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Credit Losses - Gross Receivables and Related Allowances (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Accounts receivable and unbilled revenues | $ 2,017.7 | $ 1,704.0 |  |
Allowance for credit losses | 199.3 | 198.3 | $ 220.1 | $ 140.0
Accounts receivable and unbilled revenues, net | 1,818.4 | 1,505.7 |  |
Total accounts receivable, net - past due greater than 90 days | $ 106.7 | $ 86.5 |  |
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms | 96.80% | 94.80% |  |
Amount of net accounts receivable with regulatory protections | $ 1,079.1 |  |  |
Percent of net accounts receivable with regulatory protections | 59.30% |  |  |
Public utilities |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Accounts receivable and unbilled revenues | $ 1,988.0 | $ 1,681.9 |  |
Allowance for credit losses | 199.3 | 198.3 | 220.1 | 139.9
Accounts receivable and unbilled revenues, net | 1,788.7 | 1,483.6 |  |
Total accounts receivable, net - past due greater than 90 days | $ 106.7 | $ 86.5 |  |
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms | 96.80% | 94.80% |  |
Wisconsin | Public utilities |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Accounts receivable and unbilled revenues | $ 1,199.4 | $ 1,053.1 |  |
Allowance for credit losses | 82.0 | 84.0 | 102.1 | 59.9
Accounts receivable and unbilled revenues, net | 1,117.4 | 969.1 |  |
Total accounts receivable, net - past due greater than 90 days | $ 51.9 | $ 46.5 |  |
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms | 97.00% | 97.60% |  |
Illinois | Public utilities |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Accounts receivable and unbilled revenues | $ 624.2 | $ 523.1 |  |
Allowance for credit losses | 111.0 | 105.5 | 111.6 | 75.9
Accounts receivable and unbilled revenues, net | 513.2 | 417.6 |  |
Total accounts receivable, net - past due greater than 90 days | $ 52.9 | $ 36.6 |  |
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 | $ 164.4 | $ 105.7 |  |
Allowance for credit losses | 6.3 | 8.8 | 6.4 | 4.1
Accounts receivable and unbilled revenues, net | 158.1 | 96.9 |  |
Total accounts receivable, net - past due greater than 90 days | $ 1.9 | $ 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 | $ 25.4 | $ 17.0 |  |
Allowance for credit losses | 0.0 | 0.0 |  |
Accounts receivable and unbilled revenues, net | 25.4 | 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 | $ 4.3 | $ 5.1 |  |
Allowance for credit losses | 0.0 | 0.0 | $ 0.0 | $ 0.1
Accounts receivable and unbilled revenues, net | 4.3 | 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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