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REGULATORY ENVIRONMENT - RECOVERY OF NATURAL GAS COSTS (Details) - USD ($) |  | 1 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 30, 2021 | Feb. 28, 2021 | Mar. 31, 2021 | Dec. 31, 2020
Public Utilities, General Disclosures [Line Items] |  |  |  |
Amounts recoverable from customers |  |  | $ 306,700,000 | $ 20,000,000.0
Public Service Commission of Wisconsin (PSCW) | Excess Natural Gas Costs |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Recovery period of regulatory asset | 3 months |  |  |
Illinois Commerce Commission (ICC) | Excess Natural Gas Costs |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Recovery period of regulatory asset |  | 12 months |  |
WE | Public Service Commission of Wisconsin (PSCW) | Excess Natural Gas Costs |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Amounts recoverable from customers | $ 54,000,000 |  |  |
WG | Public Service Commission of Wisconsin (PSCW) | Excess Natural Gas Costs |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Amounts recoverable from customers | 24,000,000 |  |  |
WPS | Public Service Commission of Wisconsin (PSCW) | Excess Natural Gas Costs |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Amounts recoverable from customers | $ 28,000,000 |  |  |
Recovery period of regulatory asset | 3 months |  |  |
PGL | Illinois Commerce Commission (ICC) | Excess Natural Gas Costs |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Amounts recoverable from customers |  | $ 131,000,000 |  |
NSG | Illinois Commerce Commission (ICC) | Excess Natural Gas Costs |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Amounts recoverable from customers |  | 10,000,000 |  |
MERC | Minnesota Public Utilities Commission (MPUC) | Excess Natural Gas Costs |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Amounts recoverable from customers |  | $ 75,000,000 |  |
Recovery period of regulatory asset |  | 12 months |  |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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