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VARIABLE INTEREST ENTITIES - WEPCO ENVIRONMENTAL TRUST (Details) - USD ($) $ in Millions	1 Months Ended
	Nov. 30, 2020	Mar. 31, 2023	Dec. 31, 2022
Assets
Other current assets (restricted cash)		$ 39.2	$ 25.6
Regulatory assets		3,313.1	3,264.6
Other long-term assets (restricted cash)		53.1	127.7
Liabilities
Accounts payable		680.0	1,198.1
WEPCo Environmental Trust
Variable interest entities
Securitization of environmental control costs related to Pleasant Prairie power plant	$ 100.0
Assets
Other current assets (restricted cash)		5.1	3.0
Regulatory assets		90.9	92.4
Other long-term assets (restricted cash)		0.6	0.6
Liabilities
Current portion of long-term debt		8.9	8.9
Accounts payable		0.1	0.0
Other current liabilities (accrued interest)		0.5	0.1
Long-term debt		$ 94.1	$ 94.1

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