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Income Taxes (Details) (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Income Taxes      
Due to parent $ 82,700,000   $ 100,000
Unrecognized tax benefits 50,200,000    
Unrecognized tax benefits which, if recognized, would impact the company's effective tax rate 22,000,000    
Accrued interest 3,600,000    
Effective tax rate (as a percent) 24.50% 30.60%  
Combined federal and state expected statutory tax rate (as a percent) 39.60% 39.20%  
AEPC
      
Income Taxes      
Due to parent 82,700,000    
Federal taxes paid to AEPC under the Tax Allocation Agreement 0 0  
Accounting Standards Update 2013-11
      
Income Taxes      
Unrecognized tax benefits $ 12,600,000