Consolidated Statements of Equity (USD $) In Millions, except Per Share data, unless otherwise specified	Total	Common Stock	Net Investment	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Noncontrolling Interest
Balance, beginning period at Dec. 31, 2011	$ 724.0	$ 0	$ 771.6	$ (47.6)	$ 0	$ 0
Balance, beginning period (shares) at Dec. 31, 2011		0
Increase (Decrease) in Equity [Roll Forward]
Net income	18.8		(1.6)		20.4
Other comprehensive income, net of tax	0.4			0.4
Contribution from Alexander & Baldwin Holdings, Inc., net	154.5		154.5
Conversion of net investment of Alexander & Baldwin Holdings, Inc. into common stock (shares)		42.4
Conversion of net investment of Alexander & Baldwin Holdings, Inc. into common stock	0	924.5	(924.5)
Share-based compensation	2.1	2.1
Shares issued or repurchased, net (in shares)		0.5
Shares issued or repurchased, net	9.9	10.2			(0.3)
Excess tax benefit from share-based awards	1.2	1.2
Balance, period end at Dec. 31, 2012	910.9	938.0	0	(47.2)	20.1	0
Balance, period end (shares) at Dec. 31, 2012		42.9
Increase (Decrease) in Equity [Roll Forward]
Net income	34.8				34.3	0.5
Other comprehensive income, net of tax	17.1			17.1
Dividends paid on common stock	(2.0)				(2.0)
Distributions to non-controlling interest	(0.7)					(0.7)
Share-based compensation	4.2	4.2
Grace acquisition (shares)		5.4
Grace acquisition	205.4	196.3				9.1
Shares issued or repurchased, net (in shares)		0.3
Shares issued or repurchased, net	(2.6)	0.4			(3.0)
Excess tax benefit from share-based awards	1.6	1.6
Dividend declared (in dollars per share)	$ 0.04
Balance, period end at Dec. 31, 2013	1,168.7	1,140.5	0	(30.1)	49.4	8.9
Balance, period end (shares) at Dec. 31, 2013		48.6
Increase (Decrease) in Equity [Roll Forward]
Net income	64.5				61.4	3.1
Other comprehensive income, net of tax	(14.3)			(14.3)
Dividends paid on common stock	(8.3)				(8.3)
Distributions to non-controlling interest	(1.1)					(1.1)
Share-based compensation	4.9	4.9
Shares issued or repurchased, net (in shares)		0.2
Shares issued or repurchased, net	(0.9)	0.6			(1.5)
Excess tax benefit from share-based awards	1.3	1.3
Dividend declared (in dollars per share)	$ 0.17
Balance, period end at Dec. 31, 2014	$ 1,214.8	$ 1,147.3	$ 0	$ (44.4)	$ 101.0	$ 10.9
Balance, period end (shares) at Dec. 31, 2014		48.8