Condensed Consolidated Statements of Equity - USD ($) $ in Millions	Total	A&B Share- holders' Equity	Non- controlling interest
Beginning balance at Dec. 31, 2013	$ 1,168.7	$ 1,159.8	$ 8.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	45.6	44.2	1.4
Other comprehensive income, net of tax	1.7	1.7
Dividends paid on common stock	(3.9)	(3.9)
Share-based compensation	2.4	2.4
Shares issued or repurchased, net	(1.3)	(1.3)
Excess tax benefit from share-based awards	1.3	1.3
Ending balance at Jun. 30, 2014	1,214.5	1,204.2	10.3
Beginning balance at Dec. 31, 2014	1,214.8	1,203.9	10.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	36.0	35.1	0.9
Other comprehensive income, net of tax	1.3	1.3
Dividends paid on common stock	(4.9)	(4.9)
Share-based compensation	2.3	2.3
Shares issued or repurchased, net	(1.0)	(1.0)
Excess tax benefit from share-based awards	0.5	0.5
Ending balance at Jun. 30, 2015	$ 1,249.0	$ 1,237.2	$ 11.8