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Guarantees (Details) $ in Millions	Dec. 31, 2017 USD ($)
Guarantor Obligations
Total guarantees	$ 83.8
Guarantees expiring in less than one year	73.0
Guarantees expiring within one to three years	0.4
Guarantees with expiration over three years	10.4
Guarantees supporting commodity transactions of subsidiaries
Guarantor Obligations
Total guarantees	8.1
Guarantees expiring in less than one year	8.1
Guarantees expiring within one to three years	0.0
Guarantees with expiration over three years	0.0
Guarantees supporting commodity transactions of subsidiaries | Non-Utility Energy Infrastructure
Guarantor Obligations
Total guarantees	8.1
Standby letters of credit
Guarantor Obligations
Total guarantees	55.1
Guarantees expiring in less than one year	54.7
Guarantees expiring within one to three years	0.4
Guarantees with expiration over three years	0.0
Surety bonds
Guarantor Obligations
Total guarantees	9.7
Guarantees expiring in less than one year	9.7
Guarantees expiring within one to three years	0.0
Guarantees with expiration over three years	0.0
Other guarantees
Guarantor Obligations
Total guarantees	10.9
Guarantees expiring in less than one year	0.5
Guarantees expiring within one to three years	0.0
Guarantees with expiration over three years	10.4
Other indemnification
Guarantor Obligations
Total guarantees	10.9
Liability related to workers compensation coverage	$ 10.4

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=82913245&loc=d3e12069-110248

+ Details

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Namespace Prefix:	us-gaap_
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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

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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=82913245&loc=d3e12069-110248

+ Details

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Balance Type:	credit
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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

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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

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Balance Type:	credit
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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

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- Details

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- Details

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X

- Details

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- Details

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- Details

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- Details

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