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Benefit Plans (Details 13) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Benefit Plans    
Accumulated benefit obligation $ 270,300,000us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation $ 230,400,000us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation
Unfunded Retirement Plans    
Benefit Plans    
Accumulated Benefit Obligation, unfunded plans 15,100,000us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= af_UnfundedPensionPlansDefinedBenefitMember
13,100,000us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= af_UnfundedPensionPlansDefinedBenefitMember
Projected benefit obligation, unfunded plans $ 15,100,000us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= af_UnfundedPensionPlansDefinedBenefitMember
$ 13,100,000us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= af_UnfundedPensionPlansDefinedBenefitMember