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VARIABLE INTEREST ENTITIES - WEPCO ENVIRONMENTAL TRUST (Details) - USD ($) $ in Millions	1 Months Ended
	Nov. 30, 2020	Sep. 30, 2022	Dec. 31, 2021
Assets
Other current assets (restricted cash)		$ 35.7	$ 19.6
Regulatory assets		3,164.2	3,264.8
Other long-term assets (restricted cash)		51.8	51.6
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)		6.0	2.4
Regulatory assets		94.0	100.7
Other long-term assets (restricted cash)		0.6	0.6
Liabilities
Current portion of long-term debt		8.8	8.8
Other current liabilities (accrued interest)		0.5	0.1
Long-term debt		$ 98.5	$ 102.7

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