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SEGMENT INFORMATION (Tables)
 9 Months Ended
Sep. 30, 2023
Segment Reporting [Abstract]  
Schedule of financial information related to our reportable segments The following tables show summarized financial information related to our reportable segments for the three and nine months ended September 30, 2023 and 2022:
Utility Operations
(in millions)WisconsinIllinoisOther StatesTotal Utility OperationsElectric TransmissionNon-Utility Energy InfrastructureCorporate and OtherReconciling EliminationsWEC Energy Group Consolidated
Three Months Ended September 30, 2023
External revenues$1,622.0 $243.3 $47.6 $1,912.9 $— $44.5 $— $— $1,957.4 
Intersegment revenues— — — — — 115.3 — (115.3)— 
Other operation and maintenance387.1 86.5 21.7 495.3 — 21.5 1.3 (1.5)516.6 
Depreciation and amortization215.3 59.3 11.2 285.8 — 48.8 5.3 (19.6)320.3 
Equity in earnings of transmission affiliates— — — — 44.7 — — — 44.7 
Interest expense148.7 22.0 3.7 174.4 5.0 24.8 66.3 (88.0)182.5 
Income tax expense (benefit)69.3 8.9 (2.0)76.2 10.0 (6.7)(19.1)— 60.4 
Net income (loss)243.4 24.7 (6.0)262.1 29.7 66.7 (42.9)— 315.6 
Net income (loss) attributed to common shareholders243.1 24.7 (6.0)261.8 29.7 67.4 (42.9)— 316.0 

Utility Operations
(in millions)WisconsinIllinoisOther StatesTotal Utility OperationsElectric TransmissionNon-Utility Energy InfrastructureCorporate and OtherReconciling EliminationsWEC Energy Group Consolidated
Three Months Ended September 30, 2022
External revenues$1,676.8 $230.3 $69.2 $1,976.3 $— $26.6 $0.1 $— $2,003.0 
Intersegment revenues— — — — — 113.3 — (113.3)— 
Other operation and maintenance329.1 100.2 21.0 450.3 — 12.1 (6.5)(1.6)454.3 
Depreciation and amortization189.2 57.9 10.3 257.4 — 34.0 6.2 (17.3)280.3 
Equity in earnings of transmission affiliates— — — — 63.7 — — — 63.7 
Interest expense137.2 18.1 3.3 158.6 4.9 17.0 30.9 (83.9)127.5 
Income tax expense (benefit)63.7 5.8 (1.9)67.6 14.3 1.7 (10.2)— 73.4 
Net income (loss)195.2 14.9 (6.1)204.0 44.5 70.4 (17.2)— 301.7 
Net income (loss) attributed to common shareholders194.9 14.9 (6.1)203.7 44.5 71.0 (17.2)— 302.0 
Utility Operations
(in millions)WisconsinIllinoisOther StatesTotal Utility OperationsElectric TransmissionNon-Utility Energy InfrastructureCorporate and OtherReconciling EliminationsWEC Energy Group Consolidated
Nine Months Ended September 30, 2023
External revenues$5,042.8 $1,116.5 $379.5 $6,538.8 $— $136.6 $0.1 $— $6,675.5 
Intersegment revenues— — — — — 358.4 — (358.4)— 
Other operation and maintenance1,119.7 305.5 68.2 1,493.4 — 59.6 0.6 (7.0)1,546.6 
Depreciation and amortization632.9 176.3 32.2 841.4 — 139.9 15.6 (57.2)939.7 
Equity in earnings of transmission affiliates— — — — 132.1 — — — 132.1 
Interest expense449.4 65.0 12.0 526.4 14.6 69.8 183.9 (261.3)533.4 
Income tax expense (benefit)188.8 61.8 10.5 261.1 29.4 (44.2)(63.3)— 183.0 
Net income (loss)686.8 167.9 30.9 885.6 88.1 240.9 (101.4)— 1,113.2 
Net income (loss) attributed to common shareholders685.9 167.9 30.9 884.7 88.1 241.8 (101.4)— 1,113.2 

Utility Operations
(in millions)WisconsinIllinoisOther StatesTotal Utility OperationsElectric TransmissionNon-Utility Energy InfrastructureCorporate and OtherReconciling EliminationsWEC Energy Group Consolidated
Nine Months Ended September 30, 2022
External revenues$5,176.5 $1,354.8 $410.0 $6,941.3 $— $97.3 $0.4 $— $7,039.0 
Intersegment revenues— — — — — 345.7 — (345.7)— 
Other operation and maintenance979.6 292.9 68.5 1,341.0 — 36.9 (13.1)(7.1)1,357.7 
Depreciation and amortization564.0 172.1 30.5 766.6 — 102.3 19.5 (50.4)838.0 
Equity in earnings of transmission affiliates— — — — 148.4 — — — 148.4 
Interest expense409.1 53.8 9.8 472.7 14.6 51.6 78.1 (252.1)364.9 
Income tax expense (benefit)208.4 69.1 9.4 286.9 32.5 (10.5)(45.0)— 263.9 
Net income (loss)632.3 184.7 28.1 845.1 101.3 244.0 (32.9)— 1,157.5 
Net income (loss) attributed to common shareholders631.4 184.7 28.1 844.2 101.3 242.8 (32.9)— 1,155.4