Debt (Schedule Long-Term Indebtedness) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Debt Instrument [Line Items]
Unamortized discount - net	$ (9,700)	$ (6,800)
Deferred financing costs	(36,400)	(24,800)
Long-term debt	4,038,698	3,003,420
Less: Current Portion of Long-term Debt	445,000	445,000
Net Consolidated IPALCO Long-term Debt	3,593,698	2,558,420
Loans and Leases Receivable, Related Parties, Proceeds	92,000
FMB Twenty Seven
Debt Instrument [Line Items]
First mortgage bonds	650,000
Proceeds from Debt, Net of Issuance Costs	640,500
Five Point Seven Five Percent Senior Secured Notes
Debt Instrument [Line Items]
Proceeds from Debt, Net of Issuance Costs	394,000
Indianapolis Power And Light Company [Member]
Debt Instrument [Line Items]
First mortgage bonds	2,769,165	2,128,293
Unamortized discount - net	(8,266)	(6,449)
Long-term debt	$ 2,769,165	2,128,293
Indianapolis Power And Light Company [Member] | First Mortgage Bond 4.55% Due December 2024 [Member]
Debt Instrument [Line Items]
Debt, stated interest rate	3.125%
First mortgage bonds	$ 40,000	40,000
Indianapolis Power And Light Company [Member] | First Mortgage Bond 6.60% Due January 2034 [Member]
Debt Instrument [Line Items]
Debt, stated interest rate	6.60%
First mortgage bonds	$ 100,000	100,000
Indianapolis Power And Light Company [Member] | First Mortgage Bond 6.05% Due October 2036 [Member]
Debt Instrument [Line Items]
Debt, stated interest rate	6.05%
First mortgage bonds	$ 158,800	158,800
Indianapolis Power And Light Company [Member] | First Mortgage Bond 6.60% Due June 2037 [Member]
Debt Instrument [Line Items]
Debt, stated interest rate	6.60%
First mortgage bonds	$ 165,000	165,000
Indianapolis Power And Light Company [Member] | First Mortgage Bond 4.875% Due November 2041 [Member]
Debt Instrument [Line Items]
Debt, stated interest rate	4.875%
First mortgage bonds	$ 140,000	140,000
Indianapolis Power And Light Company [Member] | First Mortgage Bond 4.65% Due June 2043 [Member]
Debt Instrument [Line Items]
Debt, stated interest rate	4.65%
First mortgage bonds	$ 170,000	170,000
Indianapolis Power And Light Company [Member] | First Mortgage Bond 4.50% Due June 2044[Member]
Debt Instrument [Line Items]
Debt, stated interest rate	4.50%
First mortgage bonds	$ 130,000	130,000
Indianapolis Power And Light Company [Member] | First Mortgage Bond 4.70%, Due September 2045 [Member]
Debt Instrument [Line Items]
Debt, stated interest rate	4.70%
First mortgage bonds	$ 260,000	260,000
Indianapolis Power And Light Company [Member] | FMB Twenty [Member]
Debt Instrument [Line Items]
Debt, stated interest rate	4.05%
First mortgage bonds	$ 350,000	350,000
Indianapolis Power And Light Company [Member] | FMB Twenty - one [Member]
Debt Instrument [Line Items]
Debt, stated interest rate	4.875%
First mortgage bonds	$ 105,000	105,000
Indianapolis Power And Light Company [Member] | FMB Twenty - two
Debt Instrument [Line Items]
Debt, stated interest rate	0.75%
First mortgage bonds	$ 30,000	30,000
Indianapolis Power And Light Company [Member] | FMB Twenty - three
Debt Instrument [Line Items]
Debt, stated interest rate	0.95%
First mortgage bonds	$ 60,000	60,000
Indianapolis Power And Light Company [Member] | FMB Twenty - four
Debt Instrument [Line Items]
Debt, stated interest rate	1.40%
First mortgage bonds	$ 55,000	55,000
Indianapolis Power And Light Company [Member] | FMB Twenty - five
Debt Instrument [Line Items]
Debt, stated interest rate	0.65%
First mortgage bonds	$ 40,000	40,000
Indianapolis Power And Light Company [Member] | First Mortgage Bond Twenty Six
Debt Instrument [Line Items]
Debt, stated interest rate	5.65%
First mortgage bonds	$ 350,000	350,000
Indianapolis Power And Light Company [Member] | FMB Twenty Seven
Debt Instrument [Line Items]
Debt, stated interest rate	5.70%
First mortgage bonds	$ 650,000	0
Indianapolis Power And Light Company [Member] | $300M Term Loan
Debt Instrument [Line Items]
Short-Term Bank Loans and Notes Payable	300,000
Ipalco Enterprises, Inc. [Member]
Debt Instrument [Line Items]
Unamortized discount - net	(1,423)	(319)
Deferred financing costs	(9,044)	(4,554)
Net Consolidated IPALCO Long-term Debt	1,269,533	875,127
Ipalco Enterprises, Inc. [Member] | 5.00% Senior Secured Notes [Member]
Debt Instrument [Line Items]
Long-term debt	$ 400,000	0
Ipalco Enterprises, Inc. [Member] | Three Point Seven Zero Percent Senior Secured Notes [Domain]
Debt Instrument [Line Items]
Debt, stated interest rate	3.70%
Long-term debt	$ 405,000	405,000
Ipalco Enterprises, Inc. [Member] | Four Point Two Five Percent Senior Secured Notes
Debt Instrument [Line Items]
Debt, stated interest rate	4.25%
Long-term debt	$ 475,000	475,000
Parent | Five Point Seven Five Percent Senior Secured Notes
Debt Instrument [Line Items]
Debt, stated interest rate	5.75%
First Mortgage Bonds [Member] | Indianapolis Power And Light Company [Member]
Debt Instrument [Line Items]
Deferred financing costs	$ (26,369)	$ (19,058)
Line of Credit [Member] | Committed Line of Credit [Member]
Debt Instrument [Line Items]
Line of credit, outstanding borrowings	$ 195,000		$ 155,000