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SEGMENT INFORMATION (Tables)
6 Months Ended
Jun. 30, 2022
Segment Reporting [Abstract]  
Financial information of reportable segments The following tables show summarized financial information related to our reportable segments for the three and six months ended June 30, 2022 and 2021:
Utility Operations
(in millions)WisconsinIllinoisOther StatesTotal Utility OperationsElectric TransmissionNon-Utility Energy InfrastructureCorporate and OtherReconciling EliminationsWEC Energy Group Consolidated
Three Months Ended June 30, 2022
External revenues$1,557.4 $442.4 $99.9 $2,099.7 $ $28.1 $0.1 $ $2,127.9 
Intersegment revenues     115.5  (115.5) 
Other operation and maintenance337.9 79.1 22.9 439.9  13.9 (0.9)(3.9)449.0 
Depreciation and amortization187.7 57.4 10.2 255.3  34.3 6.8 (16.8)279.6 
Equity in earnings of transmission affiliates    43.0    43.0 
Interest expense135.6 18.0 3.2 156.8 4.8 17.4 24.6 (83.8)119.8 
Income tax expense (benefit)49.3 21.2 0.9 71.4 9.3 (7.3)(10.0) 63.4 
Net income (loss)148.7 56.4 2.7 207.8 29.0 80.3 (29.3) 287.8 
Net income (loss) attributed to common shareholders148.4 56.4 2.7 207.5 29.0 80.3 (29.3) 287.5 
Utility Operations
(in millions)WisconsinIllinoisOther StatesTotal Utility OperationsElectric TransmissionNon-Utility Energy InfrastructureCorporate and OtherReconciling EliminationsWEC Energy Group Consolidated
Three Months Ended June 30, 2021
External revenues$1,307.5 $275.5 $72.1 $1,655.1 $— $21.0 $0.1 $— $1,676.2 
Intersegment revenues— — — — — 112.5 — (112.5)— 
Other operation and maintenance346.1 90.8 21.2 458.1 — 12.4 (2.8)(3.9)463.8 
Depreciation and amortization179.8 54.0 9.4 243.2 — 31.3 6.4 (14.7)266.2 
Equity in earnings of transmission affiliates— — — — 41.3 — — — 41.3 
Interest expense139.8 16.6 1.5 157.9 4.8 17.9 24.6 (85.2)120.0 
Income tax expense23.1 16.0 0.8 39.9 9.4 0.7 4.1 — 54.1 
Net income (loss)146.8 43.6 2.5 192.9 27.0 68.2 (12.4)— 275.7 
Net income (loss) attributed to common shareholders146.5 43.6 2.5 192.6 27.0 68.8 (12.4)— 276.0 

Utility Operations
(in millions)WisconsinIllinoisOther StatesTotal Utility OperationsElectric TransmissionNon-Utility Energy InfrastructureCorporate and OtherReconciling EliminationsWEC Energy Group Consolidated
Six Months Ended June 30, 2022
External revenues$3,499.7 $1,124.5 $340.8 $4,965.0 $ $70.7 $0.3 $ $5,036.0 
Intersegment revenues     232.4  (232.4) 
Other operation and maintenance650.5 192.7 47.5 890.7  24.8 (6.6)(5.5)903.4 
Depreciation and amortization374.8 114.2 20.2 509.2  68.3 13.3 (33.1)557.7 
Equity in earnings of transmission affiliates    84.7    84.7 
Interest expense271.9 35.7 6.5 314.1 9.7 34.6 47.2 (168.2)237.4 
Income tax expense (benefit)144.7 63.3 11.3 219.3 18.2 (12.2)(34.8) 190.5 
Net income (loss)437.1 169.8 34.2 641.1 56.8 173.6 (15.7) 855.8 
Net income (loss) attributed to common shareholders436.5 169.8 34.2 640.5 56.8 171.8 (15.7) 853.4 
Utility Operations
(in millions)WisconsinIllinoisOther StatesTotal Utility OperationsElectric TransmissionNon-Utility Energy InfrastructureCorporate and OtherReconciling EliminationsWEC Energy Group Consolidated
Six Months Ended June 30, 2021
External revenues$3,039.2 $978.9 $305.4 $4,323.5 $— $43.9 $0.2 $— $4,367.6 
Intersegment revenues— — — — — 227.2 — (227.2)— 
Other operation and maintenance688.0 200.1 44.4 932.5 — 21.3 (4.6)(5.5)943.7 
Depreciation and amortization356.0 106.7 18.6 481.3 — 62.3 13.0 (29.0)527.6 
Equity in earnings of transmission affiliates— — — — 83.9 — — — 83.9 
Interest expense279.9 33.1 3.0 316.0 9.7 35.9 48.8 (170.9)239.5 
Income tax expense (benefit)71.2 57.4 9.2 137.8 19.2 0.8 (28.8)— 129.0 
Net income403.4 155.7 27.2 586.3 55.0 139.5 5.2 — 786.0 
Net income attributed to common shareholders402.8 155.7 27.2 585.7 55.0 140.2 5.2 — 786.1