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SEGMENT INFORMATION (Tables)
 6 Months Ended
Jun. 30, 2024
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 six months ended June 30, 2024 and 2023:
Utility Operations
(in millions)WisconsinIllinoisOther StatesTotal Utility OperationsElectric TransmissionNon-Utility Energy InfrastructureCorporate and OtherReconciling EliminationsWEC Energy Group Consolidated
Three Months Ended June 30, 2024
External revenues$1,368.2 $276.8 $71.0 $1,716.0 $— $56.0 $— $— $1,772.0 
Intersegment revenues— — — — — 119.6 — (119.6)— 
Other operation and maintenance389.2 102.6 24.6 516.4 — 25.0 (4.0)(4.0)533.4 
Depreciation and amortization228.3 63.7 11.5 303.5 — 49.6 5.4 (21.9)336.6 
Equity in earnings of transmission affiliates— — — — 46.8 — — — 46.8 
Interest expense157.3 23.5 4.0 184.8 4.9 24.1 76.5 (89.7)200.6 
Income tax expense (benefit)34.4 10.2 0.3 44.9 10.5 (20.2)6.4 — 41.6 
Net income (loss)132.4 25.7 0.6 158.7 31.4 91.7 (71.8)— 210.0 
Net income (loss) attributed to common shareholders132.1 25.7 0.6 158.4 31.4 93.3 (71.8)— 211.3 

Utility Operations
(in millions)WisconsinIllinoisOther StatesTotal Utility OperationsElectric TransmissionNon-Utility Energy InfrastructureCorporate and OtherReconciling EliminationsWEC Energy Group Consolidated
Three Months Ended June 30, 2023
External revenues$1,424.5 $273.5 $81.9 $1,779.9 $— $50.0 $0.1 $— $1,830.0 
Intersegment revenues— — — — — 119.0 — (119.0)— 
Other operation and maintenance351.8 105.3 21.8 478.9 — 20.3 0.7 (3.9)496.0 
Depreciation and amortization210.3 58.5 10.6 279.4 — 48.4 5.2 (19.1)313.9 
Equity in earnings of transmission affiliates— — — — 43.6 — — — 43.6 
Interest expense150.1 21.4 4.1 175.6 4.8 25.1 62.0 (88.8)178.7 
Income tax expense (benefit)53.6 10.9 1.3 65.8 9.7 (19.7)(7.3)— 48.5 
Net income (loss)185.9 30.1 3.7 219.7 29.1 85.9 (44.7)— 290.0 
Net income (loss) attributed to common shareholders185.6 30.1 3.7 219.4 29.1 85.9 (44.7)— 289.7 
Utility Operations
(in millions)WisconsinIllinoisOther StatesTotal Utility OperationsElectric TransmissionNon-Utility Energy InfrastructureCorporate and OtherReconciling EliminationsWEC Energy Group Consolidated
Six Months Ended June 30, 2024
External revenues$3,147.0 $942.8 $255.6 $4,345.4 $— $106.8 $— $— $4,452.2 
Intersegment revenues— — — — — 239.7 — (239.7)— 
Other operation and maintenance779.1 209.6 45.2 1,033.9 — 43.2 (7.4)(5.5)1,064.2 
Depreciation and amortization452.9 127.2 22.9 603.0 — 98.7 11.0 (42.7)670.0 
Equity in earnings of transmission affiliates— — — — 91.6 — — — 91.6 
Interest expense315.1 48.5 8.0 371.6 9.7 48.2 143.1 (180.0)392.6 
Income tax expense (benefit)109.3 82.3 13.3 204.9 20.4 (43.6)(52.4)— 129.3 
Net income (loss)399.1 213.2 39.2 651.5 61.5 186.0 (66.4)— 832.6 
Net income (loss) attributed to common shareholders398.5 213.2 39.2 650.9 61.5 187.6 (66.4)— 833.6 

Utility Operations
(in millions)WisconsinIllinoisOther StatesTotal Utility OperationsElectric TransmissionNon-Utility Energy InfrastructureCorporate and OtherReconciling EliminationsWEC Energy Group Consolidated
Six Months Ended June 30, 2023
External revenues$3,420.8 $873.2 $331.9 $4,625.9 $— $92.1 $0.1 $— $4,718.1 
Intersegment revenues— — — — — 243.1 — (243.1)— 
Other operation and maintenance732.6 219.0 46.5 998.1 — 38.1 (0.7)(5.5)1,030.0 
Depreciation and amortization417.6 117.0 21.0 555.6 — 91.1 10.3 (37.6)619.4 
Equity in earnings of transmission affiliates— — — — 87.4 — — — 87.4 
Interest expense300.7 43.0 8.3 352.0 9.6 45.0 117.6 (173.3)350.9 
Income tax expense (benefit)119.5 52.9 12.5 184.9 19.4 (37.5)(44.2)— 122.6 
Net income (loss)443.4 143.2 36.9 623.5 58.4 174.2 (58.5)— 797.6 
Net income (loss) attributed to common shareholders442.8 143.2 36.9 622.9 58.4 174.4 (58.5)— 797.2