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Regulatory Environment - COVID-19 (Details) $ in Millions | 1 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2021 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 order | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Public Utilities, General Disclosures |  |  |  |  |
Regulatory asset |  |  |  | $ 3,306.9 | $ 3,367.1
Public Service Commission of Wisconsin |  |  |  |  |
Public Utilities, General Disclosures |  |  |  |  |
Number of orders issued in response to COVID-19 | order |  |  | 2 |  |
Illinois Commerce Commission (ICC) |  |  |  |  |
Public Utilities, General Disclosures |  |  |  |  |
Additional period of time deposit requirements will be waived |  | 4 months |  |  |
Percentage below federal poverty level for which customer disconnection is disallowed | 300.00% |  |  |  |
Illinois Commerce Commission (ICC) | COVID-19 |  |  |  |  |
Public Utilities, General Disclosures |  |  |  |  |
Recovery period of regulatory asset |  | 36 months |  |  |
Regulatory asset |  |  |  | $ 9.5 |
Illinois Commerce Commission (ICC) | PGL |  |  |  |  |
Public Utilities, General Disclosures |  |  |  |  |
Required funding to bill payment assistance program | $ 6.0 | $ 12.0 |  |  |
Illinois Commerce Commission (ICC) | NSG |  |  |  |  |
Public Utilities, General Disclosures |  |  |  |  |
Required funding to bill payment assistance program | $ 0.0 | $ 1.2 |  |  |

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- Definition Amortization period for the recovery of regulatory asset, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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