Cover	9 Months Ended
	Sep. 30, 2025 shares
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2025
Document Transition Report	false
Securities Act 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	822 Bishop Street
Entity Address, Address Line Two	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	72,758,460
Entity Central Index Key	0001545654
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	Q3
Amendment Flag	false