Discloses the amount of any reduction to the carrying amounts of regulated assets that result from impairment (for example, rate actions of a regulator).

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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Balance Type:	credit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ 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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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	instant

- Definition

The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period.

+ 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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Period Type:	instant

- 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

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- Definition

Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer.

+ References

+ Details

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- Definition

Number of utilities filing a joint proposal

+ References

No definition available.

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- Details

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- Details

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- Details

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- Details

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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