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Retirement and Share-based Compensation Plans (Employee Stock Ownership Plan) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
ESOP, requisite service period 6 months
ESOP, vesting percentage 100.00%ael_EmployeeStockOwnershipPlanVestingPercentage
ESOP, vesting period 2 years
ESOP, employer loan amount $ 7.0ael_EmployeeStockOwnershipPlanEmployerLoanAmount
ESOP, shares purchased with ESOP employer loan 650,000ael_EmployeeStockOwnershipPlanSharePurchaseWithEsopEmployerLoan
ESOP, debt structure, employer loan, duration 20 years