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Pension And Other Postretirement Benefits (Schedule Of Fair Value Of Pension Plan Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]      
Fair value of benefit plan assets $ 657,239 $ 561,586 $ 495,082
Percentage by asset category 100.00% 100.00%  
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of benefit plan assets $ 656,929 $ 386,340  
Significant Observable Inputs (Level 2) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of benefit plan assets 310 175,246  
Short-Term Investments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of benefit plan assets $ 2,575 $ 55,273  
Percentage by asset category 0.00% 10.00%  
Short-Term Investments [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of benefit plan assets $ 2,575 $ 55,273  
Corporate Stocks - Common [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of benefit plan assets   $ 45,875  
Percentage by asset category   8.00%  
Corporate Stocks - Common [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of benefit plan assets   $ 45,875  
U.S. Equities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of benefit plan assets $ 325,370 $ 182,251  
Percentage by asset category 50.00% 33.00%  
U.S. Equities [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of benefit plan assets $ 325,370 $ 182,251  
International Equities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of benefit plan assets $ 56,662 $ 37,125  
Percentage by asset category 9.00% 7.00%  
International Equities [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of benefit plan assets $ 56,662 $ 37,125  
Fixed Income [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of benefit plan assets $ 205,409 $ 1,568  
Percentage by asset category 31.00% 0.00%  
Fixed Income [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of benefit plan assets $ 205,409 $ 1,568  
US Treasury Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of benefit plan assets $ 66,913 $ 23,649  
Percentage by asset category 10.00% 4.00%  
US Treasury Securities [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of benefit plan assets $ 66,913 $ 23,649  
US Government Agencies Debt Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of benefit plan assets   $ 8,103  
Percentage by asset category   2.00%  
US Government Agencies Debt Securities [Member] | Significant Observable Inputs (Level 2) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of benefit plan assets   $ 8,103  
Corporate Bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of benefit plan assets   $ 159,393  
Percentage by asset category   28.00%  
Corporate Bonds [Member] | Significant Observable Inputs (Level 2) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of benefit plan assets   $ 159,393  
Hedge Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of benefit plan assets $ 310 $ 7,750  
Percentage by asset category 0.00% 1.00%  
Hedge Funds [Member] | Significant Observable Inputs (Level 2) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of benefit plan assets $ 310 $ 7,750  
Other Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of benefit plan assets   $ 40,599  
Percentage by asset category   7.00%  
Other Funds [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of benefit plan assets   $ 40,599  
Indianapolis Power And Light Company [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of benefit plan assets $ 657,239 $ 561,586 $ 495,082
Percentage by asset category 100.00% 100.00%  
Indianapolis Power And Light Company [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of benefit plan assets $ 656,929 $ 386,340  
Indianapolis Power And Light Company [Member] | Significant Observable Inputs (Level 2) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of benefit plan assets 310 175,246  
Indianapolis Power And Light Company [Member] | Short-Term Investments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of benefit plan assets $ 2,575 $ 55,273  
Percentage by asset category 0.00% 10.00%  
Indianapolis Power And Light Company [Member] | Short-Term Investments [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of benefit plan assets $ 2,575 $ 55,273  
Indianapolis Power And Light Company [Member] | Corporate Stocks - Common [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of benefit plan assets   $ 45,875  
Percentage by asset category   8.00%  
Indianapolis Power And Light Company [Member] | Corporate Stocks - Common [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of benefit plan assets   $ 45,875  
Indianapolis Power And Light Company [Member] | U.S. Equities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of benefit plan assets $ 325,370 $ 182,251  
Percentage by asset category 50.00% 33.00%  
Indianapolis Power And Light Company [Member] | U.S. Equities [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of benefit plan assets $ 325,370 $ 182,251  
Indianapolis Power And Light Company [Member] | International Equities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of benefit plan assets $ 56,662 $ 37,125  
Percentage by asset category 9.00% 7.00%  
Indianapolis Power And Light Company [Member] | International Equities [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of benefit plan assets $ 56,662 $ 37,125  
Indianapolis Power And Light Company [Member] | Fixed Income [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of benefit plan assets $ 205,409 $ 1,568  
Percentage by asset category 31.00% 0.00%  
Indianapolis Power And Light Company [Member] | Fixed Income [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of benefit plan assets $ 205,409 $ 1,568  
Indianapolis Power And Light Company [Member] | US Treasury Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of benefit plan assets $ 66,913 $ 23,649  
Percentage by asset category 10.00% 4.00%  
Indianapolis Power And Light Company [Member] | US Treasury Securities [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of benefit plan assets $ 66,913 $ 23,649  
Indianapolis Power And Light Company [Member] | US Government Agencies Debt Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of benefit plan assets   $ 8,103  
Percentage by asset category   2.00%  
Indianapolis Power And Light Company [Member] | US Government Agencies Debt Securities [Member] | Significant Observable Inputs (Level 2) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of benefit plan assets   $ 8,103  
Indianapolis Power And Light Company [Member] | Corporate Bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of benefit plan assets   $ 159,393  
Percentage by asset category   28.00%  
Indianapolis Power And Light Company [Member] | Corporate Bonds [Member] | Significant Observable Inputs (Level 2) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of benefit plan assets   $ 159,393  
Indianapolis Power And Light Company [Member] | Hedge Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of benefit plan assets $ 310 $ 7,750  
Percentage by asset category 0.00% 1.00%  
Indianapolis Power And Light Company [Member] | Hedge Funds [Member] | Significant Observable Inputs (Level 2) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of benefit plan assets $ 310 $ 7,750  
Indianapolis Power And Light Company [Member] | Other Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of benefit plan assets   $ 40,599  
Percentage by asset category   7.00%  
Indianapolis Power And Light Company [Member] | Other Funds [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of benefit plan assets   $ 40,599