XML 179 R104.htm IDEA: XBRL DOCUMENT
v3.6.0.2

Guarantees (Details) $ in Millions | Dec. 31, 2016 USD ($)
--- | ---
Guarantor Obligations |
Total guarantees | $ 47.9
Guarantees expiring in less than one year | 38.7
Guarantees expiring within one to three years | 2.1
Guarantees with expiration over three years | 7.1
Standby letters of credit |
Guarantor Obligations |
Total guarantees | 29.4
Guarantees expiring in less than one year | 27.9
Guarantees expiring within one to three years | 1.5
Guarantees with expiration over three years | 0.0
Surety bonds |
Guarantor Obligations |
Total guarantees | 10.9
Guarantees expiring in less than one year | 10.3
Guarantees expiring within one to three years | 0.6
Guarantees with expiration over three years | 0.0
Other guarantees |
Guarantor Obligations |
Total guarantees | 7.6
Guarantees expiring in less than one year | 0.5
Guarantees expiring within one to three years | 0.0
Guarantees with expiration over three years | 7.1
Other indemnification |
Guarantor Obligations |
Total guarantees | 7.6
Liability related to workers compensation coverage | $ 7.1

X
- Definition The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 + Details
Name: | us-gaap_GuaranteeObligationsCurrentCarryingValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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_GuaranteeObligationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 + Details
Name: | us-gaap_GuaranteeObligationsMaximumExposure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the maximum potential payments with respect to the entity's guarantees that expire in less than a year. + References No definition available. + Details
Name: | wec_GuaranteeObligationsMaximumExposureExpireLessThanOneYear
Namespace Prefix: | wec_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the maximum potential payments with respect to the entity's guarantees that expire after three years. + References No definition available. + Details
Name: | wec_GuaranteeObligationsMaximumExposureExpireOverThreeYears
Namespace Prefix: | wec_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the maximum potential payments with respect to the entity's guarantees that expire within one to three years. + References No definition available. + Details
Name: | wec_GuaranteeObligationsMaximumExposureExpireWithinOneToThreeYears
Namespace Prefix: | wec_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_GuaranteeObligationsByNatureAxis=us-gaap_StandbyLettersOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_GuaranteeObligationsByNatureAxis=us-gaap_SuretyBondMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_GuaranteeObligationsByNatureAxis=us-gaap_GuaranteeTypeOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_GuaranteeObligationsByNatureAxis=us-gaap_IndemnificationGuaranteeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |