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Regulatory Environment - Recovery of Natural Gas Costs (Details) $ in Millions | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Oct. 31, 2022 USD ($) | Sep. 30, 2021 | Aug. 31, 2021 USD ($) utility | Mar. 31, 2021 USD ($) | Feb. 28, 2021 USD ($)
--- | --- | --- | --- | --- | --- | --- | ---
Public Utilities, General Disclosures |  |  |  |  |  |  |
Amounts recoverable from customers | $ 24.9 | $ 42.3 |  |  |  |  |
Total regulatory assets | 3,274.7 | 3,306.9 |  |  |  |  |
Regulatory assets | 3,249.8 | 3,264.6 |  |  |  |  |
Energy costs recoverable through rate adjustments |  |  |  |  |  |  |
Public Utilities, General Disclosures |  |  |  |  |  |  |
Total regulatory assets | 3.2 | 26.9 |  |  |  |  |
MERC extraordinary natural gas costs |  |  |  |  |  |  |
Public Utilities, General Disclosures |  |  |  |  |  |  |
Recovery period of regulatory asset |  |  |  | 27 months |  |  |
Total regulatory assets | $ 0.8 | $ 35.1 |  |  |  |  |
Public Service Commission of Wisconsin (PSCW) | WE | Energy costs recoverable through rate adjustments |  |  |  |  |  |  |
Public Utilities, General Disclosures |  |  |  |  |  |  |
Amounts recoverable from customers |  |  |  |  |  | $ 54.0 |
Recovery period of regulatory asset |  |  |  |  |  | 3 months |
Public Service Commission of Wisconsin (PSCW) | WG | Energy costs recoverable through rate adjustments |  |  |  |  |  |  |
Public Utilities, General Disclosures |  |  |  |  |  |  |
Amounts recoverable from customers |  |  |  |  |  | $ 24.0 |
Recovery period of regulatory asset |  |  |  |  |  | 3 months |
Public Service Commission of Wisconsin (PSCW) | WPS | Energy costs recoverable through rate adjustments |  |  |  |  |  |  |
Public Utilities, General Disclosures |  |  |  |  |  |  |
Amounts recoverable from customers |  |  |  |  |  | $ 28.0 |
Recovery period of regulatory asset |  |  |  |  |  | 3 months |
Illinois Commerce Commission (ICC) | PGL | Energy costs recoverable through rate adjustments |  |  |  |  |  |  |
Public Utilities, General Disclosures |  |  |  |  |  |  |
Amounts recoverable from customers |  |  |  |  |  |  | $ 131.0
Recovery period of regulatory asset |  |  |  |  |  |  | 12 months
Illinois Commerce Commission (ICC) | NSG | Energy costs recoverable through rate adjustments |  |  |  |  |  |  |
Public Utilities, General Disclosures |  |  |  |  |  |  |
Amounts recoverable from customers |  |  |  |  |  |  | $ 10.0
Recovery period of regulatory asset |  |  |  |  |  |  | 12 months
Minnesota Public Utilities Commission (MPUC) | MERC |  |  |  |  |  |  |
Public Utilities, General Disclosures |  |  |  |  |  |  |
Number of utilities filing a joint proposal | utility |  |  |  |  | 4 |  |
Minnesota Public Utilities Commission (MPUC) | MERC | Energy costs recoverable through rate adjustments |  |  |  |  |  |  |
Public Utilities, General Disclosures |  |  |  |  |  |  |
Amounts recoverable from customers |  |  |  |  | $ 10.0 |  |
Recovery period of regulatory asset |  |  |  |  | 12 months |  |
Total regulatory assets |  |  |  |  |  |  | $ 75.0
Minnesota Public Utilities Commission (MPUC) | MERC | MERC extraordinary natural gas costs |  |  |  |  |  |  |
Public Utilities, General Disclosures |  |  |  |  |  |  |
Recovery period of regulatory asset |  |  |  |  | 27 months |  |
Regulatory assets |  |  | $ 62.0 |  | $ 65.0 |  |
Agreed upon reduction to regulatory asset |  |  | $ 3.0 |  |  |  |

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- Definition Discloses the amount of any reduction to the carrying amounts of regulated assets that result from impairment (for example, rate actions of a regulator). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 340 -Name Accounting Standards Codification -Section 35 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481970/980-340-35-1 + Details
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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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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 340 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481878/980-340-50-1 + Details
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