XML 115 R40.htm IDEA: XBRL DOCUMENT
v3.6.0.2

Summary of Significant Accounting Policies (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2016
Accounting Policies [Abstract] |
Schedule of inventory | Our inventory as of December 31 consisted of:
(in millions) |  | 2016 |  | 2015
Natural gas in storage |  | $ | 223.1 |  |  | $ | 284.1 |
Materials and supplies |  | 206.5 |  |  | 219.2 |
Fossil fuel |  | 158.0 |  |  | 183.7 |
Total |  | $ | 587.6 |  |  | $ | 687.0 |
Schedule of annual utility composite depreciation rates | Annual utility composite depreciation rates are shown below:
Annual Utility Composite Depreciation Rates |  | 2016 |  | 2015 |  | 2014
WE |  | 3.00% |  | 3.01% |  | 2.93%
WPS * |  | 2.58% |  | 1.30% |  | N/A
WG |  | 2.34% |  | 2.36% |  | 2.69%
PGL * |  | 3.31% |  | 1.67% |  | N/A
NSG * |  | 2.44% |  | 1.22% |  | N/A
MERC * |  | 2.53% |  | 1.26% |  | N/A
MGU * |  | 2.63% |  | 1.32% |  | N/A
* | The rates shown for 2015 are for a partial year as a result of the acquisition of Integrys. The full year rate would be approximately double the rate shown.
Schedule Of public utilities allowance for funds used during construction | Average AFUDC rates are shown below:
|  | 2016
|  | Average AFUDC Retail Rate |  | Average AFUDC Wholesale Rate
WE |  | 8.45% |  | 2.73%
WPS |  | 7.72% |  | 3.00%
WG |  | 8.33% |  | N/A
Allowance for funds used during construction | Our regulated utilities recorded the following AFUDC for the years ended December 31:
(in millions) |  | 2016 |  | 2015 |  | 2014
AFUDC – Debt |  | $ | 10.9 |  |  | $ | 8.6 |  |  | $ | 2.3 |
AFUDC – Equity |  | $ | 25.1 |  |  | $ | 20.1 |  |  | $ | 5.6 |
Schedule of assumptions used to estimate the fair value of stock options granted | The following table shows the estimated fair value per stock option granted along with the weighted-average assumptions used in the valuation models:
|  | 2016 |  | 2015 |  | 2014
Non-qualified stock options granted |  | 794,764 |  |  | 516,475 |  |  | 899,500 |
Estimated fair value per non-qualified stock option |  | $ | 5.14 |  |  | $ | 5.29 |  |  | $ | 4.18 |
Assumptions used to value the options: |  |  |  |  |  |
Risk-free interest rate |  | 0.4% – 2.2% |  |  | 0.1% – 2.1% |  |  | 0.1% – 3.0% |
Dividend yield |  | 4.0 | % |  | 3.7 | % |  | 3.8 | %
Expected volatility |  | 18.1 | % |  | 18.0 | % |  | 18.0 | %
Expected life (years) |  | 6.1 |  |  | 5.8 |  |  | 5.8 |

X
- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(c)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_ScheduleOfInventoryCurrentTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Allowance For Funds Used During Construction. + References No definition available. + Details
Name: | wec_AllowanceForFundsUsedDuringConstructionTextBlock
Namespace Prefix: | wec_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the annual utility composite depreciation rates of the entity. + References No definition available. + Details
Name: | wec_ScheduleOfAnnualUtilityCompositeDepreciationRateTableTextBlock
Namespace Prefix: | wec_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of information pertaining to allowance for funds used during construction (AFUDC) for utilities (for example, description of projects, computation, amounts, rates, accounting, recovery period, noncash income). Allowance for funds used during construction represents the estimated costs of debt and equity financings necessary to finance the construction of regulated assets. + References No definition available. + Details
Name: | wec_ScheduleOfPublicUtilitiesAllowanceForFundsUsedDuringConstructionTableTextBlock
Namespace Prefix: | wec_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration