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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

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