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CREDIT LOSSES - GROSS RECEIVABLES AND RELATED ALLOWANCES (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Accounts receivable and unbilled revenues | $ 1,971.8 | $ 1,832.1 |  |
Allowance for credit losses | 159.4 | 162.8 | $ 190.7 | $ 193.5
Accounts receivable and unbilled revenues, net | 1,812.4 | 1,669.3 |  |
Total accounts receivable, net - past due greater than 90 days | $ 78.9 | $ 84.4 |  |
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms | 96.70% | 93.20% |  |
Amount of net accounts receivable with regulatory protections | $ 1,134.0 |  |  |
Percent of net accounts receivable with regulatory protections | 62.60% |  |  |
Public Utilities |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Accounts receivable and unbilled revenues | $ 1,900.9 | $ 1,786.1 |  |
Allowance for credit losses | 159.4 | 162.8 |  |
Accounts receivable and unbilled revenues, net | 1,741.5 | 1,623.3 |  |
Total accounts receivable, net - past due greater than 90 days | $ 78.9 | $ 84.4 |  |
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms | 96.70% | 93.20% |  |
Wisconsin | Public Utilities |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Accounts receivable and unbilled revenues | $ 1,183.3 | $ 1,149.9 |  |
Allowance for credit losses | 60.9 | 73.6 | 83.0 | 77.4
Accounts receivable and unbilled revenues, net | 1,122.4 | 1,076.3 |  |
Total accounts receivable, net - past due greater than 90 days | $ 43.3 | $ 51.8 |  |
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms | 96.00% | 93.80% |  |
Illinois | Public Utilities |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Accounts receivable and unbilled revenues | $ 605.9 | $ 535.6 |  |
Allowance for credit losses | 93.2 | 83.9 | 104.6 | 109.7
Accounts receivable and unbilled revenues, net | 512.7 | 451.7 |  |
Total accounts receivable, net - past due greater than 90 days | $ 34.7 | $ 30.1 |  |
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 | $ 111.7 | $ 100.6 |  |
Allowance for credit losses | 5.3 | 5.3 | $ 3.1 | $ 6.4
Accounts receivable and unbilled revenues, net | 106.4 | 95.3 |  |
Total accounts receivable, net - past due greater than 90 days | $ 0.9 | $ 2.5 |  |
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 | $ 64.5 | $ 40.0 |  |
Allowance for credit losses | 0.0 | 0.0 |  |
Accounts receivable and unbilled revenues, net | 64.5 | 40.0 |  |
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 | $ 6.4 | $ 6.0 |  |
Allowance for credit losses | 0.0 | 0.0 |  |
Accounts receivable and unbilled revenues, net | 6.4 | 6.0 |  |
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% |  |

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