XML 113 R99.htm IDEA: XBRL DOCUMENT
v3.20.4

Property, Plant, and Equipment - Balances (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Property, plant, and equipment |  |
Accumulated depreciation | $ 9,364.7 | $ 8,878.7
Net property, plant, and equipment | 25,707.4 | 23,620.1
Costs incurred for repairs and restorations | 35.2 |
Insurance proceeds received to cover damage to the PSB building | 20.0 |
Accounts receivable recorded for future insurance recoveries | 2.7 |
PSB building repair and restoration costs in other operation and maintenance expense | 12.5 |
Regulated operations |  |
Property, plant, and equipment |  |
Accumulated depreciation | 8,465.0 | 8,073.7
Net | 20,631.9 | 19,102.6
CWIP | 683.9 | 820.4
Net property, plant, and equipment | 21,315.8 | 19,923.0
Regulated operations | Electric - generation |  |
Property, plant, and equipment |  |
Property, plant, and equipment | 7,015.3 | 6,858.8
Regulated operations | Electric - distribution |  |
Property, plant, and equipment |  |
Property, plant, and equipment | 7,455.5 | 7,018.1
Regulated operations | Natural gas - distribution, storage, and transmission |  |
Property, plant, and equipment |  |
Property, plant, and equipment | 12,730.0 | 11,602.7
Regulated operations | Other |  |
Property, plant, and equipment |  |
Property, plant, and equipment | 1,896.1 | 1,696.7
Non-regulated operations |  |
Property, plant, and equipment |  |
Accumulated depreciation | 899.7 | 805.0
Net | 4,056.5 | 3,672.3
CWIP | 335.1 | 24.8
Net property, plant, and equipment | 4,391.6 | 3,697.1
Non-regulated operations | Other |  |
Property, plant, and equipment |  |
Property, plant, and equipment | 41.8 | 88.8
Non-regulated operations | We Power generation |  |
Property, plant, and equipment |  |
Property, plant, and equipment | 3,238.8 | 3,245.7
Non-regulated operations | Renewable generation |  |
Property, plant, and equipment |  |
Property, plant, and equipment | 1,213.3 | 716.5
Non-regulated operations | Natural gas storage |  |
Property, plant, and equipment |  |
Property, plant, and equipment | 250.0 | 245.9
Non-regulated operations | Corporate services |  |
Property, plant, and equipment |  |
Property, plant, and equipment | 212.3 | 180.4
Non-Utility Energy Infrastructure | Non-regulated operations |  |
Property, plant, and equipment |  |
Property, plant, and equipment | $ 4,702.1 | $ 4,208.1

X
- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
Name: | us-gaap_ConstructionInProgressGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(14)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(8)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_PropertyPlantAndEquipmentNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Total costs incurred for repairs and restorations. Includes costs that were capitalized and expensed. + References No definition available. + Details
Name: | wec_CostsIncurredForRepairsAndRestorations
Namespace Prefix: | wec_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of insurance proceeds received to cover the damage to the PSB Building + References No definition available. + Details
Name: | wec_InsuranceProceedsReceivedToCoverDamageToPSBBuilding
Namespace Prefix: | wec_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of PSB building repair and restoration costs in other operation and maintenance expense + References No definition available. + Details
Name: | wec_PSBBuildingRepairAndRestorationCostsInOtherOperationAndMaintenanceExpense
Namespace Prefix: | wec_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Gross amount of long-lived physical assets used in the normal conduct of business and not intended for resale. Amount excludes construction work in progress. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | wec_PropertyPlantAndEquipmentGrossExcludingConstructionWorkInProgress
Namespace Prefix: | wec_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Long-lived physical assets that are held by an entity, excluding construction work in progress, for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. + References No definition available. + Details
Name: | wec_PropertyPlantAndEquipmentNetExcludingConstructionWorkInProgress
Namespace Prefix: | wec_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of accounts receivable recorded for future insurance recoveries + References No definition available. + Details
Name: | wec_ReceivableRecordedForFutureInsuranceRecoveries
Namespace Prefix: | wec_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_PublicUtilityRegulatedOrUnregulatedStatusAxis=us-gaap_RegulatedOperationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_ElectricGenerationEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_ElectricDistributionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=wec_NaturalGasStorageTransportationandDistributionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_PropertyPlantAndEquipmentOtherTypesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilityRegulatedOrUnregulatedStatusAxis=us-gaap_UnregulatedOperationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=wec_WePowerGeneratingFacilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=wec_RenewableGenerationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=wec_NaturalGasStorageEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=wec_CorporateServicesEquipmentMember
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: |