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PROPERTY, PLANT, AND EQUIPMENT (Details) - Public Service Building - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Mar. 31, 2021
Property, plant, and equipment
Costs incurred for repairs and restorations		$ 49.3
Insurance proceeds received	$ 20.0
Receivable for future insurance recoveries		$ 16.8
Costs included in other operation and maintenance	$ 12.5

X

- Definition

Amount due in settlement of a claim for reimbursement from an insurance company when the Company has suffered a loss covered under an insurance policy. For classified balance sheets, represents the current amount receivable, that is amounts expected to be collected within one year or the normal operating cycle, if longer.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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- Definition

Amount of cash inflow for proceeds from settlement of insurance claim, classified as investing activities. Excludes insurance settlement classified as operating activities.

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-Topic 230
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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

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- Definition

Amount of other operating expense of regulated operation.

+ References

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-Topic 220
-SubTopic 10
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Total costs incurred for repairs and restorations. Includes costs that were capitalized and expensed.

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