Background and Basis of Presentation	9 Months Ended
Background and Basis of Presentation	Sep. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Background and Basis of Presentation	Background and Basis of Presentation Description of Business: Alexander & Baldwin, Inc. ("A&B" or the "Company") is a fully integrated real estate investment trust ("REIT") headquartered in Honolulu, Hawai‘i, whose history in Hawai‘i dates back to 1870. Over time, the Company has evolved from a 571-acre sugar plantation on Maui to become one of Hawai‘i's premier commercial real estate companies and the owner of the largest grocery-anchored, neighborhood shopping center portfolio in the state. The Company operates in two segments: Commercial Real Estate ("CRE") and Land Operations. As of September 30, 2023, the Company's commercial real estate portfolio resides entirely in Hawai‘i and consists of 22 retail centers, 13 industrial assets and four office properties, representing a total of 3.9 million square feet of gross leasable area ("GLA"), as well as 142.0 acres of land under ground leases. Throughout this quarterly report on Form 10-Q, references to "we," "our," "us" and "our Company" refer to Alexander & Baldwin, Inc., together with its consolidated subsidiaries. Basis of Presentation: The interim condensed consolidated financial statements are unaudited. Because of the nature of the Company's operations, the results for interim periods are not necessarily indicative of results to be expected for the year. While these condensed consolidated financial statements reflect all normal recurring adjustments that are, in the opinion of management, necessary for fair presentation of the results of the interim period, they do not include all of the information and footnotes required by accounting principles generally accepted in the United States of America ("GAAP") for complete financial statements. Therefore, the interim condensed consolidated financial statements should be read in conjunction with the consolidated balance sheets as of December 31, 2022 and 2021, and the related consolidated statements of operations, comprehensive income (loss), cash flows, and equity and redeemable noncontrolling interest for each of the three years ended December 31, 2022, 2021, and 2020, respectively, and the notes thereto included in the Company's Annual Report filed on Form 10-K for the year ended December 31, 2022 ("2022 Form 10-K"), and other subsequent filings with the U.S. Securities and Exchange Commission ("SEC"). Reclassifications: Prior to December 31, 2022, the Company operated and reported on three segments: Commercial Real Estate; Land Operations; and Materials & Construction ("M&C"). During the fourth quarter of 2022, the Company's wholly-owned subsidiary, Grace Pacific LLC ("Grace Pacific") and Company-owned quarry land on Maui ("Maui Quarries") (collectively, the "Grace Disposal Group"), which made up the majority of activity in the Company’s former M&C segment, met the criteria for classification as held for sale and discontinued operations. Accordingly, the assets and liabilities associated with the Grace Disposal Group are classified as held for sale in the condensed consolidated balance sheets, its financial results are classified as discontinued operations in the condensed consolidated statements of operations and cash flows for all periods presented, and the Company’s former Materials and Construction ("M&C") segment has been eliminated. As a result of this strategic shift, the chief operating decision maker began reviewing all investments in unconsolidated affiliates together within the Land Operations segment. This change resulted in a reorganization to present the income (loss) related to one joint venture, which historically was included in the results of the former M&C segment, to now be included in the results of the Land Operations segment. All comparable information for the historical periods has been retrospectively adjusted to reflect the impact of these changes. Refer to Note 18 – Held for Sale and Discontinued Operations for additional information regarding the Grace Disposal Group, including the assets held for sale, liabilities associated with held for sale and income (loss) from discontinued operations. Unless otherwise noted, disclosures within the remaining notes to these condensed consolidated financial statements relate solely to the Company's continuing operations. Rounding: Amounts in the condensed consolidated financial statements and notes are rounded to the nearest tenth of a million. Accordingly, a recalculation of some per-share amounts and percentages, if based on the reported data, may result in differences.