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Credit Losses - Gross Receivables and Related Allowances (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Accounts receivable and unbilled revenues | $ 1,832.1 | $ 1,696.7 |  |
Allowance for credit losses | 162.8 | 193.5 | $ 199.3 | $ 198.3
Accounts receivable and unbilled revenues, net | 1,669.3 | 1,503.2 |  |
Total accounts receivable, net - past due greater than 90 days | $ 84.4 | $ 98.8 |  |
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms | 93.20% | 94.50% |  |
Amount of net accounts receivable with regulatory protections | $ 1,029.0 |  |  |
Percent of net accounts receivable with regulatory protections | 61.60% |  |  |
Public utilities |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Accounts receivable and unbilled revenues | $ 1,786.1 | $ 1,654.4 |  |
Allowance for credit losses | 162.8 | 193.5 |  |
Accounts receivable and unbilled revenues, net | 1,623.3 | 1,460.9 |  |
Total accounts receivable, net - past due greater than 90 days | $ 84.4 | $ 98.8 |  |
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms | 93.20% | 94.50% |  |
Wisconsin | Public utilities |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Accounts receivable and unbilled revenues | $ 1,149.9 | $ 1,078.0 |  |
Allowance for credit losses | 73.6 | 77.4 | 82.0 | 84.0
Accounts receivable and unbilled revenues, net | 1,076.3 | 1,000.6 |  |
Total accounts receivable, net - past due greater than 90 days | $ 51.8 | $ 51.7 |  |
Past due greater than 90 days - collection risk mitigated by regulatory mechanisms | 93.80% | 93.60% |  |
Illinois | Public utilities |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Accounts receivable and unbilled revenues | $ 535.6 | $ 481.5 |  |
Allowance for credit losses | 83.9 | 109.7 | 111.0 | 105.5
Accounts receivable and unbilled revenues, net | 451.7 | 371.8 |  |
Total accounts receivable, net - past due greater than 90 days | $ 30.1 | $ 45.0 |  |
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 | $ 100.6 | $ 94.9 |  |
Allowance for credit losses | 5.3 | 6.4 | $ 6.3 | $ 8.8
Accounts receivable and unbilled revenues, net | 95.3 | 88.5 |  |
Total accounts receivable, net - past due greater than 90 days | $ 2.5 | $ 2.1 |  |
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 | $ 40.0 | $ 33.9 |  |
Allowance for credit losses | 0.0 | 0.0 |  |
Accounts receivable and unbilled revenues, net | 40.0 | 33.9 |  |
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 | $ 6.0 | $ 8.4 |  |
Allowance for credit losses | 0.0 | 0.0 |  |
Accounts receivable and unbilled revenues, net | 6.0 | 8.4 |  |
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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