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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2020
Feb. 12, 2021
Jun. 30, 2020
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 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 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    
Entity Public Float     $ 1,584,425,974
Entity Common Stock, Shares Outstanding   72,469,682  
Entity Shell Company false    
Documents Incorporated by Reference
Documents Incorporated By Reference
Portions of Registrant’s Proxy Statement for the 2021 Annual Meeting of Shareholders (Part III of Form 10-K)
    
Entity Central Index Key 0001545654    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Amendment Flag false