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Cover - USD ($)
 12 Months Ended
Dec. 31, 2025
Feb. 13, 2026
Jun. 30, 2025
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2025    
Current Fiscal Year End Date --12-31    
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 Post Office 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 Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
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    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction false    
Entity Shell Company false    
Entity Public Float     $ 1,297,190,804
Entity Common Stock, Shares Outstanding   72,875,492  
Entity Central Index Key 0001545654    
Document Fiscal Year Focus 2025    
Document Fiscal Period Focus FY    
Amendment Flag false