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Credit Losses - Gross Receivables and Related Allowances (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Accounts receivable and unbilled revenues | $ 1,704.0 | $ 1,422.9 |
Allowance for credit losses | 198.3 | 220.1 | $ 140.0
Accounts receivable and unbilled revenues, net | 1,505.7 | 1,202.8 |
Total accounts receivable, net - past due greater than 90 days | $ 86.5 | $ 122.8 |
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms | 94.80% | 95.50% |
Amount of net accounts receivable with regulatory protections | $ 839.1 |  |
Percent of net accounts receivable with regulatory protections | 55.70% |  |
Public Utilities |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Accounts receivable and unbilled revenues | $ 1,681.9 | $ 1,373.5 |
Allowance for credit losses | 198.3 | 220.1 | 139.9
Accounts receivable and unbilled revenues, net | 1,483.6 | 1,153.4 |
Total accounts receivable, net - past due greater than 90 days | $ 86.5 | $ 122.8 |
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms | 94.80% | 95.50% |
Wisconsin | Public Utilities |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Accounts receivable and unbilled revenues | $ 1,053.1 | $ 899.8 |
Allowance for credit losses | 84.0 | 102.1 | 59.9
Accounts receivable and unbilled revenues, net | 969.1 | 797.7 |
Total accounts receivable, net - past due greater than 90 days | $ 46.5 | $ 84.8 |
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms | 97.60% | 97.60% |
Illinois | Public Utilities |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Accounts receivable and unbilled revenues | $ 523.1 | $ 393.9 |
Allowance for credit losses | 105.5 | 111.6 | 75.9
Accounts receivable and unbilled revenues, net | 417.6 | 282.3 |
Total accounts receivable, net - past due greater than 90 days | $ 36.6 | $ 34.5 |
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 | $ 105.7 | $ 79.8 |
Allowance for credit losses | 8.8 | 6.4 | 4.1
Accounts receivable and unbilled revenues, net | 96.9 | 73.4 |
Total accounts receivable, net - past due greater than 90 days | $ 3.4 | $ 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 | $ 17.0 | $ 45.0 |
Allowance for credit losses | 0.0 | 0.0 |
Accounts receivable and unbilled revenues, net | 17.0 | 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 | $ 5.1 | $ 4.4 |
Allowance for credit losses | 0.0 | 0.0 | $ 0.1
Accounts receivable and unbilled revenues, net | 5.1 | 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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