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SEGMENT INFORMATION (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
segment
Jun. 30, 2018
USD ($)
Segment information        
Number of reportable segments | segment     6  
Operating revenues $ 1,590.2 $ 1,672.5 $ 3,967.6 $ 3,959.0
Other operation and maintenance 503.6 537.7 1,054.2 1,049.6
Depreciation and amortization 229.9 206.7 456.3 415.3
Operating income (loss) 314.6 330.8 857.4 875.9
Equity in earnings of transmission affiliates 36.9 28.7 73.0 61.5
Interest expense 124.1 108.5 248.5 215.2
Wisconsin        
Segment information        
Operating revenues 1,253.3 1,325.5 2,886.7 2,914.6
Illinois        
Segment information        
Operating revenues 242.9 268.0 779.4 775.3
Other States        
Segment information        
Operating revenues 68.8 72.4 254.0 242.3
Electric Transmission        
Segment information        
Other operation and maintenance 0.0 0.0 0.0 0.0
Depreciation and amortization 0.0 0.0 0.0 0.0
Operating income (loss) 0.0 0.0 0.0 0.0
Equity in earnings of transmission affiliates 36.9 28.7 73.0 61.5
Interest expense 2.7 0.0 $ 5.3 0.0
Non-Utility Energy Infrastructure        
Segment information        
Natural gas storage needs provided to Wisconsin utilities     33.00%  
Operating revenues 123.3 117.0 $ 251.1 235.1
Other operation and maintenance 6.8 4.5 10.6 6.2
Depreciation and amortization 22.9 18.3 45.5 36.6
Operating income (loss) 91.3 92.4 184.0 185.4
Equity in earnings of transmission affiliates 0.0 0.0 0.0 0.0
Interest expense 15.5 16.0 31.2 32.1
Corporate and Other        
Segment information        
Operating revenues 0.9 3.1 2.6 4.5
Other operation and maintenance 1.8 2.2 0.8 1.9
Depreciation and amortization 6.0 7.5 12.4 15.2
Operating income (loss) (7.1) (6.5) (11.0) (11.9)
Equity in earnings of transmission affiliates 0.0 0.0 0.0 0.0
Interest expense 36.5 30.3 71.6 58.3
Reconciling Eliminations        
Segment information        
Other operation and maintenance 0.7 (100.4) 0.0 (197.2)
Depreciation and amortization (3.6) 0.0 (8.2) 0.0
Operating income (loss) (87.0) 0.0 (174.2) 0.0
Equity in earnings of transmission affiliates 0.0 0.0 0.0 0.0
Interest expense $ (89.1) (0.7) $ (178.6) (1.9)
ATC | Electric Transmission        
Segment information        
Equity method investment, ownership interest (as a percent) 60.00%   60.00%  
ATC Holdco        
Segment information        
Equity method investment, ownership interest (as a percent) 75.00%   75.00%  
Equity in earnings of transmission affiliates $ (0.5) (1.1) $ (0.9) (1.7)
ATC Holdco | Electric Transmission        
Segment information        
Equity method investment, ownership interest (as a percent) 75.00%   75.00%  
Bishop Hill III Wind Energy Center | Non-Utility Energy Infrastructure        
Segment information        
WEC's ownership interest in Bishop Hill III Wind Energy Center 90.00%   90.00%  
Coyote Ridge Wind | Non-Utility Energy Infrastructure        
Segment information        
WEC's ownership interest in Coyote Ridge Wind, LLC 80.00%   80.00%  
Upstream        
Segment information        
WEC's ownership interest in Upstream Wind Energy Center 80.00%   80.00%  
Upstream | Non-Utility Energy Infrastructure        
Segment information        
WEC's ownership interest in Upstream Wind Energy Center 80.00%   80.00%  
Total utility revenues        
Segment information        
Other operation and maintenance $ 494.3 631.4 $ 1,042.8 1,238.7
Depreciation and amortization 204.6 180.9 406.6 363.5
Operating income (loss) 317.4 244.9 858.6 702.4
Equity in earnings of transmission affiliates 0.0 0.0 0.0 0.0
Interest expense 158.5 62.9 319.0 126.7
Total utility revenues | Wisconsin        
Segment information        
Other operation and maintenance 363.9 502.4 756.6 970.9
Depreciation and amortization 152.9 134.6 303.9 269.7
Operating income (loss) 270.2 195.1 632.0 468.8
Equity in earnings of transmission affiliates 0.0 0.0 0.0 0.0
Interest expense 142.7 48.5 286.1 97.9
Total utility revenues | Illinois        
Segment information        
Other operation and maintenance 107.0 104.1 235.2 216.3
Depreciation and amortization 45.0 41.8 89.5 82.7
Operating income (loss) 42.6 41.7 180.5 189.3
Equity in earnings of transmission affiliates 0.0 0.0 0.0 0.0
Interest expense 13.9 12.3 28.7 24.6
Total utility revenues | Other States        
Segment information        
Other operation and maintenance 23.4 24.9 51.0 51.5
Depreciation and amortization 6.7 4.5 13.2 11.1
Operating income (loss) 4.6 8.1 46.1 44.3
Equity in earnings of transmission affiliates 0.0 0.0 0.0 0.0
Interest expense 1.9 2.1 4.2 4.2
External Revenues        
Segment information        
Operating revenues 1,590.2 1,672.5 3,967.6 3,959.0
External Revenues | Electric Transmission        
Segment information        
Operating revenues 0.0 0.0 0.0 0.0
External Revenues | Non-Utility Energy Infrastructure        
Segment information        
Operating revenues 24.3 3.5 44.9 22.3
External Revenues | Corporate and Other        
Segment information        
Operating revenues 0.9 3.1 2.6 4.5
External Revenues | Reconciling Eliminations        
Segment information        
Operating revenues 0.0 0.0 0.0 0.0
External Revenues | Total utility revenues        
Segment information        
Operating revenues 1,565.0 1,665.9 3,920.1 3,932.2
External Revenues | Total utility revenues | Wisconsin        
Segment information        
Operating revenues 1,253.3 1,325.5 2,886.7 2,914.6
External Revenues | Total utility revenues | Illinois        
Segment information        
Operating revenues 242.9 268.0 779.4 775.3
External Revenues | Total utility revenues | Other States        
Segment information        
Operating revenues 68.8 72.4 254.0 242.3
Intersegment Transactions [Member]        
Segment information        
Operating revenues 0.0 0.0 0.0 0.0
Intersegment Transactions [Member] | Electric Transmission        
Segment information        
Operating revenues 0.0 0.0 0.0 0.0
Intersegment Transactions [Member] | Non-Utility Energy Infrastructure        
Segment information        
Operating revenues 99.0 113.5 206.2 212.8
Intersegment Transactions [Member] | Corporate and Other        
Segment information        
Operating revenues 0.0 0.0 0.0 0.0
Intersegment Transactions [Member] | Reconciling Eliminations        
Segment information        
Operating revenues (99.0) (113.5) (206.2) (212.8)
Intersegment Transactions [Member] | Total utility revenues        
Segment information        
Operating revenues 0.0 0.0 0.0 0.0
Intersegment Transactions [Member] | Total utility revenues | Wisconsin        
Segment information        
Operating revenues 0.0 0.0 0.0 0.0
Intersegment Transactions [Member] | Total utility revenues | Illinois        
Segment information        
Operating revenues 0.0 0.0 0.0 0.0
Intersegment Transactions [Member] | Total utility revenues | Other States        
Segment information        
Operating revenues $ 0.0 $ 0.0 $ 0.0 $ 0.0