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Segment Information
 12 Months Ended
Dec. 31, 2023
Segment Reporting [Abstract]  
SEGMENT INFORMATION SEGMENT INFORMATION
We use net income attributed to common shareholders to measure segment profitability and to allocate resources to our businesses. At December 31, 2023, we reported six segments, which are described below.

•The Wisconsin segment includes the electric and natural gas utility operations of WE, WPS, WG, and UMERC.

•The Illinois segment includes the natural gas utility operations of PGL and NSG.
•The other states segment includes the natural gas utility operations of MERC and MGU and the non-utility operations of MERC.

•The electric transmission segment includes our approximate 60% ownership interest in ATC, a for-profit, transmission-only company regulated by the FERC for cost of service and certain state regulatory commissions for routing and siting of transmission projects, and our approximate 75% ownership interest in ATC Holdco, which was formed to invest in transmission-related projects outside of ATC's traditional footprint.

•The non-utility energy infrastructure segment includes:
◦We Power, which owns and leases generating facilities to WE,
◦Bluewater, which owns underground natural gas storage facilities in Michigan that provide approximately one-third of the current storage needs for our Wisconsin natural gas utilities, and
◦WECI, which owns majority interests in multiple renewable generating facilities.

See Note 2, Acquisitions, for more information on recent WECI acquisitions.

•The corporate and other segment includes the operations of the WEC Energy Group holding company, the Integrys holding company, the PELLC holding company, Wispark, Wisvest, WECC, and WBS.

All of our operations and assets are located within the United States. The following tables show summarized financial information related to our reportable segments for the years ended December 31, 2023, 2022, and 2021.
 Utility Operations  
2023 (in millions)
WisconsinIllinoisOther StatesTotal Utility
Operations		Electric TransmissionNon-Utility Energy InfrastructureCorporate and OtherReconciling
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)— 
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 
Equity in earnings of transmission affiliates— — — — 177.5 — — — 177.5 
Interest expense601.0 88.9 15.9 705.8 19.4 94.3 257.6 (350.2)726.9 
Income tax expense (benefit)237.4 48.6 16.3 302.3 39.0 (68.4)(68.3)— 204.6 
Net income (loss)852.5 140.0 48.1 1,040.6 119.1 334.8 (162.8)— 1,331.7 
Net income (loss) attributed to common shareholders851.3 140.0 48.1 1,039.4 119.1 336.0 (162.8)— 1,331.7 
Capital expenditures and asset acquisitions2,134.4 489.8 103.5 2,727.7 — 754.4 25.8 — 3,507.9 
Total assets (1)
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)    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 StatesTotal Utility
Operations		Electric TransmissionNon-Utility Energy InfrastructureCorporate and OtherReconciling
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)— 
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 
Equity in earnings of transmission affiliates— — — — 194.7 — — — 194.7 
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 
Net income (loss)759.6 226.9 39.7 1,026.2 129.5 324.8 (70.8)— 1,409.7 
Net income (loss) attributed to common shareholders758.4 226.9 39.7 1,025.0 129.5 324.4 (70.8)— 1,408.1 
Capital expenditures and asset acquisitions1,610.8 484.9 101.1 2,196.8 — 483.8 16.3 — 2,696.9 
Total assets (1)
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)    Total assets at December 31, 2022 reflect an elimination of $1,632.9 million for all lease activity between We Power and WE.
 Utility Operations  
2021 (in millions)
WisconsinIllinoisOther StatesTotal Utility
Operations		Electric TransmissionNon-Utility Energy InfrastructureCorporate and OtherReconciling
Eliminations		WEC Energy Group Consolidated
External revenues $6,037.0 $1,672.8 $519.0 $8,228.8 $— $86.7 $0.5 $— $8,316.0 
Intersegment revenues— — — — — 452.8 — (452.8)— 
Other operation and maintenance1,455.2 433.5 90.4 1,979.1 — 43.1 (7.5)(9.2)2,005.5 
Depreciation and amortization726.9 218.1 38.1 983.1 — 125.3 25.9 (60.0)1,074.3 
Equity in earnings of transmission affiliates— — — — 158.1 — — — 158.1 
Interest expense555.6 66.6 6.2 628.4 19.4 71.0 92.8 (340.5)471.1 
Loss on debt extinguishment— — — — — — 36.3 — 36.3 
Income tax expense (benefit)119.9 79.3 11.5 210.7 32.3 3.1 (45.8)— 200.3 
Net income (loss)707.7 223.0 35.8 966.5 106.3 276.2 (50.5)— 1,298.5 
Net income (loss) attributed to common shareholders706.5 223.0 35.8 965.3 106.3 279.2 (50.5)— 1,300.3 
Capital expenditures and asset acquisitions1,389.7 533.7 95.9 2,019.3 — 335.3 18.1 — 2,372.7 
Total assets (1)
25,687.9 7,853.4 1,506.1 35,047.4 1,792.7 4,627.7 785.3 (3,264.6)38,988.5 

(1)    Total assets at December 31, 2021 reflect an elimination of $1,729.9 million for all lease activity between We Power and WE.