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CREDIT LOSSES - GROSS RECEIVABLES AND RELATED ALLOWANCES (Details) - USD ($) $ in Millions	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable and unbilled revenues	$ 1,623.5		$ 1,704.0
Allowance for credit losses	175.8	$ 200.6	198.3	$ 231.7	$ 259.1	$ 220.1
Accounts receivable and unbilled revenues, net	1,447.7		1,505.7
Total accounts receivable, net - past due greater than 90 days	$ 145.8		$ 86.5
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms	93.60%		94.80%
Amount of net accounts receivable with regulatory protections	$ 782.2
Percent of net accounts receivable with regulatory protections	54.00%
Utility Operations
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable and unbilled revenues	$ 1,594.2		$ 1,681.9
Allowance for credit losses	175.8		198.3
Accounts receivable and unbilled revenues, net	1,418.4		1,483.6
Total accounts receivable, net - past due greater than 90 days	$ 145.8		$ 86.5
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms	93.60%		94.80%
Wisconsin | Utility Operations
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable and unbilled revenues	$ 1,029.1		$ 1,053.1
Allowance for credit losses	78.0	85.7	84.0	114.4	129.5	102.1
Accounts receivable and unbilled revenues, net	951.1		969.1
Total accounts receivable, net - past due greater than 90 days	$ 71.6		$ 46.5
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms	97.20%		97.60%
Illinois | Utility Operations
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable and unbilled revenues	$ 485.2		$ 523.1
Allowance for credit losses	91.0	107.0	105.5	109.0	122.0	111.6
Accounts receivable and unbilled revenues, net	394.2		417.6
Total accounts receivable, net - past due greater than 90 days	$ 66.8		$ 36.6
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms	100.00%		100.00%
Other States | Utility Operations
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable and unbilled revenues	$ 79.9		$ 105.7
Allowance for credit losses	6.8	$ 7.9	8.8	$ 8.3	$ 7.6	$ 6.4
Accounts receivable and unbilled revenues, net	73.1		96.9
Total accounts receivable, net - past due greater than 90 days	$ 7.4		$ 3.4
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms	0.00%		0.00%
Non-Utility Energy Infrastructure
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable and unbilled revenues	$ 23.7		$ 17.0
Allowance for credit losses	0.0		0.0
Accounts receivable and unbilled revenues, net	23.7		17.0
Total accounts receivable, net - past due greater than 90 days	$ 0.0		$ 0.0
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms	0.00%		0.00%
Corporate and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable and unbilled revenues	$ 5.6		$ 5.1
Allowance for credit losses	0.0		0.0
Accounts receivable and unbilled revenues, net	5.6		5.1
Total accounts receivable, net - past due greater than 90 days	$ 0.0		$ 0.0
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms	0.00%		0.00%

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