Debt (Schedule Of Maturities On Long-Term Indebtedness) (Details) $ in Thousands	Dec. 31, 2017 USD ($)
Entity Information [Line Items]
2016	$ 0
2017	0
2018	495,000
2019	95,000
2020	0
Thereafter	1,918,800
Total	2,508,800
Indianapolis Power And Light Company [Member]
Entity Information [Line Items]
2016	0
2017	0
2018	90,000
2019	95,000
2020	0
Thereafter	1,513,800
Total	$ 1,698,800