XML 77 R65.htm IDEA: XBRL DOCUMENT
v3.25.3

CREDIT LOSSES - GROSS RECEIVABLES AND RELATED ALLOWANCES (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Jun. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Accounts receivable and unbilled revenues | $ 1,399.0 |  | $ 1,832.1 |  |  |
Allowance for credit losses | 129.5 | $ 142.2 | 162.8 | $ 155.0 | $ 166.9 | $ 193.5
Accounts receivable and unbilled revenues, net | 1,269.5 |  | 1,669.3 |  |  |
Total accounts receivable, net - past due greater than 90 days | $ 112.5 |  | $ 84.4 |  |  |
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms | 91.70% |  | 93.20% |  |  |
Amount of net accounts receivable with regulatory protections | $ 838.9 |  |  |  |  |
Percent of net accounts receivable with regulatory protections | 66.10% |  |  |  |  |
Public Utilities |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Accounts receivable and unbilled revenues | $ 1,350.7 |  | $ 1,786.1 |  |  |
Allowance for credit losses | 129.5 |  | 162.8 |  |  |
Accounts receivable and unbilled revenues, net | 1,221.2 |  | 1,623.3 |  |  |
Total accounts receivable, net - past due greater than 90 days | $ 112.5 |  | $ 84.4 |  |  |
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms | 91.70% |  | 93.20% |  |  |
Wisconsin | Public Utilities |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Accounts receivable and unbilled revenues | $ 893.9 |  | $ 1,149.9 |  |  |
Allowance for credit losses | 48.7 | 52.3 | 73.6 | 63.9 | 68.7 | 77.4
Accounts receivable and unbilled revenues, net | 845.2 |  | 1,076.3 |  |  |
Total accounts receivable, net - past due greater than 90 days | $ 49.6 |  | $ 51.8 |  |  |
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms | 93.90% |  | 93.80% |  |  |
Illinois | Public Utilities |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Accounts receivable and unbilled revenues | $ 402.4 |  | $ 535.6 |  |  |
Allowance for credit losses | 76.6 | 84.6 | 83.9 | 86.9 | 93.2 | 109.7
Accounts receivable and unbilled revenues, net | 325.8 |  | 451.7 |  |  |
Total accounts receivable, net - past due greater than 90 days | $ 56.6 |  | $ 30.1 |  |  |
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms | 100.00% |  | 100.00% |  |  |
Other States | Public Utilities |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Accounts receivable and unbilled revenues | $ 54.4 |  | $ 100.6 |  |  |
Allowance for credit losses | 4.2 | $ 5.3 | 5.3 | $ 4.2 | $ 5.0 | $ 6.4
Accounts receivable and unbilled revenues, net | 50.2 |  | 95.3 |  |  |
Total accounts receivable, net - past due greater than 90 days | $ 6.3 |  | $ 2.5 |  |  |
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms | 0.00% |  | 0.00% |  |  |
Non-Utility Energy Infrastructure |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Accounts receivable and unbilled revenues | $ 40.8 |  | $ 40.0 |  |  |
Allowance for credit losses | 0.0 |  | 0.0 |  |  |
Accounts receivable and unbilled revenues, net | 40.8 |  | 40.0 |  |  |
Total accounts receivable, net - past due greater than 90 days | $ 0.0 |  | $ 0.0 |  |  |
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms | 0.00% |  | 0.00% |  |  |
Corporate and Other |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Accounts receivable and unbilled revenues | $ 7.5 |  | $ 6.0 |  |  |
Allowance for credit losses | 0.0 |  | 0.0 |  |  |
Accounts receivable and unbilled revenues, net | 7.5 |  | 6.0 |  |  |
Total accounts receivable, net - past due greater than 90 days | $ 0.0 |  | $ 0.0 |  |  |
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms | 0.00% |  | 0.00% |  |  |

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 Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 310 -SubTopic 20 -Name Accounting Standards Codification -Section 40 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481628/310-20-40-7 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481990/310-10-45-2 + Details
Name: | us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482736/825-10-45-1A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481990/310-10-45-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481990/310-10-45-13 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(5)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)(a)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_AccountsReceivableGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 946 -SubTopic 310 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477802/946-310-45-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(5)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(5)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479170/946-210-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 954 -SubTopic 310 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479196/954-310-45-1 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(3)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
Name: | us-gaap_AccountsReceivableNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of allowance for credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(5)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-1 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-4 + Details
Name: | us-gaap_AllowanceForDoubtfulAccountsReceivable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of accounts receivable past due greater than 90 days + References No definition available. + Details
Name: | wec_AccountsReceivablePastDueGreaterthan90Days
Namespace Prefix: | wec_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of net accounts receivable and unbilled revenues with regulatory protections in place to mitigate the exposure to credit losses + References No definition available. + Details
Name: | wec_Amountofnetaccountsreceivablewithregulatoryprotections
Namespace Prefix: | wec_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Percent of accounts receivable past due greater than 90 days with regulatory mechanisms to mitigate collection risk + References No definition available. + Details
Name: | wec_Percentofaccountsreceivablepastduegreaterthan90dayswithregulatorymechanismstocollect
Namespace Prefix: | wec_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percent of net accounts receivable and unbilled revenues with regulatory protections in place to mitigate the exposure to credit losses + References No definition available. + Details
Name: | wec_Percentofnetaccountsreceivablewithregulatoryprotections
Namespace Prefix: | wec_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | srt_ProductOrServiceAxis=us-gaap_PublicUtilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=wec_WisconsinMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=wec_IllinoisMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=wec_OtherStatesMember
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: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=us-gaap_CorporateAndOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |