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v3.8.0.1

Segment Information (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) segment | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Segment information |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | segment |  |  |  |  |  |  |  |  | 6 |  |
Revenues | $ 2,055.0 | $ 1,657.5 | $ 1,631.5 | $ 2,304.5 | $ 1,963.0 | $ 1,712.5 | $ 1,602.0 | $ 2,194.8 | $ 7,648.5 | $ 7,472.3 | $ 5,926.1
Other operation and maintenance |  |  |  |  |  |  |  |  | 2,047.0 | 2,185.5 | 1,709.3
Depreciation and amortization |  |  |  |  |  |  |  |  | 798.6 | 762.6 | 561.8
Operating income (loss) | 412.1 | $ 393.6 | $ 362.2 | $ 617.3 | 361.7 | $ 399.0 | $ 332.1 | $ 589.3 | 1,785.2 | 1,682.1 | 1,250.5
Equity in earnings of transmission affiliates |  |  |  |  |  |  |  |  | 154.3 | 146.5 | 96.1
Interest expense |  |  |  |  |  |  |  |  | 415.7 | 402.7 | 331.4
Capital expenditures |  |  |  |  |  |  |  |  | 1,959.5 | 1,423.7 | 1,266.2
Total assets | 31,590.5 |  |  |  | 30,123.2 |  |  |  | 31,590.5 | 30,123.2 | 29,355.2
Intersegment revenues |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Electric transmission |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Other operation and maintenance |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Depreciation and amortization |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Operating income (loss) |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Equity in earnings of transmission affiliates |  |  |  |  |  |  |  |  | 154.3 | 146.5 | 96.1
Interest expense |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Capital expenditures |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Total assets | 1,593.4 |  |  |  | 1,476.9 |  |  |  | 1,593.4 | 1,476.9 | 1,381.0
Electric transmission | Intersegment revenues |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Non-Utility Energy Infrastructure |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 38.9 | 24.9 | 40.0
Other operation and maintenance |  |  |  |  |  |  |  |  | 7.3 | 4.3 | 4.3
Depreciation and amortization |  |  |  |  |  |  |  |  | 71.4 | 68.3 | 67.5
Operating income (loss) |  |  |  |  |  |  |  |  | 400.5 | 375.6 | 373.4
Equity in earnings of transmission affiliates |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Interest expense |  |  |  |  |  |  |  |  | 62.8 | 62.1 | 63.4
Capital expenditures |  |  |  |  |  |  |  |  | 35.4 | 62.3 | 53.4
Total assets | 2,992.8 |  |  |  | 2,777.1 |  |  |  | 2,992.8 | 2,777.1 | 2,779.0
Non-Utility Energy Infrastructure | Intersegment revenues |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 446.3 | 423.3 | 405.2
Corporate and other |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 13.7 | 23.3 | 47.3
Other operation and maintenance |  |  |  |  |  |  |  |  | (4.1) | (15.8) | 103.7
Depreciation and amortization |  |  |  |  |  |  |  |  | 25.9 | 42.6 | 12.4
Operating income (loss) |  |  |  |  |  |  |  |  | (8.4) | (10.0) | (91.2)
Equity in earnings of transmission affiliates |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Interest expense |  |  |  |  |  |  |  |  | 107.3 | 120.9 | 91.0
Capital expenditures |  |  |  |  |  |  |  |  | 152.1 | 97.8 | 33.4
Total assets | 953.6 |  |  |  | 778.0 |  |  |  | 953.6 | 778.0 | 1,132.5
Corporate and other | Intersegment revenues |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Reconciling eliminations |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Other operation and maintenance |  |  |  |  |  |  |  |  | (441.1) | (423.6) | (409.3)
Depreciation and amortization |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Operating income (loss) |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Equity in earnings of transmission affiliates |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Interest expense |  |  |  |  |  |  |  |  | (1.8) | (8.6) | (5.1)
Capital expenditures |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Total assets | (3,398.9) |  |  |  | (3,349.2) |  |  |  | (3,398.9) | (3,349.2) | (3,431.7)
Reconciling eliminations | WE |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Total assets | 2,038.1 |  |  |  | 2,029.5 |  |  |  | 2,038.1 | 2,029.5 | 2,105.3
Reconciling eliminations | Intersegment revenues |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | (446.3) | (423.6) | (410.2)
Public Utility |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 7,595.9 | 7,424.1 | 5,838.8
Other operation and maintenance |  |  |  |  |  |  |  |  | 2,484.9 | 2,620.6 | 2,010.6
Depreciation and amortization |  |  |  |  |  |  |  |  | 701.3 | 651.7 | 481.9
Operating income (loss) |  |  |  |  |  |  |  |  | 1,393.1 | 1,316.5 | 968.3
Equity in earnings of transmission affiliates |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Interest expense |  |  |  |  |  |  |  |  | 247.4 | 228.3 | 182.1
Capital expenditures |  |  |  |  |  |  |  |  | 1,772.0 | 1,263.6 | 1,179.4
Total assets | 29,449.6 |  |  |  | 28,440.4 |  |  |  | 29,449.6 | 28,440.4 | 27,494.4
Public Utility | Intersegment revenues |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 0.0 | 0.3 | 5.0
Public Utility | Wisconsin |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 5,829.2 | 5,805.4 | 5,186.1
Other operation and maintenance |  |  |  |  |  |  |  |  | 1,912.5 | 2,025.4 | 1,741.0
Depreciation and amortization |  |  |  |  |  |  |  |  | 523.9 | 496.6 | 408.6
Operating income (loss) |  |  |  |  |  |  |  |  | 1,065.9 | 1,027.0 | 884.2
Equity in earnings of transmission affiliates |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Interest expense |  |  |  |  |  |  |  |  | 193.7 | 180.9 | 157.1
Capital expenditures |  |  |  |  |  |  |  |  | 1,152.3 | 910.9 | 950.3
Total assets | 22,237.1 |  |  |  | 21,730.7 |  |  |  | 22,237.1 | 21,730.7 | 21,113.5
Public Utility | Wisconsin | Intersegment revenues |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 0.0 | 0.3 | 5.0
Public Utility | Illinois |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 1,355.5 | 1,242.2 | 503.4
Other operation and maintenance |  |  |  |  |  |  |  |  | 471.1 | 485.1 | 219.6
Depreciation and amortization |  |  |  |  |  |  |  |  | 152.6 | 134.0 | 63.3
Operating income (loss) |  |  |  |  |  |  |  |  | 273.0 | 239.6 | 78.1
Equity in earnings of transmission affiliates |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Interest expense |  |  |  |  |  |  |  |  | 45.0 | 38.9 | 19.9
Capital expenditures |  |  |  |  |  |  |  |  | 545.2 | 293.2 | 194.4
Total assets | 6,144.7 |  |  |  | 5,714.6 |  |  |  | 6,144.7 | 5,714.6 | 5,462.9
Public Utility | Illinois | Intersegment revenues |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Public Utility | Other States |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 411.2 | 376.5 | 149.3
Other operation and maintenance |  |  |  |  |  |  |  |  | 101.3 | 110.1 | 50.0
Depreciation and amortization |  |  |  |  |  |  |  |  | 24.8 | 21.1 | 10.0
Operating income (loss) |  |  |  |  |  |  |  |  | 54.2 | 49.9 | 6.0
Equity in earnings of transmission affiliates |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Interest expense |  |  |  |  |  |  |  |  | 8.7 | 8.5 | 5.1
Capital expenditures |  |  |  |  |  |  |  |  | 74.5 | 59.5 | 34.7
Total assets | $ 1,067.8 |  |  |  | $ 995.1 |  |  |  | 1,067.8 | 995.1 | 918.0
Public Utility | Other States | Intersegment revenues |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 0.0 | 0.0 | 0.0
ATC |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership interest (as a percent) | 60.00% |  |  |  |  |  |  |  | 60.00% |  |
Equity in earnings of transmission affiliates |  |  |  |  |  |  |  |  | $ 166.0 | $ 146.5 | $ 96.1

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