XML 80 R67.htm IDEA: XBRL DOCUMENT
v3.8.0.1

SEGMENT INFORMATION (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) segment | Sep. 30, 2016 USD ($)
Segment information |  |  |  |
Number of reportable segments | segment |  |  | 6 |
Revenues | $ 1,657.5 | $ 1,712.5 | $ 5,593.5 | $ 5,509.3
Other operation and maintenance | 471.7 | 517.5 | 1,453.4 | 1,571.0
Depreciation and amortization | 201.2 | 191.6 | 593.5 | 569.5
Operating income (loss) | 393.6 | 399.0 | 1,373.1 | 1,320.4
Equity in earnings of transmission affiliate | 39.2 | 38.3 | 122.9 | 107.7
Interest expense | 103.8 | 99.1 | 310.4 | 300.1
Intersegment revenues |  |  |  |
Segment information |  |  |  |
Revenues | 0.0 | 0.0 | 0.0 | 0.0
Electric Transmission |  |  |  |
Segment information |  |  |  |
Revenues | 0.0 | 0.0 | 0.0 | 0.0
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 affiliate | 39.2 | 38.3 | 122.9 | 107.7
Interest expense | 0.0 | 0.0 | 0.0 | 0.0
Electric Transmission | Intersegment revenues |  |  |  |
Segment information |  |  |  |
Revenues | 0.0 | 0.0 | 0.0 | 0.0
Non-Utility Energy Infrastructure |  |  |  |
Segment information |  |  |  |
Revenues | 13.6 | 6.2 | 26.1 | 18.7
Other operation and maintenance | 1.5 | 0.4 | 4.6 | 3.5
Depreciation and amortization | 18.2 | 17.1 | 53.1 | 51.1
Operating income (loss) | 103.4 | 93.7 | 299.5 | 281.1
Equity in earnings of transmission affiliate | 0.0 | 0.0 | 0.0 | 0.0
Interest expense | 16.2 | 15.6 | 46.7 | 46.8
Non-Utility Energy Infrastructure | Intersegment revenues |  |  |  |
Segment information |  |  |  |
Revenues | 111.6 | 105.0 | 333.2 | 317.1
Corporate and Other |  |  |  |
Segment information |  |  |  |
Revenues | 5.6 | 4.0 | 11.7 | 20.3
Other operation and maintenance | (1.5) | (3.2) | (0.3) | (13.0)
Depreciation and amortization | 6.3 | 11.3 | 18.3 | 33.4
Operating income (loss) | 1.1 | (4.5) | (6.3) | (6.4)
Equity in earnings of transmission affiliate | 0.0 | 0.0 | 0.0 | 0.0
Interest expense | 25.4 | 29.7 | 81.3 | 91.2
Corporate and Other | Intersegment revenues |  |  |  |
Segment information |  |  |  |
Revenues | 0.0 | 0.0 | 0.0 | 0.0
Reconciling Eliminations |  |  |  |
Segment information |  |  |  |
Revenues | 0.0 | 0.0 | 0.0 | 0.0
Other operation and maintenance | (109.0) | (105.0) | (330.6) | (317.4)
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 affiliate | 0.0 | 0.0 | 0.0 | 0.0
Interest expense | 0.4 | (2.0) | (2.5) | (6.7)
Reconciling Eliminations | Intersegment revenues |  |  |  |
Segment information |  |  |  |
Revenues | (111.6) | (105.0) | (333.2) | (317.4)
Public Utility |  |  |  |
Segment information |  |  |  |
Revenues | 1,638.3 | 1,702.3 | 5,555.7 | 5,470.3
Other operation and maintenance | 580.7 | 625.3 | 1,779.7 | 1,897.9
Depreciation and amortization | 176.7 | 163.2 | 522.1 | 485.0
Operating income (loss) | 289.1 | 309.8 | 1,079.9 | 1,045.7
Equity in earnings of transmission affiliate | 0.0 | 0.0 | 0.0 | 0.0
Interest expense | 61.8 | 55.8 | 184.9 | 168.8
Public Utility | Intersegment revenues |  |  |  |
Segment information |  |  |  |
Revenues | 0.0 | 0.0 | 0.0 | 0.3
Public Utility | Wisconsin |  |  |  |
Segment information |  |  |  |
Revenues | 1,401.3 | 1,470.6 | 4,316.6 | 4,354.9
Other operation and maintenance | 458.3 | 498.2 | 1,379.9 | 1,477.3
Depreciation and amortization | 131.5 | 124.5 | 391.1 | 370.1
Operating income (loss) | 279.7 | 299.1 | 835.6 | 841.3
Equity in earnings of transmission affiliate | 0.0 | 0.0 | 0.0 | 0.0
Interest expense | 48.5 | 44.6 | 145.4 | 133.5
Public Utility | Wisconsin | Intersegment revenues |  |  |  |
Segment information |  |  |  |
Revenues | 0.0 | 0.0 | 0.0 | 0.3
Public Utility | Illinois |  |  |  |
Segment information |  |  |  |
Revenues | 187.2 | 181.8 | 965.7 | 853.1
Other operation and maintenance | 100.8 | 105.9 | 326.6 | 340.0
Depreciation and amortization | 38.9 | 33.5 | 112.6 | 99.4
Operating income (loss) | 12.5 | 11.7 | 209.3 | 171.3
Equity in earnings of transmission affiliate | 0.0 | 0.0 | 0.0 | 0.0
Interest expense | 11.0 | 9.3 | 33.0 | 28.8
Public Utility | Illinois | Intersegment revenues |  |  |  |
Segment information |  |  |  |
Revenues | 0.0 | 0.0 | 0.0 | 0.0
Public Utility | Other States |  |  |  |
Segment information |  |  |  |
Revenues | 49.8 | 49.9 | 273.4 | 262.3
Other operation and maintenance | 21.6 | 21.2 | 73.2 | 80.6
Depreciation and amortization | 6.3 | 5.2 | 18.4 | 15.5
Operating income (loss) | (3.1) | (1.0) | 35.0 | 33.1
Equity in earnings of transmission affiliate | 0.0 | 0.0 | 0.0 | 0.0
Interest expense | 2.3 | 1.9 | 6.5 | 6.5
Public Utility | Other States | Intersegment revenues |  |  |  |
Segment information |  |  |  |
Revenues | $ 0.0 | 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 affiliate | $ 39.2 | $ 38.3 | $ 122.9 | $ 107.7
ATC | Electric Transmission |  |  |  |
Segment information |  |  |  |
Equity method investment, ownership interest (as a percent) | 60.00% |  | 60.00% |

X
- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
Name: | us-gaap_DepreciationDepletionAndAmortization
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + Details
Name: | us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(12)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(10)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66022249&loc=d3e33749-111570 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(13)(f)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
Name: | us-gaap_IncomeLossFromEquityMethodInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of the cost of borrowed funds accounted for as interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.9) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
Name: | us-gaap_InterestExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The net result for the period of deducting operating expenses from operating revenues. + References No definition available. + Details
Name: | us-gaap_OperatingIncomeLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The total amount of other operating cost and expense items that are associated with the entity's normal revenue producing operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
Name: | us-gaap_OtherCostAndExpenseOperating
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
Name: | us-gaap_Revenues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | wec_ConsolidationItemAxis=wec_IntersegmentTransactionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=wec_ElectricTransmissionSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=wec_NonUtilityEnergyInfrastructureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=us-gaap_CorporateAndOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=us-gaap_IntersegmentEliminationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=wec_PublicUtilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=wec_WisconsinMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=wec_IllinoisMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=wec_OtherStatesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=wec_TransmissionAffiliateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |