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SEGMENT INFORMATION (Tables)
 9 Months Ended
Sep. 30, 2021
Segment Reporting [Abstract]  
Financial information of reportable segments The following tables show summarized financial information related to our reportable segments for the three and nine months ended September 30, 2021 and 2020:
Utility Operations
(in millions)WisconsinIllinoisOther StatesTotal Utility OperationsElectric TransmissionNon-Utility Energy InfrastructureCorporate and OtherReconciling EliminationsWEC Energy Group Consolidated
Three Months Ended September 30, 2021
External revenues$1,458.6 $216.2 $52.8 $1,727.6 $— $18.7 $0.2 $— $1,746.5 
Intersegment revenues— — — — — 110.8 — (110.8)— 
Other operation and maintenance359.1 91.2 19.6 469.9 — 9.9 (4.5)(1.6)473.7 
Depreciation and amortization184.4 55.4 9.6 249.4 — 31.2 6.3 (15.3)271.6 
Equity in earnings of transmission affiliates— — — — 42.3 — — — 42.3 
Interest expense137.9 16.5 1.6 156.0 4.8 17.6 24.7 (85.1)118.0 
Income tax expense (benefit)33.6 7.0 (1.0)39.6 9.7 5.0 (3.5)— 50.8 
Net income (loss)197.8 19.1 (2.7)214.2 27.8 62.8 (16.1)— 288.7 
Net income (loss) attributed to common shareholders197.5 19.1 (2.7)213.9 27.8 64.4 (16.1)— 290.0 
Utility Operations
(in millions)WisconsinIllinoisOther StatesTotal Utility OperationsElectric TransmissionNon-Utility Energy InfrastructureCorporate and OtherReconciling EliminationsWEC Energy Group Consolidated
Three Months Ended September 30, 2020
External revenues$1,366.3 $221.9 $48.3 $1,636.5 $— $13.9 $0.6 $— $1,651.0 
Intersegment revenues— — — — — 109.6 — (109.6)— 
Other operation and maintenance363.8 109.2 20.4 493.4 — 5.9 1.0 (1.6)498.7 
Depreciation and amortization169.7 49.9 8.5 228.1 — 24.5 6.5 (14.1)245.0 
Equity in earnings of transmission affiliates— — — — 40.1 — — — 40.1 
Interest expense139.1 15.6 2.7 157.4 4.9 15.0 30.4 (85.7)122.0 
Income tax expense (benefit)37.5 (4.0)(1.2)32.3 9.0 13.4 (7.8)— 46.9 
Net income (loss)187.9 13.0 (3.3)197.6 26.3 62.9 (19.7)— 267.1 
Net income (loss) attributed to common shareholders187.6 13.0 (3.3)197.3 26.3 62.9 (19.7)— 266.8 

Utility Operations
(in millions)WisconsinIllinoisOther StatesTotal Utility OperationsElectric TransmissionNon-Utility Energy InfrastructureCorporate and OtherReconciling EliminationsWEC Energy Group Consolidated
Nine Months Ended September 30, 2021
External revenues$4,497.8 $1,195.1 $358.2 $6,051.1 $— $62.6 $0.4 $— $6,114.1 
Intersegment revenues— — — — — 338.0 — (338.0)— 
Other operation and maintenance1,047.1 291.3 64.0 1,402.4 — 31.2 (9.1)(7.1)1,417.4 
Depreciation and amortization540.4 162.1 28.2 730.7 — 93.5 19.3 (44.3)799.2 
Equity in earnings of transmission affiliates— — — — 126.2 — — — 126.2 
Interest expense417.8 49.6 4.6 472.0 14.5 53.5 73.5 (256.0)357.5 
Income tax expense (benefit)104.8 64.4 8.2 177.4 28.9 5.8 (32.3)— 179.8 
Net income (loss)601.2 174.8 24.5 800.5 82.8 202.3 (10.9)— 1,074.7 
Net income (loss) attributed to common shareholders600.3 174.8 24.5 799.6 82.8 204.6 (10.9)— 1,076.1 
Utility Operations
(in millions)WisconsinIllinoisOther StatesTotal Utility OperationsElectric TransmissionNon-Utility Energy InfrastructureCorporate and OtherReconciling EliminationsWEC Energy Group Consolidated
Nine Months Ended September 30, 2020
External revenues$4,071.4 $930.7 $261.4 $5,263.5 $— $42.8 $2.0 $— $5,308.3 
Intersegment revenues— — — — — 335.6 — (335.6)— 
Other operation and maintenance1,044.0 306.5 62.5 1,413.0 — 18.7 2.9 (7.1)1,427.5 
Depreciation and amortization502.7 146.0 24.6 673.3 — 73.4 19.0 (39.1)726.6 
Equity in earnings of transmission affiliates— — — — 132.8 — — — 132.8 
Interest expense422.2 47.7 7.4 477.3 14.6 45.4 98.1 (259.6)375.8 
Income tax expense (benefit)110.5 47.7 8.7 166.9 33.4 35.8 (45.4)— 190.7 
Net income (loss)565.0 152.4 25.8 743.2 84.8 193.2 (59.4)— 961.8 
Net income (loss) attributed to common shareholders564.1 152.4 25.8 742.3 84.8 193.2 (59.4)— 960.9