Condensed Consolidated Statements of Income (Unaudited) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Operating Revenue:
Real estate leasing	$ 32.7alex_RealEstateLeasingRevenue	$ 31.0alex_RealEstateLeasingRevenue
Real estate development and sales	32.2us-gaap_SalesOfRealEstate	0.8us-gaap_SalesOfRealEstate
Materials and construction	56.9us-gaap_ConstructionMaterialsRevenue	50.1us-gaap_ConstructionMaterialsRevenue
Agribusiness	28.9us-gaap_SalesRevenueGoodsNet	12.9us-gaap_SalesRevenueGoodsNet
Total operating revenue	150.7us-gaap_SalesRevenueNet	94.8us-gaap_SalesRevenueNet
Operating Costs and Expenses:
Cost of real estate leasing	19.6us-gaap_CostOfRealEstateRevenue	19.6us-gaap_CostOfRealEstateRevenue
Cost of real estate development and sales	21.3	(0.1)
Cost of construction contracts and materials	45.8us-gaap_ContractRevenueCost	42.1us-gaap_ContractRevenueCost
Costs of agribusiness revenues	26.8us-gaap_CostOfGoodsSold	9.8us-gaap_CostOfGoodsSold
Selling, general and administrative	14.6	13.4
Gain on the sale of improved property	(1.9)us-gaap_GainLossOnDispositionOfAssets	0us-gaap_GainLossOnDispositionOfAssets
Total operating costs and expenses	126.2us-gaap_CostsAndExpenses	84.8us-gaap_CostsAndExpenses
Operating Income	24.5us-gaap_OperatingIncomeLoss	10.0us-gaap_OperatingIncomeLoss
Other Income and (Expense):
Income related to joint ventures	24.0	(1.6)
Reduction in KRS II carrying value	(0.1)	0
Interest income and other	0.2us-gaap_OtherNonoperatingIncome	0.7us-gaap_OtherNonoperatingIncome
Interest expense	(7.1)us-gaap_InterestExpense	(7.2)us-gaap_InterestExpense
Income From Continuing Operations Before Income Taxes	41.5	1.9
Income tax expense	15.6us-gaap_IncomeTaxExpenseBenefit	0.8us-gaap_IncomeTaxExpenseBenefit
Income From Continuing Operations	25.9	1.1
Income From Discontinued Operations (net of income taxes)	0	34.3
Net Income	25.9us-gaap_ProfitLoss	35.4us-gaap_ProfitLoss
Income attributable to noncontrolling interest	(0.6)	(0.4)
Net Income Attributable to A&B Shareholders	25.3us-gaap_NetIncomeLoss	35.0us-gaap_NetIncomeLoss
Basic Earnings Per Share:
Continuing operations attributable to A&B shareholders (dollars per shares)	$ 0.52	$ 0.01
Discontinued operations attributable to A&B shareholders (dollars per shares)	$ 0.00	$ 0.71
Net income attributable to A&B shareholders (dollars per shares)	$ 0.52us-gaap_EarningsPerShareBasic	$ 0.72us-gaap_EarningsPerShareBasic
Diluted Earnings Per Share:
Continuing operations attributable to A&B shareholders (dollars per shares)	$ 0.51	$ 0.01
Discontinued operations attributable to A&B shareholders (dollars per shares)	$ 0.00	$ 0.70
Net income attributable to A&B shareholders (dollars per shares)	$ 0.51us-gaap_EarningsPerShareDiluted	$ 0.71us-gaap_EarningsPerShareDiluted
Weighted Average Number of Shares Outstanding:
Basic (in shares)	48.8	48.7
Diluted (in shares)	49.3	49.2
Amounts Attributable to A&B Shareholders:
Income from continuing operations, net of tax	25.3	0.7
Discontinued operations, net of tax	0	34.3
Net Income Attributable to A&B	$ 25.3us-gaap_NetIncomeLoss	$ 35.0us-gaap_NetIncomeLoss
Cash dividends declared per share (dollars per share)	$ 0.05	$ 0.04

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