The period end amount owned by the reporting utility of a jointly owned utility plant in service.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 980
-SubTopic 360
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 10.C)
-URI http://asc.fasb.org/extlink&oid=115995737&loc=d3e659983-123033

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- 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.

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Balance Type:	na
Period Type:	duration

- Definition

The period end amount of construction work in progress at a jointly owned electricity generation plant.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The period end amount of accumulated depreciation in a jointly owned electricity generation plant.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The proportionate share of interest (percent) in a jointly owned utility plant.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The portion of the capacity of a solar project owned by the entity (in megawatts).

+ References

No definition available.

+ Details

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Namespace Prefix:	wec_
Data Type:	num:powerItemType
Balance Type:	na
Period Type:	instant

- Definition

Capacity of a solar project that approval was requested for from the PSCW.

+ References

No definition available.

+ Details

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Namespace Prefix:	wec_
Data Type:	num:powerItemType
Balance Type:	na
Period Type:	instant

- Definition

The future proportionate share of interest (percent) in Columbia as capital expenditures increase by Columbia and not WPS, through June 1, 2020

+ References

No definition available.

+ Details

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Namespace Prefix:	wec_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The entity's proportionate share of the rated capacity of a jointly owned utility plant.

+ References

No definition available.

+ Details

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Namespace Prefix:	wec_
Data Type:	num:powerItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of solar projects for which acquisition approval has been requested from a regulatory agency.

+ References

No definition available.

+ Details

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Namespace Prefix:	wec_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Details

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- Details

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Namespace Prefix:
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- Details

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- Details

Name:	dei_LegalEntityAxis=wec_WisconsinPublicServiceCorporationMember
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- Details

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- Details

Name:	us-gaap_JointlyOwnedUtilityPlantAxis=wec_ForwardWindEnergyCenterMember
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- Details

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Jointly Owned Utility Facilities (Details) $ in Millions	Dec. 31, 2019 USD ($) MW	Aug. 01, 2019 MW	May 31, 2018 solar_projects
Elm Road Generating Station Units 1 and 2 \| We Power
Jointly Owned Electric Generating Facilities
Ownership (as a percentage)	83.34%
Share of rated capacity (MW) (1) \| MW	1,054.3
Property, plant, and equipment	$ 2,447.9
Accumulated depreciation	(416.1)
Construction Work in Progress	$ 0.8
Weston 4 \| WPS
Jointly Owned Electric Generating Facilities
Ownership (as a percentage)	70.00%
Share of rated capacity (MW) (1) \| MW	386.0
Property, plant, and equipment	$ 663.2
Accumulated depreciation	(232.4)
Construction Work in Progress	$ 5.3
Columbia Energy Center Units 1 and 2 \| WPS
Jointly Owned Electric Generating Facilities
Future Ownership Interest of Columbia	27.50%
Ownership (as a percentage)	27.60%
Share of rated capacity (MW) (1) \| MW	313.9
Property, plant, and equipment	$ 422.3
Accumulated depreciation	(129.5)
Construction Work in Progress	$ 1.8
Forward Wind Energy Center \| WPS
Jointly Owned Electric Generating Facilities
Ownership (as a percentage)	44.60%
Share of rated capacity (MW) (1) \| MW	8.4
Property, plant, and equipment	$ 118.7
Accumulated depreciation	(46.4)
Construction Work in Progress	$ 0.1
Badger Hollow and Two Creeks Solar Farms \| WPS
Jointly Owned Electric Generating Facilities
Number Of Solar Projects Acquisition Approval Requested \| solar_projects			2
Capacity Of Solar Project Owned By Entity \| MW	200
Badger Hollow Solar Farm I \| WPS
Jointly Owned Electric Generating Facilities
Construction Work in Progress	$ 32.5
Capacity Of Solar Project Owned By Entity \| MW	100
Two Creeks Solar Project \| WPS
Jointly Owned Electric Generating Facilities
Construction Work in Progress	$ 87.3
Capacity Of Solar Project Owned By Entity \| MW	100
Badger Hollow Solar Farm II \| WE
Jointly Owned Electric Generating Facilities
Capacity of Solar Project Approval Was Requested for from the PSCW \| MW		100