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Segment Information (Tables)
 12 Months Ended
Dec. 31, 2024
Segment Reporting [Abstract]  
Schedule of information concerning our reportable segments
The following tables show summarized financial information related to our reportable segments for the years ended December 31, 2024, 2023, and 2022.
 Utility Operations  
2024 (in millions)
WisconsinIllinoisOther States
Total Utility Operations
Electric TransmissionNon-Utility Energy Infrastructure
Corporate and Other
Reconciling Eliminations
WEC Energy Group Consolidated
External revenues $6,330.5 $1,602.4 $449.8 $8,382.7 $— $217.2 $— $— $8,599.9 
Intersegment revenues— — — — — 474.1 — (474.1)— 
Fuel and purchased power
1,455.7 — — 1,455.7 — — — — 1,455.7 
Cost of natural gas sold
661.9 376.7 198.6 1,237.2 — 9.1 — (46.0)1,200.3 
Other operation and maintenance1,547.9 461.5 93.9 2,103.3 — 75.1 (11.3)(9.1)2,158.0 
Impairment related to ICC disallowances— 12.1 — 12.1 — — — — 12.1 
Depreciation and amortization919.9 255.4 47.0 1,222.3 — 198.4 22.3 (88.5)1,354.5 
Property and revenue taxes
169.6 59.9 21.0 250.5 — 15.7 0.3 — 266.5 
Equity in earnings of transmission affiliates— — — — 207.5 — — — 207.5 
Other income, net (1)
146.6 7.6 0.3 154.5 — 1.0 54.4 (31.7)178.2 
Interest expense637.3 94.7 16.4 748.4 19.4 99.7 310.0 (362.2)815.3 
Gain on debt extinguishments
— — — — — — (23.1)— (23.1)
Income tax expense (benefit)220.5 97.6 18.7 336.8 47.1 (82.4)(79.5)— 222.0 
Preferred stock dividends of subsidiary
1.2 — — 1.2 — — — — 1.2 
Net loss attributed to noncontrolling interests
— — — — — 4.1 — — 4.1 
Net income (loss) attributed to common shareholders$863.1 $252.1 $54.5 $1,169.7 $141.0 $380.8 $(164.3)$— $1,527.2 
Other Segment Disclosures
Capital expenditures and asset acquisitions$2,347.1 $343.0 $118.3 $2,808.4 $— $945.8 $20.6 $— $3,774.8 
Equity method investments
15.7 — — 15.7 2,108.9 — 67.0 — 2,191.6 
Total assets (2)
30,622.7 8,168.8 1,646.0 40,437.5 2,126.0 7,316.0 1,037.3 (3,553.6)47,363.2 

(1)Includes amounts that are not material for interest income and other equity earnings from investments other than from transmission affiliates.

(2)    Total assets at December 31, 2024 reflect an elimination of $1,525.4 million for all lease activity between We Power and WE.
Utility Operations  
2023 (in millions)
WisconsinIllinoisOther States
Total Utility Operations
Electric TransmissionNon-Utility Energy Infrastructure
Corporate and Other
Reconciling Eliminations
WEC Energy Group Consolidated
External revenues $6,625.9 $1,557.8 $519.1 $8,702.8 $— $190.1 $0.1 $— $8,893.0 
Intersegment revenues— — — — — 476.4 — (476.4)— 
Fuel and purchased power
1,615.9 — — 1,615.9 — — — — 1,615.9 
Cost of natural gas sold
894.7 443.0 277.2 1,614.9 — 20.5 — (60.1)1,575.3 
Other operation and maintenance1,531.3 397.9 94.5 2,023.7 — 80.1 5.8 (9.1)2,100.5 
Impairment related to ICC disallowances— 178.9 — 178.9 — — — — 178.9 
Depreciation and amortization851.5 237.3 43.3 1,132.1 — 188.7 20.9 (77.5)1,264.2 
Property and revenue taxes
179.2 29.9 24.4 233.5 — 16.5 0.2 — 250.2 
Equity in earnings of transmission affiliates— — — — 177.5 — — — 177.5 
Other income, net (1)
137.6 6.7 0.6 144.9 — — 53.3 (20.5)177.7 
Interest expense601.0 88.9 15.9 705.8 19.4 94.3 258.1 (350.2)727.4 
Gain on debt extinguishments
— — — — — — (0.5)— (0.5)
Income tax expense (benefit)237.4 48.6 16.3 302.3 39.0 (68.4)(68.3)— 204.6 
Preferred stock dividends of subsidiary
1.2 — — 1.2 — — — — 1.2 
Net loss attributed to noncontrolling interests
— — — — — 1.2 — — 1.2 
Net income (loss) attributed to common shareholders$851.3 $140.0 $48.1 $1,039.4 $119.1 $336.0 $(162.8)$— $1,331.7 
Other Segment Disclosures
Capital expenditures and asset acquisitions$2,134.4 $489.8 $103.5 $2,727.7 $— $754.4 $25.8 $— $3,507.9 
Equity method investments
14.4 — — 14.4 2,005.9 — 61.3 — 2,081.6 
Total assets (2)
28,527.3 7,970.2 1,571.5 38,069.0 2,006.0 6,404.7 1,100.1 (3,640.1)43,939.7 

(1)Includes amounts that are not material for interest income and other equity earnings from investments other than from transmission affiliates.

(2)    Total assets at December 31, 2023 reflect an elimination of $1,630.6 million for all lease activity between We Power and WE.
 Utility Operations  
2022 (in millions)
WisconsinIllinoisOther States
Total Utility Operations
Electric TransmissionNon-Utility Energy Infrastructure
Corporate and Other
Reconciling Eliminations
WEC Energy Group Consolidated
External revenues $6,960.5 $1,890.9 $618.5 $9,469.9 $— $127.0 $0.5 $— $9,597.4 
Intersegment revenues— — — — — 463.0 — (463.0)— 
Fuel and purchased power
1,881.4 — — 1,881.4 — — — — 1,881.4 
Cost of natural gas sold
1,327.4 792.5 391.6 2,511.5 — 17.9 — (51.9)2,477.5 
Other operation and maintenance1,351.3 459.2 98.5 1,909.0 — 51.0 (12.9)(9.1)1,938.0 
Depreciation and amortization754.7 230.9 40.9 1,026.5 — 139.2 25.0 (68.1)1,122.6 
Property and revenue taxes
182.6 38.6 23.3 244.5 — 9.1 0.1 — 253.7 
Equity in earnings of transmission affiliates— — — — 194.7 — — — 194.7 
Other income, net (1)
99.9 14.1 2.5 116.5 — — 14.6 (2.3)128.8 
Interest expense555.9 73.8 13.9 643.6 19.4 68.9 119.4 (336.2)515.1 
Income tax expense (benefit)247.5 83.1 13.1 343.7 45.8 (20.9)(45.7)— 322.9 
Preferred stock dividends of subsidiary1.2 — — 1.2 — — — — 1.2 
Net income attributed to noncontrolling interests
— — — — — (0.4)— — (0.4)
Net income (loss) attributed to common shareholders$758.4 $226.9 $39.7 $1,025.0 $129.5 $324.4 $(70.8)$— $1,408.1 
Other Segment Disclosures
Capital expenditures and asset acquisitions$1,610.8 $484.9 $101.1 $2,196.8 $— $483.8 $16.3 $— $2,696.9 
Equity method investments
13.6 — — 13.6 1,909.2 — 59.1 — 1,981.9 
Total assets (2)
27,384.0 8,101.0 1,639.6 37,124.6 1,909.4 5,320.6 774.0 (3,256.5)41,872.1 

(1)Includes amounts that are not material for interest income and other equity earnings from investments other than from transmission affiliates.

(2)    Total assets at December 31, 2022 reflect an elimination of $1,632.9 million for all lease activity between We Power and WE.