Business Segment Information (Details) $ in Thousands	12 Months Ended
Dec. 31, 2019 USD ($) segment	Dec. 31, 2018 USD ($)
Debt Instrument [Line Items]
Cash	$ 6,000	$ 6,400
Long-term nonutility investments	2,800	4,000
Interest Rate Cash Flow Hedge Liability at Fair Value	$ 26,600	$ 0
Nonutility assets representation rate, (percent, less than)	1.00%	1.00%
Indianapolis Power And Light Company
Debt Instrument [Line Items]
Reportable segments \| segment	1

Nonutility assets representation rate, percentage

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- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

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- 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.

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- Definition

Fair value as of the balance sheet date of all interest rate derivative liabilities designated as cash flow hedging instruments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)(1)
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- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

No definition available.

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- Definition

Amount of long-term investments classified as other.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
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