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CREDIT LOSSES - GROSS RECEIVABLES AND RELATED ALLOWANCES (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Accounts receivable and unbilled revenues | $ 1,303.5 |  | $ 1,422.9 |  |  |
Allowance for credit losses | 199.7 | $ 231.7 | 220.1 | $ 173.3 | $ 164.7 | $ 140.0
Accounts receivable and unbilled revenues, net | 1,103.8 |  | 1,202.8 |  |  |
Total accounts receivable, net - past due greater than 90 days | $ 87.2 |  | $ 122.8 |  |  |
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms | 87.70% |  | 95.50% |  |  |
Amount of net accounts receivable with regulatory protections | $ 527.5 |  |  |  |  |
Percent of net accounts receivable with regulatory protections | 47.80% |  |  |  |  |
Utility Operations |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Accounts receivable and unbilled revenues | $ 1,289.7 |  | $ 1,373.5 |  |  |
Allowance for credit losses | 199.7 | 231.7 | 220.1 | 173.1 | 164.6 | 139.9
Accounts receivable and unbilled revenues, net | 1,090.0 |  | 1,153.4 |  |  |
Total accounts receivable, net - past due greater than 90 days | $ 87.2 |  | $ 122.8 |  |  |
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms | 87.70% |  | 95.50% |  |  |
Wisconsin | Utility Operations |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Accounts receivable and unbilled revenues | $ 927.9 |  | $ 899.8 |  |  |
Allowance for credit losses | 76.4 | 114.4 | 102.1 | 88.5 | 77.9 | 59.9
Accounts receivable and unbilled revenues, net | 851.5 |  | 797.7 |  |  |
Total accounts receivable, net - past due greater than 90 days | $ 51.9 |  | $ 84.8 |  |  |
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms | 96.50% |  | 97.60% |  |  |
Illinois | Utility Operations |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Accounts receivable and unbilled revenues | $ 316.6 |  | $ 393.9 |  |  |
Allowance for credit losses | 114.7 | 109.0 | 111.6 | 80.2 | 82.7 | 75.9
Accounts receivable and unbilled revenues, net | 201.9 |  | 282.3 |  |  |
Total accounts receivable, net - past due greater than 90 days | $ 26.4 |  | $ 34.5 |  |  |
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 | $ 45.2 |  | $ 79.8 |  |  |
Allowance for credit losses | 8.6 | 8.3 | 6.4 | 4.4 | 4.0 | 4.1
Accounts receivable and unbilled revenues, net | 36.6 |  | 73.4 |  |  |
Total accounts receivable, net - past due greater than 90 days | $ 8.9 |  | $ 3.5 |  |  |
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 | $ 9.4 |  | $ 45.0 |  |  |
Allowance for credit losses | 0.0 |  | 0.0 |  |  |
Accounts receivable and unbilled revenues, net | 9.4 |  | 45.0 |  |  |
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 | $ 4.4 |  | $ 4.4 |  |  |
Allowance for credit losses | 0.0 | $ 0.0 | 0.0 | $ 0.2 | $ 0.1 | $ 0.1
Accounts receivable and unbilled revenues, net | 4.4 |  | 4.4 |  |  |
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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