Cover Page	3 Months Ended
	Mar. 31, 2020 shares
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2020
Document Transition Report	false
Entity File Number	001-35492
Entity Registrant Information	ALEXANDER & BALDWIN, INC.
Entity Incorporation, State or Country Code	HI
Entity Tax Identification Number	45-4849780
Entity Address, Address Line One	P. O. Box 3440,
Entity Address, City or Town	Honolulu,
Entity Address, State or Province	HI
Entity Address, Postal Zip Code	96801
City Area Code	808
Local Phone Number	525-6611
Title of 12(b) Security	Common Stock, without par value
Trading Symbol	ALEX
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)	72,306,508
Entity Central Index Key	0001545654
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
Amendment Flag	false