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CREDIT LOSSES - GROSS RECEIVABLES AND RELATED ALLOWANCES (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable and unbilled revenues | $ 1,341.7 |
Allowance for credit losses | 164.8 | $ 140.0
Accounts receivable and unbilled revenues, net | 1,176.9 |
Total accounts receivable, net - past due greater than 90 days | $ 97.5 |
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms | 93.40% |
Amount of net accounts receivable with regulatory protections | $ 684.6 |
Percent of net accounts receivable with regulatory protections | 58.20% |
Wisconsin |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable and unbilled revenues | $ 849.1 |
Allowance for credit losses | 67.7 | 59.9
Accounts receivable and unbilled revenues, net | 781.4 |
Total accounts receivable, net - past due greater than 90 days | $ 57.7 |
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms | 95.70% |
Illinois |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable and unbilled revenues | $ 404.7 |
Allowance for credit losses | 93.1 | 75.9
Accounts receivable and unbilled revenues, net | 311.6 |
Total accounts receivable, net - past due greater than 90 days | $ 35.9 |
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms | 100.00% |
Other States |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable and unbilled revenues | $ 79.2 |
Allowance for credit losses | 3.9 | 4.1
Accounts receivable and unbilled revenues, net | 75.3 |
Total accounts receivable, net - past due greater than 90 days | $ 3.9 |
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms | 0.00% |
Total Utility Operations |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable and unbilled revenues | $ 1,333.0 |
Allowance for credit losses | 164.7 | 139.9
Accounts receivable and unbilled revenues, net | 1,168.3 |
Total accounts receivable, net - past due greater than 90 days | $ 97.5 |
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms | 93.40% |
Non-Utility Energy Infrastructure |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable and unbilled revenues | $ 5.8 |
Allowance for credit losses | 0.0 |
Accounts receivable and unbilled revenues, net | 5.8 |
Total accounts receivable, net - past due greater than 90 days | $ 0.0 |
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms | 0.00% |
Corporate and Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable and unbilled revenues | $ 2.9 |
Allowance for credit losses | 0.1 | $ 0.1
Accounts receivable and unbilled revenues, net | 2.8 |
Total accounts receivable, net - past due greater than 90 days | $ 0.0 |
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms | 0.00% |
COVID-19 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Increase in allowance for credit loss | $ 2.7 |

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