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Basis of Presentation (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
The effect to current period income tax expense and net income due to out of period adjustment   $ 1.6us-gaap_IncomeTaxReconciliationPriorYearIncomeTaxes
Tax effect per diluted share (in dollars per share)   $ 0.03alex_IncomeLossfromContinuingOperationsTaxEffectperDilutedShare
Income from continuing operations, net of tax 25.9us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest 1.1us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Out of Period Tax Adjustments    
Income from continuing operations, net of tax   $ 1.6us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis
= alex_OutofPeriodTaxAdjustmentsMember