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Segment Information (Tables) | 12 Months Ended
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Dec. 31, 2017
Segment Reporting [Abstract] |
Schedule of information concerning our reportable segments | The following tables show summarized financial information related to our reportable segments for the years ended December 31, 2017, 2016, and 2015.
|  | Utility Operations |  |  |  |  |  |  |  |  |  |
2017 (in millions) |  | Wisconsin |  | Illinois |  | Other States |  | Total Utility Operations |  | Electric Transmission |  | Non-Utility Energy Infrastructure |  | Corporate and Other |  | Reconciling Eliminations |  | WEC Energy Group Consolidated
External revenues |  | $ | 5,829.2 |  |  | $ | 1,355.5 |  |  | $ | 411.2 |  |  | $ | 7,595.9 |  |  | $ | — |  |  | $ | 38.9 |  |  | $ | 13.7 |  |  | $ | — |  |  | $ | 7,648.5 |
Intersegment revenues |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 446.3 |  |  | — |  |  | (446.3 | ) |  | — |
Other operation and maintenance |  | 1,912.5 |  |  | 471.1 |  |  | 101.3 |  |  | 2,484.9 |  |  | — |  |  | 7.3 |  |  | (4.1 | ) |  | (441.1 | ) |  | 2,047.0 |
Depreciation and amortization |  | 523.9 |  |  | 152.6 |  |  | 24.8 |  |  | 701.3 |  |  | — |  |  | 71.4 |  |  | 25.9 |  |  | — |  |  | 798.6 |
Operating income (loss) |  | 1,065.9 |  |  | 273.0 |  |  | 54.2 |  |  | 1,393.1 |  |  | — |  |  | 400.5 |  |  | (8.4 | ) |  | — |  |  | 1,785.2 |
Equity in earnings of transmission affiliates |  | — |  |  | — |  |  | — |  |  | — |  |  | 154.3 |  |  | — |  |  | — |  |  | — |  |  | 154.3 |
Interest expense |  | 193.7 |  |  | 45.0 |  |  | 8.7 |  |  | 247.4 |  |  | — |  |  | 62.8 |  |  | 107.3 |  |  | (1.8 | ) |  | 415.7 |
Capital expenditures |  | 1,152.3 |  |  | 545.2 |  |  | 74.5 |  |  | 1,772.0 |  |  | — |  |  | 35.4 |  |  | 152.1 |  |  | — |  |  | 1,959.5 |
Total assets * |  | 22,237.1 |  |  | 6,144.7 |  |  | 1,067.8 |  |  | 29,449.6 |  |  | 1,593.4 |  |  | 2,992.8 |  |  | 953.6 |  |  | (3,398.9 | ) |  | 31,590.5 |
* | Total assets at December 31, 2017 reflect an elimination of $2,038.1 million for all lease activity between We Power and WE.
|  | Utility Operations |  |  |  |  |  |  |  |  |  |
2016 (in millions) |  | Wisconsin |  | Illinois |  | Other States |  | Total Utility Operations |  | Electric Transmission |  | Non-Utility Energy Infrastructure |  | Corporate and Other |  | Reconciling Eliminations |  | WEC Energy Group Consolidated
External revenues |  | $ | 5,805.4 |  |  | $ | 1,242.2 |  |  | $ | 376.5 |  |  | $ | 7,424.1 |  |  | $ | — |  |  | $ | 24.9 |  |  | $ | 23.3 |  |  | $ | — |  |  | $ | 7,472.3 |
Intersegment revenues |  | 0.3 |  |  | — |  |  | — |  |  | 0.3 |  |  | — |  |  | 423.3 |  |  | — |  |  | (423.6 | ) |  | — |
Other operation and maintenance |  | 2,025.4 |  |  | 485.1 |  |  | 110.1 |  |  | 2,620.6 |  |  | — |  |  | 4.3 |  |  | (15.8 | ) |  | (423.6 | ) |  | 2,185.5 |
Depreciation and amortization |  | 496.6 |  |  | 134.0 |  |  | 21.1 |  |  | 651.7 |  |  | — |  |  | 68.3 |  |  | 42.6 |  |  | — |  |  | 762.6 |
Operating income (loss) |  | 1,027.0 |  |  | 239.6 |  |  | 49.9 |  |  | 1,316.5 |  |  | — |  |  | 375.6 |  |  | (10.0 | ) |  | — |  |  | 1,682.1 |
Equity in earnings of transmission affiliates |  | — |  |  | — |  |  | — |  |  | — |  |  | 146.5 |  |  | — |  |  | — |  |  | — |  |  | 146.5 |
Interest expense |  | 180.9 |  |  | 38.9 |  |  | 8.5 |  |  | 228.3 |  |  | — |  |  | 62.1 |  |  | 120.9 |  |  | (8.6 | ) |  | 402.7 |
Capital expenditures |  | 910.9 |  |  | 293.2 |  |  | 59.5 |  |  | 1,263.6 |  |  | — |  |  | 62.3 |  |  | 97.8 |  |  | — |  |  | 1,423.7 |
Total assets * |  | 21,730.7 |  |  | 5,714.6 |  |  | 995.1 |  |  | 28,440.4 |  |  | 1,476.9 |  |  | 2,777.1 |  |  | 778.0 |  |  | (3,349.2 | ) |  | 30,123.2 |
* | Total assets at December 31, 2016 reflect an elimination of $2,029.5 million for all lease activity between We Power and WE.
|  | Utility Operations |  |  |  |  |  |  |  |  |  |
2015 (in millions) |  | Wisconsin |  | Illinois |  | Other States |  | Total Utility Operations |  | Electric Transmission |  | Non-Utility Energy Infrastructure |  | Corporate and Other |  | Reconciling Eliminations |  | WEC Energy Group Consolidated
External revenues |  | $ | 5,186.1 |  |  | $ | 503.4 |  |  | $ | 149.3 |  |  | $ | 5,838.8 |  |  | $ | — |  |  | $ | 40.0 |  |  | $ | 47.3 |  |  | $ | — |  |  | $ | 5,926.1 |
Intersegment revenues |  | 5.0 |  |  | — |  |  | — |  |  | 5.0 |  |  | — |  |  | 405.2 |  |  | — |  |  | (410.2 | ) |  | — |
Other operation and maintenance |  | 1,741.0 |  |  | 219.6 |  |  | 50.0 |  |  | 2,010.6 |  |  | — |  |  | 4.3 |  |  | 103.7 |  |  | (409.3 | ) |  | 1,709.3 |
Depreciation and amortization |  | 408.6 |  |  | 63.3 |  |  | 10.0 |  |  | 481.9 |  |  | — |  |  | 67.5 |  |  | 12.4 |  |  | — |  |  | 561.8 |
Operating income (loss) |  | 884.2 |  |  | 78.1 |  |  | 6.0 |  |  | 968.3 |  |  | — |  |  | 373.4 |  |  | (91.2 | ) |  | — |  |  | 1,250.5 |
Equity in earnings of transmission affiliates |  | — |  |  | — |  |  | — |  |  | — |  |  | 96.1 |  |  | — |  |  | — |  |  | — |  |  | 96.1 |
Interest expense |  | 157.1 |  |  | 19.9 |  |  | 5.1 |  |  | 182.1 |  |  | — |  |  | 63.4 |  |  | 91.0 |  |  | (5.1 | ) |  | 331.4 |
Capital expenditures |  | 950.3 |  |  | 194.4 |  |  | 34.7 |  |  | 1,179.4 |  |  | — |  |  | 53.4 |  |  | 33.4 |  |  | — |  |  | 1,266.2 |
Total assets * |  | 21,113.5 |  |  | 5,462.9 |  |  | 918.0 |  |  | 27,494.4 |  |  | 1,381.0 |  |  | 2,779.0 |  |  | 1,132.5 |  |  | (3,431.7 | ) |  | 29,355.2 |
* | Total assets at December 31, 2015 reflect an elimination of $2,105.3 million for all lease activity between We Power and WE.

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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8813-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8721-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8736-108599 + Details
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