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Risks and Uncertainties (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2020
Unusual Risk or Uncertainty [Line Items]          
Unusual Risks and Uncertainties        
As the economic impact of the COVID-19 pandemic started to materialize in Indiana in the second half of March 2020 and continued for the duration of 2020, the COVID-19 pandemic primarily impacted our retail sales demand as shown by the changes in weather-normalized volumes of kWh sold compared to the weather-normalized volumes for the same periods in 2019:

Customer classFor the three months endedFor the year ended
March 31, 2020June 30, 2020September 30, 2020 December 31, 2020December 31, 2020
Residential1.6 %6.6 %3.9 %2.4 %3.4 %
Small commercial and industrial(1.8)%(10.3)%(4.2)%(5.3)%(5.2)%
Large commercial and industrial(2.8)%(11.0)%(7.9)%(5.7)%(6.9)%
Subsidiaries [Member]          
Unusual Risk or Uncertainty [Line Items]          
Unusual Risks and Uncertainties        
As the economic impact of the COVID-19 pandemic started to materialize in Indiana in the second half of March 2020 and continued for the duration of 2020, the COVID-19 pandemic primarily impacted our retail sales demand as shown by the changes in weather-normalized volumes of kWh sold compared to the weather-normalized volumes for the same periods in 2019:

Customer classFor the three months endedFor the year ended
March 31, 2020June 30, 2020September 30, 2020 December 31, 2020December 31, 2020
Residential1.6 %6.6 %3.9 %2.4 %3.4 %
Small commercial and industrial(1.8)%(10.3)%(4.2)%(5.3)%(5.2)%
Large commercial and industrial(2.8)%(11.0)%(7.9)%(5.7)%(6.9)%
Residential          
Unusual Risk or Uncertainty [Line Items]          
Percentage Increase/Decrease in weather-normalized volumes of kWh sold 2.40% 3.90% 6.60% 1.60% 3.40%
Residential | Subsidiaries [Member]          
Unusual Risk or Uncertainty [Line Items]          
Percentage Increase/Decrease in weather-normalized volumes of kWh sold 2.40% 3.90% 6.60% 1.60% 3.40%
Small Commercial and Industrial          
Unusual Risk or Uncertainty [Line Items]          
Percentage Increase/Decrease in weather-normalized volumes of kWh sold (5.30%) (4.20%) (10.30%) (1.80%) (5.20%)
Small Commercial and Industrial | Subsidiaries [Member]          
Unusual Risk or Uncertainty [Line Items]          
Percentage Increase/Decrease in weather-normalized volumes of kWh sold (5.30%) (4.20%) (10.30%) (1.80%) (5.20%)
Large Commercial and Industrial          
Unusual Risk or Uncertainty [Line Items]          
Percentage Increase/Decrease in weather-normalized volumes of kWh sold (5.70%) (7.90%) (11.00%) (2.80%) (6.90%)
Large Commercial and Industrial | Subsidiaries [Member]          
Unusual Risk or Uncertainty [Line Items]          
Percentage Increase/Decrease in weather-normalized volumes of kWh sold (5.70%) (7.90%) (11.00%) (2.80%) (6.90%)