Schedule I - Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Notes to parent company financial statements
Cash received for income taxes, net	$ (264.2)	$ (58.9)	$ 52.4
WEC Energy Group
Notes to parent company financial statements
Cash paid for interest	324.2	209.1	88.1
Cash received for income taxes, net	(66.7)	(104.5)	(72.9)
WEC Energy Group \| WECI
Notes to parent company financial statements
Issuance of long-term note receivable to WECI	300.0	430.0	0.0
Repayment of long-term note receivable to WECI	$ 430.0	$ 0.0	$ 0.0

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.

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