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CREDIT LOSSES - GROSS RECEIVABLES AND RELATED ALLOWANCES (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Accounts receivable and unbilled revenues | $ 1,409.6 |  | $ 1,696.7 |  |  |
Allowance for credit losses | 166.9 | $ 190.7 | 193.5 | $ 178.7 | $ 213.8 | $ 199.3
Accounts receivable and unbilled revenues, net | 1,242.7 |  | 1,503.2 |  |  |
Total accounts receivable, net - past due greater than 90 days | $ 125.5 |  | $ 98.8 |  |  |
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms | 95.10% |  | 94.50% |  |  |
Amount of net accounts receivable with regulatory protections | $ 729.6 |  |  |  |  |
Percent of net accounts receivable with regulatory protections | 58.70% |  |  |  |  |
Public Utilities |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Accounts receivable and unbilled revenues | $ 1,366.8 |  | $ 1,654.4 |  |  |
Allowance for credit losses | 166.9 |  | 193.5 |  |  |
Accounts receivable and unbilled revenues, net | 1,199.9 |  | 1,460.9 |  |  |
Total accounts receivable, net - past due greater than 90 days | $ 125.5 |  | $ 98.8 |  |  |
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms | 95.10% |  | 94.50% |  |  |
Wisconsin | Public Utilities |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Accounts receivable and unbilled revenues | $ 966.0 |  | $ 1,078.0 |  |  |
Allowance for credit losses | 68.7 | 83.0 | 77.4 | 76.4 | 90.9 | 82.0
Accounts receivable and unbilled revenues, net | 897.3 |  | 1,000.6 |  |  |
Total accounts receivable, net - past due greater than 90 days | $ 66.9 |  | $ 51.7 |  |  |
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms | 94.40% |  | 93.60% |  |  |
Illinois | Public Utilities |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Accounts receivable and unbilled revenues | $ 364.0 |  | $ 481.5 |  |  |
Allowance for credit losses | 93.2 | 104.6 | 109.7 | 97.0 | 116.5 | 111.0
Accounts receivable and unbilled revenues, net | 270.8 |  | 371.8 |  |  |
Total accounts receivable, net - past due greater than 90 days | $ 56.2 |  | $ 45.0 |  |  |
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms | 100.00% |  | 100.00% |  |  |
Other States | Public Utilities |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Accounts receivable and unbilled revenues | $ 36.8 |  | $ 94.9 |  |  |
Allowance for credit losses | 5.0 | $ 3.1 | 6.4 | $ 5.3 | $ 6.4 | $ 6.3
Accounts receivable and unbilled revenues, net | 31.8 |  | 88.5 |  |  |
Total accounts receivable, net - past due greater than 90 days | $ 2.4 |  | $ 2.1 |  |  |
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 | $ 37.1 |  | $ 33.9 |  |  |
Allowance for credit losses | 0.0 |  | 0.0 |  |  |
Accounts receivable and unbilled revenues, net | 37.1 |  | 33.9 |  |  |
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 | $ 5.7 |  | $ 8.4 |  |  |
Allowance for credit losses | 0.0 |  | 0.0 |  |  |
Accounts receivable and unbilled revenues, net | 5.7 |  | 8.4 |  |  |
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% |  |  |

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