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CREDIT LOSSES - GROSS RECEIVABLES AND RELATED ALLOWANCES (Details) - USD ($) $ in Millions | Jun. 30, 2026 | Mar. 31, 2026 | Dec. 31, 2025 | Jun. 30, 2025 | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Accounts receivable and unbilled revenues | $ 1,678.1 |  | $ 2,211.4 |  |  |
Allowance for credit losses | 148.9 | $ 156.0 | 148.7 | $ 142.2 | $ 159.4 | $ 162.8
Accounts receivable and unbilled revenues, net | 1,529.2 |  | 2,062.7 |  |  |
Total accounts receivable, net - past due greater than 90 days | $ 134.0 |  | $ 89.8 |  |  |
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms | 93.90% |  | 89.90% |  |  |
Amount of net accounts receivable with regulatory protections | $ 882.1 |  |  |  |  |
Percent of net accounts receivable with regulatory protections | 57.70% |  |  |  |  |
Public Utilities |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Accounts receivable and unbilled revenues | $ 1,601.2 |  | $ 2,153.8 |  |  |
Allowance for credit losses | 148.9 |  | 148.7 |  |  |
Accounts receivable and unbilled revenues, net | 1,452.3 |  | 2,005.1 |  |  |
Total accounts receivable, net - past due greater than 90 days | $ 134.0 |  | $ 89.8 |  |  |
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms | 93.90% |  | 89.90% |  |  |
Wisconsin | Public Utilities |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Accounts receivable and unbilled revenues | $ 1,136.8 |  | $ 1,368.8 |  |  |
Allowance for credit losses | 61.2 | 63.6 | 61.7 | 52.3 | 60.9 | 73.6
Accounts receivable and unbilled revenues, net | 1,075.6 |  | 1,307.1 |  |  |
Total accounts receivable, net - past due greater than 90 days | $ 64.5 |  | $ 46.4 |  |  |
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms | 94.40% |  | 94.60% |  |  |
Illinois | Public Utilities |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Accounts receivable and unbilled revenues | $ 401.5 |  | $ 654.8 |  |  |
Allowance for credit losses | 83.7 | 88.3 | 82.3 | 84.6 | 93.2 | 83.9
Accounts receivable and unbilled revenues, net | 317.8 |  | 572.5 |  |  |
Total accounts receivable, net - past due greater than 90 days | $ 65.0 |  | $ 36.8 |  |  |
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 | $ 62.9 |  | $ 130.2 |  |  |
Allowance for credit losses | 4.0 | $ 4.1 | 4.7 | $ 5.3 | $ 5.3 | $ 5.3
Accounts receivable and unbilled revenues, net | 58.9 |  | 125.5 |  |  |
Total accounts receivable, net - past due greater than 90 days | $ 4.5 |  | $ 6.6 |  |  |
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 | $ 71.3 |  | $ 50.3 |  |  |
Allowance for credit losses | 0.0 |  | 0.0 |  |  |
Accounts receivable and unbilled revenues, net | 71.3 |  | 50.3 |  |  |
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% |  |  |
Corporate and Other |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Accounts receivable and unbilled revenues | $ 5.6 |  | $ 7.3 |  |  |
Allowance for credit losses | 0.0 |  | 0.0 |  |  |
Accounts receivable and unbilled revenues, net | 5.6 |  | 7.3 |  |  |
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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