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CREDIT LOSSES - GROSS RECEIVABLES AND RELATED ALLOWANCES (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Accounts receivable and unbilled revenues | $ 1,420.0 |  | $ 2,017.7 |  |  |
Allowance for credit losses | 176.8 | $ 178.7 | 199.3 | $ 168.5 | $ 175.8 | $ 198.3
Accounts receivable and unbilled revenues, net | 1,243.2 |  | 1,818.4 |  |  |
Total accounts receivable, net - past due greater than 90 days | $ 127.9 |  | $ 106.7 |  |  |
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms | 94.20% |  | 96.80% |  |  |
Amount of net accounts receivable with regulatory protections | $ 634.7 |  |  |  |  |
Percent of net accounts receivable with regulatory protections | 51.10% |  |  |  |  |
Utility Operations |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Accounts receivable and unbilled revenues | $ 1,373.1 |  | $ 1,988.0 |  |  |
Allowance for credit losses | 176.8 |  | 199.3 |  |  |
Accounts receivable and unbilled revenues, net | 1,196.3 |  | 1,788.7 |  |  |
Total accounts receivable, net - past due greater than 90 days | $ 127.9 |  | $ 106.7 |  |  |
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms | 94.20% |  | 96.80% |  |  |
Wisconsin | Utility Operations |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Accounts receivable and unbilled revenues | $ 956.7 |  | $ 1,199.4 |  |  |
Allowance for credit losses | 72.0 | 76.4 | 82.0 | 72.4 | 78.0 | 84.0
Accounts receivable and unbilled revenues, net | 884.7 |  | 1,117.4 |  |  |
Total accounts receivable, net - past due greater than 90 days | $ 54.0 |  | $ 51.9 |  |  |
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms | 94.00% |  | 97.00% |  |  |
Illinois | Utility Operations |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Accounts receivable and unbilled revenues | $ 355.8 |  | $ 624.2 |  |  |
Allowance for credit losses | 100.0 | 97.0 | 111.0 | 89.7 | 91.0 | 105.5
Accounts receivable and unbilled revenues, net | 255.8 |  | 513.2 |  |  |
Total accounts receivable, net - past due greater than 90 days | $ 69.7 |  | $ 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 | $ 60.6 |  | $ 164.4 |  |  |
Allowance for credit losses | 4.8 | $ 5.3 | 6.3 | $ 6.4 | $ 6.8 | $ 8.8
Accounts receivable and unbilled revenues, net | 55.8 |  | 158.1 |  |  |
Total accounts receivable, net - past due greater than 90 days | $ 4.2 |  | $ 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 | $ 40.2 |  | $ 25.4 |  |  |
Allowance for credit losses | 0.0 |  | 0.0 |  |  |
Accounts receivable and unbilled revenues, net | 40.2 |  | 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 | $ 6.7 |  | $ 4.3 |  |  |
Allowance for credit losses | 0.0 |  | 0.0 |  |  |
Accounts receivable and unbilled revenues, net | 6.7 |  | 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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