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CREDIT LOSSES - GROSS RECEIVABLES AND RELATED ALLOWANCES (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Accounts receivable and unbilled revenues | $ 1,490.3 |  | $ 1,704.0 |  |  |
Allowance for credit losses | 168.5 | $ 175.8 | 198.3 | $ 199.7 | $ 231.7 | $ 220.1
Accounts receivable and unbilled revenues, net | 1,321.8 |  | 1,505.7 |  |  |
Total accounts receivable, net - past due greater than 90 days | $ 135.0 |  | $ 86.5 |  |  |
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms | 95.10% |  | 94.80% |  |  |
Amount of net accounts receivable with regulatory protections | $ 754.7 |  |  |  |  |
Percent of net accounts receivable with regulatory protections | 57.10% |  |  |  |  |
Utility Operations |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Accounts receivable and unbilled revenues | $ 1,467.0 |  | $ 1,681.9 |  |  |
Allowance for credit losses | 168.5 |  | 198.3 |  |  |
Accounts receivable and unbilled revenues, net | 1,298.5 |  | 1,483.6 |  |  |
Total accounts receivable, net - past due greater than 90 days | $ 135.0 |  | $ 86.5 |  |  |
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms | 95.10% |  | 94.80% |  |  |
Wisconsin | Utility Operations |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Accounts receivable and unbilled revenues | $ 970.2 |  | $ 1,053.1 |  |  |
Allowance for credit losses | 72.4 | 78.0 | 84.0 | 76.4 | 114.4 | 102.1
Accounts receivable and unbilled revenues, net | 897.8 |  | 969.1 |  |  |
Total accounts receivable, net - past due greater than 90 days | $ 56.0 |  | $ 46.5 |  |  |
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms | 96.00% |  | 97.60% |  |  |
Illinois | Utility Operations |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Accounts receivable and unbilled revenues | $ 429.7 |  | $ 523.1 |  |  |
Allowance for credit losses | 89.7 | 91.0 | 105.5 | 114.7 | 109.0 | 111.6
Accounts receivable and unbilled revenues, net | 340.0 |  | 417.6 |  |  |
Total accounts receivable, net - past due greater than 90 days | $ 74.6 |  | $ 36.6 |  |  |
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 | $ 67.1 |  | $ 105.7 |  |  |
Allowance for credit losses | 6.4 | $ 6.8 | 8.8 | $ 8.6 | $ 8.3 | $ 6.4
Accounts receivable and unbilled revenues, net | 60.7 |  | 96.9 |  |  |
Total accounts receivable, net - past due greater than 90 days | $ 4.4 |  | $ 3.4 |  |  |
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 | $ 18.5 |  | $ 17.0 |  |  |
Allowance for credit losses | 0.0 |  | 0.0 |  |  |
Accounts receivable and unbilled revenues, net | 18.5 |  | 17.0 |  |  |
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 | $ 4.8 |  | $ 5.1 |  |  |
Allowance for credit losses | 0.0 |  | 0.0 |  |  |
Accounts receivable and unbilled revenues, net | 4.8 |  | 5.1 |  |  |
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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