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CREDIT LOSSES - GROSS RECEIVABLES AND RELATED ALLOWANCES (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Accounts receivable and unbilled revenues | $ 1,836.3 | $ 1,704.0 |  |
Allowance for credit losses | 200.6 | 198.3 | $ 259.1 | $ 220.1
Accounts receivable and unbilled revenues, net | 1,635.7 | 1,505.7 |  |
Total accounts receivable, net - past due greater than 90 days | $ 102.9 | $ 86.5 |  |
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms | 95.40% | 94.80% |  |
Amount of net accounts receivable with regulatory protections | $ 1,008.4 |  |  |
Percent of net accounts receivable with regulatory protections | 61.60% |  |  |
Utility Operations |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Accounts receivable and unbilled revenues | $ 1,810.7 | $ 1,681.9 |  |
Allowance for credit losses | 200.6 | 198.3 |  |
Accounts receivable and unbilled revenues, net | 1,610.1 | 1,483.6 |  |
Total accounts receivable, net - past due greater than 90 days | $ 102.9 | $ 86.5 |  |
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms | 95.40% | 94.80% |  |
Wisconsin | Utility Operations |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Accounts receivable and unbilled revenues | $ 1,072.2 | $ 1,053.1 |  |
Allowance for credit losses | 85.7 | 84.0 | 129.5 | 102.1
Accounts receivable and unbilled revenues, net | 986.5 | 969.1 |  |
Total accounts receivable, net - past due greater than 90 days | $ 55.5 | $ 46.5 |  |
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms | 98.20% | 97.60% |  |
Illinois | Utility Operations |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Accounts receivable and unbilled revenues | $ 612.8 | $ 523.1 |  |
Allowance for credit losses | 107.0 | 105.5 | 122.0 | 111.6
Accounts receivable and unbilled revenues, net | 505.8 | 417.6 |  |
Total accounts receivable, net - past due greater than 90 days | $ 43.7 | $ 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 | $ 125.7 | $ 105.7 |  |
Allowance for credit losses | 7.9 | 8.8 | $ 7.6 | $ 6.4
Accounts receivable and unbilled revenues, net | 117.8 | 96.9 |  |
Total accounts receivable, net - past due greater than 90 days | $ 3.7 | $ 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 | $ 17.1 | $ 17.0 |  |
Allowance for credit losses | 0.0 | 0.0 |  |
Accounts receivable and unbilled revenues, net | 17.1 | 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 | $ 8.5 | $ 5.1 |  |
Allowance for credit losses | 0.0 | 0.0 |  |
Accounts receivable and unbilled revenues, net | 8.5 | 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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