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Segment Information (Tables)
 12 Months Ended
Dec. 31, 2020
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, 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.