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CREDIT LOSSES - GROSS RECEIVABLES AND RELATED ALLOWANCES (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Accounts receivable and unbilled revenues | $ 1,629.0 | $ 1,422.9 |  |
Allowance for credit losses | 259.1 | 220.1 | $ 164.8 | $ 140.0
Accounts receivable and unbilled revenues, net | 1,369.9 | 1,202.8 |  |
Total accounts receivable, net - past due greater than 90 days | $ 111.0 | $ 122.8 |  |
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms | 95.00% | 95.50% |  |
Amount of net accounts receivable with regulatory protections | $ 742.0 |  |  |
Percent of net accounts receivable with regulatory protections | 54.20% |  |  |
Utility Operations |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Accounts receivable and unbilled revenues | $ 1,600.2 | $ 1,373.5 |  |
Allowance for credit losses | 259.1 | 220.1 | 164.7 | 139.9
Accounts receivable and unbilled revenues, net | 1,341.1 | 1,153.4 |  |
Total accounts receivable, net - past due greater than 90 days | $ 111.0 | $ 122.8 |  |
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms | 95.00% | 95.50% |  |
Wisconsin | Utility Operations |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Accounts receivable and unbilled revenues | $ 1,056.9 | $ 899.8 |  |
Allowance for credit losses | 129.5 | 102.1 | 67.7 | 59.9
Accounts receivable and unbilled revenues, net | 927.4 | 797.7 |  |
Total accounts receivable, net - past due greater than 90 days | $ 68.8 | $ 84.8 |  |
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms | 97.50% | 97.60% |  |
Illinois | Utility Operations |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Accounts receivable and unbilled revenues | $ 465.8 | $ 393.9 |  |
Allowance for credit losses | 122.0 | 111.6 | 93.1 | 75.9
Accounts receivable and unbilled revenues, net | 343.8 | 282.3 |  |
Total accounts receivable, net - past due greater than 90 days | $ 38.4 | $ 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 | $ 77.5 | $ 79.8 |  |
Allowance for credit losses | 7.6 | 6.4 | 3.9 | 4.1
Accounts receivable and unbilled revenues, net | 69.9 | 73.4 |  |
Total accounts receivable, net - past due greater than 90 days | $ 3.8 | $ 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 | $ 24.9 | $ 45.0 |  |
Allowance for credit losses | 0.0 | 0.0 |  |
Accounts receivable and unbilled revenues, net | 24.9 | 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 | $ 3.9 | $ 4.4 |  |
Allowance for credit losses | 0.0 | 0.0 | $ 0.1 | $ 0.1
Accounts receivable and unbilled revenues, net | 3.9 | 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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