Schedule I - Short-Term Notes Receivable from Related Parties (Details) - WEC Energy Group - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Notes to parent company financial statements
Short-term notes receivable from related parties	$ 16.0	$ 30.9
UMERC
Notes to parent company financial statements
Short-term notes receivable from related parties	15.2	27.1
Wispark
Notes to parent company financial statements
Short-term notes receivable from related parties	0.8	1.1
Bluewater
Notes to parent company financial statements
Short-term notes receivable from related parties	$ 0.0	$ 2.7

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-X (SX)
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-Subsection 04
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-X (SX)
-Number 210
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-Publisher SEC

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-X (SX)
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-X (SX)
-Number 210
-Section 9
-Subsection 06
-Publisher SEC

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
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Reference 6: http://www.xbrl.org/2003/role/recommendedDisclosureRef
-Topic 810
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-Name Accounting Standards Codification
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