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CREDIT LOSSES - GROSS RECEIVABLES AND RELATED ALLOWANCES (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Accounts receivable and unbilled revenues | $ 1,994.4 | $ 2,017.7 |  |
Allowance for credit losses | 213.8 | 199.3 | $ 200.6 | $ 198.3
Accounts receivable and unbilled revenues, net | 1,780.6 | 1,818.4 |  |
Total accounts receivable, net - past due greater than 90 days | $ 131.2 | $ 106.7 |  |
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms | 97.40% | 96.80% |  |
Amount of net accounts receivable with regulatory protections | $ 1,119.8 |  |  |
Percent of net accounts receivable with regulatory protections | 62.90% |  |  |
Utility Operations |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Accounts receivable and unbilled revenues | $ 1,936.7 | $ 1,988.0 |  |
Allowance for credit losses | 213.8 | 199.3 |  |
Accounts receivable and unbilled revenues, net | 1,722.9 | 1,788.7 |  |
Total accounts receivable, net - past due greater than 90 days | $ 131.2 | $ 106.7 |  |
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms | 97.40% | 96.80% |  |
Wisconsin | Utility Operations |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Accounts receivable and unbilled revenues | $ 1,232.2 | $ 1,199.4 |  |
Allowance for credit losses | 90.9 | 82.0 | 85.7 | 84.0
Accounts receivable and unbilled revenues, net | 1,141.3 | 1,117.4 |  |
Total accounts receivable, net - past due greater than 90 days | $ 67.9 | $ 51.9 |  |
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms | 97.50% | 97.00% |  |
Illinois | Utility Operations |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Accounts receivable and unbilled revenues | $ 561.0 | $ 624.2 |  |
Allowance for credit losses | 116.5 | 111.0 | 107.0 | 105.5
Accounts receivable and unbilled revenues, net | 444.5 | 513.2 |  |
Total accounts receivable, net - past due greater than 90 days | $ 61.6 | $ 52.9 |  |
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 | $ 143.5 | $ 164.4 |  |
Allowance for credit losses | 6.4 | 6.3 | $ 7.9 | $ 8.8
Accounts receivable and unbilled revenues, net | 137.1 | 158.1 |  |
Total accounts receivable, net - past due greater than 90 days | $ 1.7 | $ 1.9 |  |
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 | $ 50.0 | $ 25.4 |  |
Allowance for credit losses | 0.0 | 0.0 |  |
Accounts receivable and unbilled revenues, net | 50.0 | 25.4 |  |
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 | $ 7.7 | $ 4.3 |  |
Allowance for credit losses | 0.0 | 0.0 |  |
Accounts receivable and unbilled revenues, net | 7.7 | 4.3 |  |
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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