0.0     0.0   0.0 0.0    
Other income, net 25.0     35.7   62.4 101.4    
Interest expense 158.9     160.3   478.6 475.4    
Income tax expense (benefit) 54.0     63.3   171.5 172.6    
Preferred stock dividends of subsidiary 0.3     0.3   0.9 0.9    
Net loss attributed to noncontrolling interests 0.0     0.0   0.0 0.0    
Net income (loss) attributed to common shareholders 281.3     237.8   823.6 636.3    
Capital expenditures and asset acquisitions 1,376.0     659.5   2,692.4 1,644.5    
Equity method investments 17.3     15.5   17.3 15.5    
Total assets 32,467.2     29,887.4   32,467.2 29,887.4    
Wisconsin | Operating Segments | Utility operations | External revenues                  
Segment information                  
Operating revenues 1,791.6     1,590.0   5,438.7 4,737.0    
Wisconsin | Operating Segments | Utility operations | Intersegment revenues                  
Segment information                  
Operating revenues 0.0     0.0   0.0 0.0    
Illinois | Operating Segments                  
Segment information                  
Operating revenues 183.5     173.6   1,242.4 1,116.4    
Illinois | Operating Segments | Utility operations                  
Segment information                  
Fuel and purchased power costs 0.0     0.0   0.0 0.0    
Cost of natural gas sold 21.4     17.8   339.1 254.3    
Other operation and maintenance 108.0     126.5   367.3 336.1    
Depreciation and amortization 65.0     63.9   194.2 191.1    
Property and revenue taxes 11.4     12.2   44.6 41.9    
Equity in earnings of transmission affiliates 0.0     0.0   0.0 0.0    
Other income, net 2.1     1.5   6.5 5.7    
Interest expense 21.8     22.3   67.1 70.8    
Income tax expense (benefit) (11.5)     (19.0)   66.4 63.3    
Preferred stock dividends of subsidiary 0.0     0.0   0.0 0.0    
Net loss attributed to noncontrolling interests 0.0     0.0   0.0 0.0    
Net income (loss) attributed to common shareholders (30.5)     (48.6)   170.2 164.6    
Capital expenditures and asset acquisitions 93.9     86.6   219.3 256.2    
Equity method investments 0.0     0.0   0.0 0.0    
Total assets 8,049.4     7,893.9   8,049.4 7,893.9    
Illinois | Operating Segments | Utility operations | External revenues                  
Segment information                  
Operating revenues 183.5     173.6   1,242.4 1,116.4    
Illinois | Operating Segments | Utility operations | Intersegment revenues                  
Segment information                  
Operating revenues 0.0     0.0   0.0 0.0    
Other States | Operating Segments                  
Segment information                  
Operating revenues 53.0     53.0   362.4 308.6    
Other States | Operating Segments | Utility operations                  
Segment information                  
Fuel and purchased power costs 0.0     0.0   0.0 0.0    
Cost of natural gas sold 17.5     16.9   165.1 131.5    
Other operation and maintenance 23.6     22.6   76.2 67.8    
Depreciation and amortization 12.5     12.0   37.0 34.9    
Property and revenue taxes 6.6     2.6   19.9 15.1    
Equity in earnings of transmission affiliates 0.0     0.0   0.0 0.0    
Other income, net 0.1     0.2   0.3 0.3    
Interest expense 5.0     4.1   14.0 12.1    
Income tax expense (benefit) (3.2)     (1.3)   12.8 12.0    
Preferred stock dividends of subsidiary 0.0     0.0   0.0 0.0    
Net loss attributed to noncontrolling interests 0.0     0.0   0.0 0.0    
Net income (loss) attributed to common shareholders (8.9)     (3.7)   37.7 35.5    
Capital expenditures and asset acquisitions 29.5     32.6   84.5 82.2    
Equity method investments 0.0     0.0   0.0 0.0    
Total assets 1,651.7     1,553.1   1,651.7 1,553.1    
Other States | Operating Segments | Utility operations | External revenues                  
Segment information                  
Operating revenues 53.0     53.0   362.4 308.6    
Other States | Operating Segments | Utility operations | Intersegment revenues                  
Segment information                  
Operating revenues 0.0     0.0   0.0 0.0    
Electric Transmission | Operating Segments                  
Segment information                  
Fuel and purchased power costs 0.0     0.0   0.0 0.0    
Cost of natural gas sold 0.0     0.0   0.0 0.0    
Other operation and maintenance 0.0     0.0   0.0 0.0    
Depreciation and amortization 0.0     0.0   0.0 0.0    
Property and revenue taxes 0.0     0.0   0.0 0.0    
Equity in earnings of transmission affiliates 54.8     46.7   160.3 138.3    
Other income, net 0.0     0.0   0.0 0.0    
Interest expense 4.8     4.8   14.5 14.5    
Income tax expense (benefit) 12.7     10.2   36.0 30.6    
Preferred stock dividends of subsidiary 0.0     0.0   0.0 0.0    
Net loss attributed to noncontrolling interests 0.0     0.0   0.0 0.0    
Net income (loss) attributed to common shareholders 37.3     31.7   109.8 93.2    
Capital expenditures and asset acquisitions 0.0     0.0   0.0 0.0    
Equity method investments 2,268.8     2,080.8   2,268.8 2,080.8    
Total assets 2,268.8     2,085.4   2,268.8 2,085.4    
Electric Transmission | Operating Segments | External revenues                  
Segment information                  
Operating revenues 0.0     0.0   0.0 0.0    
Electric Transmission | Operating Segments | Intersegment revenues                  
Segment information                  
Operating revenues $ 0.0     0.0   $ 0.0 0.0    
Electric Transmission | ATC                  
Segment information                  
Ownership interest (as a percent) 60.00%         60.00%      
Electric Transmission | ATC Holdco                  
Segment information                  
Ownership interest (as a percent) 75.00%         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 $ 193.3     163.1   $ 577.0 509.6    
Fuel and purchased power costs 0.0     0.0   0.0 0.0    
Cost of natural gas sold 0.8     0.4   6.6 6.1    
Other operation and maintenance 34.6     19.1   107.6 62.3    
Depreciation and amortization 60.6     49.2   179.6 147.9    
Property and revenue taxes 5.3     4.0   15.6 12.5    
Equity in earnings of transmission affiliates 0.0     0.0   0.0 0.0    
Other income, net 0.8     0.2   2.2 0.4    
Interest expense 30.5     23.4   92.6 71.6    
Income tax expense (benefit) (24.2)     (16.0)   (98.7) (59.6)    
Preferred stock dividends of subsidiary 0.0     0.0   0.0 0.0    
Net loss attributed to noncontrolling interests 1.4     1.8   3.1 3.4    
Net income (loss) attributed to common shareholders 87.9     85.0   279.0 272.6    
Capital expenditures and asset acquisitions 58.3     9.0   490.4 33.7    
Equity method investments 0.0     0.0   0.0 0.0    
Total assets 7,809.9     6,210.0   7,809.9 6,210.0    
Non-Utility Energy Infrastructure | Operating Segments | External revenues                  
Segment information                  
Operating revenues 75.9     46.9   219.5 153.7    
Non-Utility Energy Infrastructure | Operating Segments | Intersegment revenues                  
Segment information                  
Operating revenues 117.4     116.2   357.5 355.9    
Corporate and Other | Operating Segments                  
Segment information                  
Operating revenues 0.0     0.0   0.0 0.0    
Fuel and purchased power costs 0.0     0.0   0.0 0.0    
Cost of natural gas sold 0.0     0.0   0.0 0.0    
Other operation and maintenance (3.2)     (3.3)   (9.5) (10.7)    
Depreciation and amortization 5.2     5.6   16.2 16.6    
Property and revenue taxes 0.0     0.1   0.1 0.2    
Equity in earnings of transmission affiliates 0.0     0.0   0.0 0.0    
Other income, net 3.7     13.7   20.3 41.7    
Interest expense 90.9     79.0   266.3 222.1    
Income tax expense (benefit) 6.6     (5.6)   (73.4) (58.0)    
Preferred stock dividends of subsidiary 0.0     0.0   0.0 0.0    
Net loss attributed to noncontrolling interests 0.0     0.0   0.0 0.0    
Net income (loss) attributed to common shareholders (95.8)     (62.1)   (179.4) (128.5)    
Capital expenditures and asset acquisitions 6.9     8.3   14.6 16.0    
Equity method investments 55.3     67.5   55.3 67.5    
Total assets 1,199.4     1,144.6   1,199.4 1,144.6    
Corporate and Other | Operating Segments | External revenues                  
Segment information                  
Operating revenues 0.0     0.0   0.0 0.0    
Corporate and Other | Operating Segments | Intersegment revenues                  
Segment information                  
Operating revenues $ 0.0     $ 0.0   $ 0.0 $ 0.0