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Short-Term Debt and Lines of Credit - Credit Facilities (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 USD ($) extension | Dec. 31, 2022 USD ($)
Line of Credit Facility [Line Items] |  |
Short-term credit capacity | $ 3,300.0 |
Available capacity under existing agreements | $ 1,280.5 |
Number of extensions available on a credit facility | extension | 2 |
Length of credit facility extension | 1 year |
WE | Credit facility maturing September 2026 |  |
Line of Credit Facility [Line Items] |  |
Short-term credit capacity | $ 500.0 |
Number of extensions available on a credit facility | extension | 2 |
Length of credit facility extension | 1 year |
WPS | Credit facility maturing September 2026 |  |
Line of Credit Facility [Line Items] |  |
Short-term credit capacity | $ 400.0 |
Number of extensions available on a credit facility | extension | 2 |
Length of credit facility extension | 1 year |
WG | Credit facility maturing September 2026 |  |
Line of Credit Facility [Line Items] |  |
Short-term credit capacity | $ 350.0 |
Number of extensions available on a credit facility | extension | 2 |
Length of credit facility extension | 1 year |
PGL | Credit facility maturing September 2026 |  |
Line of Credit Facility [Line Items] |  |
Short-term credit capacity | $ 350.0 |
Number of extensions available on a credit facility | extension | 2 |
Length of credit facility extension | 1 year |
WEC Energy Group |  |
Line of Credit Facility [Line Items] |  |
Commercial paper outstanding | $ 697.0 | $ 399.7
WEC Energy Group | Credit facility maturing September 2026 |  |
Line of Credit Facility [Line Items] |  |
Short-term credit capacity | $ 1,500.0 |
Number of extensions available on a credit facility | extension | 2 |
Length of credit facility extension | 1 year |
WEC Energy Group | Credit facility maturing October 2024 |  |
Line of Credit Facility [Line Items] |  |
Short-term credit capacity | $ 200.0 |
Letter of Credit |  |
Line of Credit Facility [Line Items] |  |
Letters of credit issued inside credit facilities | 2.3 |
Commercial paper |  |
Line of Credit Facility [Line Items] |  |
Commercial paper outstanding | $ 2,017.2 | $ 1,643.5

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- Definition Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days. + References Reference 1: 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)(16)(a)(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(a)(3)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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