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SEGMENT INFORMATION (Tables)
 6 Months Ended
Jun. 30, 2020
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, 2020 and 2019:
 Utility Operations  
(in millions)WisconsinIllinoisOther StatesTotal Utility
Operations		Electric TransmissionNon-Utility Energy InfrastructureCorporate
and Other		Reconciling
Eliminations		WEC Energy Group Consolidated
Three Months Ended      
June 30, 2020
External revenues$1,206.2  $261.2  $66.7  $1,534.1  $—  $13.7  $0.9  $—  $1,548.7  
Intersegment revenues—  —  —  —  —  111.6  —  (111.6) —  
Other operation and maintenance349.4  93.2  20.4  463.0  —  7.6  3.5  (1.0) 473.1  
Depreciation and amortization167.6  48.6  8.3  224.5  —  24.4  6.4  (12.8) 242.5  
Operating income (loss)277.6  59.5  6.0  343.1  —  91.4  (9.0) (86.7) 338.8  
Equity in earnings of transmission affiliates—  —  —  —  52.9  —  —  —  52.9  
Interest expense140.0  16.1  2.5  158.6  4.9  15.1  32.6  (86.8) 124.4  
 Utility Operations  
(in millions)WisconsinIllinoisOther StatesTotal Utility
Operations		Electric TransmissionNon-Utility Energy InfrastructureCorporate
and Other		Reconciling
Eliminations		WEC Energy Group Consolidated
Three Months Ended      
June 30, 2019
External revenues$1,253.3  $242.9  $68.8  $1,565.0  $—  $24.3  $0.9  $—  $1,590.2  
Intersegment revenues—  —  —  —  —  99.0  —  (99.0) —  
Other operation and maintenance 363.9  107.0  23.4  494.3  —  6.8  1.8  0.7  503.6  
Depreciation and amortization152.9  45.0  6.7  204.6  —  22.9  6.0  (3.6) 229.9  
Operating income (loss) 270.2  42.6  4.6  317.4  —  91.3  (7.1) (87.0) 314.6  
Equity in earnings of transmission affiliates—  —  —  —  36.9  —  —  —  36.9  
Interest expense142.7  13.9  1.9  158.5  2.7  15.5  36.5  (89.1) 124.1  

Utility Operations
(in millions)WisconsinIllinoisOther StatesTotal Utility OperationsElectric TransmissionNon-Utility Energy InfrastructureCorporate and OtherReconciling EliminationsWEC Energy Group Consolidated
Six Months Ended
June 30, 2020
External revenues$2,705.1  $708.8  $213.1  $3,627.0  $—  $28.9  $1.4  $—  $3,657.3  
Intersegment revenues—  —  —  —  —  226.0  —  (226.0) —  
Other operation and maintenance680.2  197.3  42.1  919.6  —  12.8  1.9  (5.5) 928.8  
Depreciation and amortization333.0  96.1  16.1  445.2  —  48.9  12.5  (25.0) 481.6  
Operating income (loss)704.4  221.1  43.4  968.9  —  182.9  (13.2) (173.2) 965.4  
Equity in earnings of transmission affiliates—  —  —  —  92.7  —  —  —  92.7  
Interest expense283.1  32.1  4.7  319.9  9.7  30.4  67.7  (173.9) 253.8  

Utility Operations
(in millions)WisconsinIllinoisOther StatesTotal Utility OperationsElectric TransmissionNon-Utility Energy InfrastructureCorporate and OtherReconciling EliminationsWEC Energy Group Consolidated
Six Months Ended
June 30, 2019
External revenues$2,886.7  $779.4  $254.0  $3,920.1  $—  $44.9  $2.6  $—  $3,967.6  
Intersegment revenues—  —  —  —  —  206.2  —  (206.2) —  
Other operation and maintenance756.6  235.2  51.0  1,042.8  —  10.6  0.8  —  1,054.2  
Depreciation and amortization303.9  89.5  13.2  406.6  —  45.5  12.4  (8.2) 456.3  
Operating income (loss)632.0  180.5  46.1  858.6  —  184.0  (11.0) (174.2) 857.4  
Equity in earnings of transmission affiliates—  —  —  —  73.0  —  —  —  73.0  
Interest expense286.1  28.7  4.2  319.0  5.3  31.2  71.6  (178.6) 248.5