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Segment Information
 12 Months Ended
Dec. 31, 2020
Segment Reporting [Abstract]  
SEGMENT INFORMATION SEGMENT INFORMATION
Effective December 31, 2020, we changed our measure of segment profitability from operating income to net income attributed to common shareholders. At December 31, 2020, 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 and non-utility operations of MERC and MGU.

•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 holds our ownership interests in the following wind generating facilities:
▪90% ownership interest in Bishop Hill III, located in Henry County, Illinois,
▪80% ownership interest in Coyote Ridge, located in Brookings County, South Dakota,
▪90% ownership interest in Upstream, located in Antelope County, Nebraska,
▪90% ownership interest in Blooming Grove, located in McLean County, Illinois, and
▪85% ownership interest in Tatanka Ridge, located in Deuel County, South Dakota.

See Note 2, Acquisitions, for more information on Bishop Hill III, Coyote Ridge, Upstream, Blooming Grove, and Tatanka Ridge.

•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, WBS, and PDL. See Note 3, Dispositions, for more information on the sale of our remaining PDL solar facilities.
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, 2020, 2019, and 2018.
 Utility Operations  
2020 (in millions)
WisconsinIllinoisOther StatesTotal Utility
Operations		Electric TransmissionNon-Utility Energy InfrastructureCorporate and OtherReconciling
Eliminations		WEC Energy Group Consolidated
External revenues $5,473.5 $1,321.9 $384.1 $7,179.5 $— $60.0 $2.2 $— $7,241.7 
Intersegment revenues— — — — — 448.5 — (448.5)— 
Other operation and maintenance1,476.7 435.4 87.0 1,999.1 — 24.9 17.4 (9.2)2,032.2 
Depreciation and amortization674.5 196.7 33.5 904.7 — 98.9 25.1 (52.8)975.9 
Equity in earnings of transmission affiliates— — — — 175.8 — — — 175.8 
Interest expense561.3 63.5 10.2 635.0 19.4 60.8 124.0 (345.5)493.7 
Loss on debt extinguishment— — — — — — 38.4 — 38.4 
Income tax expense (benefit)132.7 66.1 13.1 211.9 43.7 44.7 (72.4)— 227.9 
Net income (loss)691.6 203.5 39.0 934.1 112.6 261.1 (106.4)— 1,201.4 
Net income (loss) attributed to common shareholders690.4 203.5 39.0 932.9 112.6 260.8 (106.4)— 1,199.9 
Capital expenditures and asset acquisitions1,382.4 652.7 144.3 2,179.4 — 661.8 33.1 — 2,874.3 
Total assets (1)
24,599.2 7,471.8 1,336.2 33,407.2 1,764.7 4,455.2 762.2 (3,361.2)37,028.1 

(1)    Total assets at December 31, 2020 reflect an elimination of $1,824.5 million for all lease activity between We Power and WE.
Utility Operations  
2019 (in millions)
WisconsinIllinoisOther StatesTotal Utility
Operations		Electric TransmissionNon-Utility Energy InfrastructureCorporate and OtherReconciling
Eliminations		WEC Energy Group Consolidated
External revenues $5,647.1 $1,357.1 $426.0 $7,430.2 $— $88.5 $4.4 $— $7,523.1 
Intersegment revenues— — — — — 407.4 — (407.4)— 
Other operation and maintenance1,591.3 461.1 98.5 2,150.9 — 19.7 14.0 0.2 2,184.8 
Depreciation and amortization617.0 181.3 27.5 825.8 — 92.0 24.3 (15.8)926.3 
Equity in earnings of transmission affiliates— — — — 127.6 — — — 127.6 
Interest expense572.0 59.0 8.5 639.5 13.1 62.1 140.9 (354.1)501.5 
Income tax expense (benefit)35.2 60.2 13.6 109.0 27.1 59.9 (71.0)— 125.0 
Net income (loss)651.1 170.3 43.2 864.6 87.4 245.5 (62.8)— 1,134.7 
Net income (loss) attributed to common shareholders649.9 170.3 43.2 863.4 87.4 246.0 (62.8)— 1,134.0 
Capital expenditures and asset acquisitions1,378.6 624.9 109.1 2,112.6 — 389.9 26.5 — 2,529.0 
Total assets (1)
23,934.8 6,932.5 1,237.8 32,105.1 1,723.1 3,654.1 814.0 (3,344.5)34,951.8 

(1)    Total assets at December 31, 2019 reflect an elimination of $1,896.7 million for all lease activity between We Power and WE.
 Utility Operations  
2018 (in millions)
WisconsinIllinoisOther StatesTotal Utility
Operations		Electric TransmissionNon-Utility Energy InfrastructureCorporate and OtherReconciling
Eliminations		WEC Energy Group Consolidated
External revenues $5,794.7 $1,400.0 $438.2 $7,632.9 $— $37.9 $8.7 $— $7,679.5 
Intersegment revenues— — — — — 430.5 — (430.5)— 
Other operation and maintenance2,076.1 472.3 101.0 2,649.4 — 12.6 1.8 (393.3)2,270.5 
Depreciation and amortization546.6 170.3 24.1 741.0 — 75.7 29.1 — 845.8 
Equity in earnings of transmission affiliates— — — — 136.7 — — — 136.7 
Interest expense200.7 51.2 8.7 260.6 0.3 63.7 125.8 (5.3)445.1 
Income tax expense (benefit)46.7 51.8 15.9 114.4 53.7 73.9 (72.2)— 169.8 
Net income (loss)618.2 147.1 44.1 809.4 82.8 228.4 (60.1)— 1,060.5 
Net income (loss) attributed to common shareholders617.0 147.1 44.1 808.2 82.8 228.4 (60.1)— 1,059.3 
Capital expenditures and asset acquisitions1,466.1 547.1 103.6 2,116.8 — 260.6 39.7 — 2,417.1 
Total assets (1)
23,407.0 6,483.3 1,147.9 31,038.2 1,665.3 3,227.2 959.6 (3,414.5)33,475.8 

(1)    Total assets at December 31, 2018 reflect an elimination of $1,968.5 million for all lease activity between We Power and WE.