Alexander & Baldwin (ALEX) 10-K 26 Feb 21 2020 FY Annual report Financial data

Cover Page

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

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
ASSETS
Real estate property	$ 1,549.7	$ 1,540.2
Accumulated depreciation	(154.4)	(127.5)
Real estate property, net	1,395.3	1,412.7
Real estate developments	75.7	79.1
Investments in real estate joint ventures and partnerships	134.1	133.4
Real estate intangible assets, net	61.9	74.9
Real estate investments, net	1,667	1,700.1
Cash and cash equivalents	57.2	15.2
Restricted cash	0.2	0.2
Accounts receivable and retention, net of allowances (credit losses and doubtful accounts) of $3.3 million and $0.6 million as of December 31, 2020 and 2019, respectively	43.5	51.6
Inventories	18.4	20.7
Other property, net	110.8	124.4
Operating lease right-of-use assets	18.6	21.8
Goodwill	10.5	15.4
Other receivables, net of allowances of $3.9 million and $1.6 million as of December 31, 2020 and December 31, 2019, respectively	14.2	27.8
Prepaid expenses and other assets	95.6	107.1
Total assets	2,036	2,084.3
Liabilities:
Notes payable and other debt	687.1	704.6
Accounts payable	9.8	17.8
Operating lease liabilities	18.4	21.6
Accrued pension and post-retirement benefits	34.7	26.8
Deferred revenue	66.9	67.6
Accrued and other liabilities	116.5	110.9
Total liabilities	933.4	949.3
Commitments and Contingencies (Note 12)
Redeemable Noncontrolling Interest (Note 2)	6.5	6.3
Equity:
Common stock - no par value; authorized, 150.0 million shares; outstanding 72.4 million and 72.3 million shares as of December 31, 2020 and 2019, respectively	1,805.5	1,800.1
Accumulated other comprehensive income (loss)	(60)	(48.8)
Distributions in excess of accumulated earnings	(649.4)	(626.2)
Total A&B shareholders' equity	1,096.1	1,125.1
Noncontrolling interest	0	3.6
Total equity	1,096.1	1,128.7
Total liabilities and equity	$ 2,036	$ 2,084.3

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Allowance for credit losses on Accounts receivable and retention	$ 3.3	$ 0.6
Allowance for credit losses on Other receivables	$ 3.9	$ 1.6
Common stock authorized (shares)	150,000,000	150,000,000
Common stock outstanding (shares)	72,400,000	72,300,000

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating Revenue:
Total operating revenue	$ 305.3	$ 435.2	$ 644.4
Operating Costs and Expenses:
Selling, general and administrative	46.1	58.9	61.2
Impairment of assets	5.6	49.7	79.4
Total operating costs and expenses	285.2	449.5	523
Gain (loss) on disposal of commercial real estate properties, net	0.5	0	51.4
Gain (loss) on disposal of non-core assets, net	9.1	0	0
Total gain (loss) on disposal of assets, net	9.6	0	51.4
Operating Income (Loss)	29.7	(14.3)	172.8
Other Income and (Expenses):
Income (loss) related to joint ventures	5.9	5.3	(4.1)
Impairment of equity method investment	0	0	(188.6)
Interest and other income (expense), net (Note 2)	0.3	3.2	2.3
Interest expense	(30.3)	(33.1)	(35.3)
Income (Loss) from Continuing Operations Before Income Taxes	5.6	(38.9)	(52.9)
Income tax benefit (expense)	0.4	2	(16.3)
Income (Loss) from Continuing Operations	6	(36.9)	(69.2)
Income (loss) from discontinued operations, net of income taxes	(0.8)	(1.5)	(0.6)
Net Income (Loss)	5.2	(38.4)	(69.8)
Loss (income) attributable to noncontrolling interest	0.4	2	(2.2)
Net Income (Loss) Attributable to A&B Shareholders	$ 5.6	$ (36.4)	$ (72)
Basic Earnings (Loss) Per Share of Common Stock:
Continuing operations available to A&B shareholders (in dollars per share)	$ 0.09	$ (0.49)	$ (1.01)
Discontinued operations available to A&B shareholders (in dollars per share)	(0.01)	(0.02)	(0.01)
Net income (loss) available to A&B shareholders (in dollars per share)	0.08	(0.51)	(1.02)
Diluted Earnings (Loss) Per Share of Common Stock:
Continuing operations available to A&B shareholders (in dollars per share)	0.09	(0.49)	(1.01)
Discontinued operations available to A&B shareholders (in dollars per share)	(0.01)	(0.02)	(0.01)
Net income (loss) available to A&B shareholders (in dollars per share)	$ 0.08	$ (0.51)	$ (1.02)
Weighted-Average Number of Shares Outstanding:
Basic (in shares)	72.3	72.2	70.6
Diluted (in shares)	72.4	72.2	70.6
Amounts available to A&B Common Shareholders
Continuing operations available to A&B common shareholders	$ 6.3	$ (35.1)	$ (71.4)
Discontinued operations available to A&B common shareholders	(0.8)	(1.5)	(0.6)
Net income (loss) available to A&B common shareholders	5.5	(36.6)	(72)
Commercial Real Estate
Operating Revenue:
Commercial Real Estate	150	160.6	140.3
Operating Costs and Expenses:
Cost of Commercial Real Estate	95.6	89	77.2
Land Operations
Operating Revenue:
Revenues	40.6	114.1	289.5
Operating Costs and Expenses:
Operating costs	31.1	92.5	117.1
Materials & Construction
Operating Revenue:
Revenues	114.7	160.5	214.6
Operating Costs and Expenses:
Operating costs	$ 106.8	$ 159.4	$ 188.1

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ 5.2	$ (38.4)	$ (69.8)
Cash flow hedges:
Unrealized interest rate hedging gain (loss)	(6.9)	(4)	1
Impact of reclassification adjustment to interest expense included in Net Income (Loss)	1	(0.1)	0
Employee benefit plans:
Actuarial gain (loss)	(7.7)	5.3	(4.9)
Amortization of net loss included in net periodic benefit cost	2.5	4	4.6
Prior service cost	(0.1)	0	0
Amortization of prior service credit included in net periodic benefit cost	0	(0.7)	(0.7)
Curtailment (gain)/loss	0	(1.4)	(0.6)
Settlement (gain)/loss	0	0	0.1
Income taxes related to other comprehensive income (loss)	0	0	0
Other comprehensive income (loss), net of tax	(11.2)	3.1	(0.5)
Comprehensive Income (Loss)	(6)	(35.3)	(70.3)
Comprehensive income (loss) attributable to noncontrolling interest	0.4	2	(2.2)
Comprehensive Income (Loss) Attributable to A&B Shareholders	$ (5.6)	$ (33.3)	$ (72.5)

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash Flows from Operating Activities:
Net income (loss)	$ 5.2	$ (38.4)	$ (69.8)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operations:
Depreciation and amortization	53.3	50.5	42.8
Deferred income taxes	0	0	16.6
Loss (gain) from disposals and asset transactions, net	(9.5)	(2.6)	(54)
Impairment of assets	5.6	49.7	268
Share-based compensation expense	5.8	5.4	4.7
Equity in (income) loss from affiliates, net of operating cash distributions	(4.8)	(1.4)	12.9
Changes in operating assets and liabilities:
Trade, contracts retention, and other contract receivables	8.8	8.5	(4.2)
Inventories	2.1	5.7	5.5
Prepaid expenses, income tax receivable and other assets	13	28.5	(13.2)
Development/other property inventory	3.6	56.8	31.8
Accrued pension and post-retirement benefits	2.7	4.6	3.6
Accounts payable	(6.2)	(12.9)	(9)
Accrued and other liabilities	(16.5)	3.2	74.2
Net cash provided by (used in) operations	63.1	157.6	309.9
Cash Flows from Investing Activities:
Capital expenditures for acquisitions	0	(218.4)	(241.7)
Capital expenditures for property, plant and equipment	(25.1)	(36.7)	(54.4)
Proceeds from disposal of assets	27.1	4.4	171.7
Payments for purchases of investments in affiliates and other investments	(1)	(3.3)	(22.6)
Distributions of capital from investments in affiliates and other investments	11	13.6	42.3
Net cash provided by (used in) investing activities	12	(240.4)	(104.7)
Cash Flows from Financing Activities:
Proceeds from issuance of notes payable and other debt	173	125.9	548.4
Payments of notes payable and other debt and deferred financing costs	(183)	(203.9)	(467.8)
Borrowings (payments) on line-of-credit agreement, net	(8.7)	(0.3)	4.7
Distribution to noncontrolling interests	0	(0.3)	(0.7)
Cash dividends paid	(13.8)	(50)	(156.6)
Proceeds from issuance (payments for repurchases) of capital stock and other, net	(0.6)	(1)	(1.5)
Payment of deferred acquisition holdback	0	(7.1)	0
Net cash provided by (used in) financing activities	(33.1)	(136.7)	(73.5)
Cash, Cash Equivalents and Restricted Cash
Net increase (decrease) in cash, cash equivalents and restricted cash	42	(219.5)	131.7
Balance, beginning of period	15.4	234.9	103.2
Balance, end of period	57.4	15.4	234.9
Other Cash Flow Information:
Interest paid, net of capitalized interest	(29)	(32.5)	(34.4)
Income tax (payments)/refunds, net	0.5	25.8	2.6
Noncash Investing and Financing Activities:
Capital expenditures included in accounts payable and accrued and other liabilities	2.9	4.4	1.4
Fair value of loan assumed in connection with acquisition	0	0	61
Operating lease liabilities arising from obtaining ROU assets	0.4	31
Finance lease liabilities arising from obtaining ROU assets	0.9	3.4
Issuance of shares for stock dividend	0	0	626.4
Dividends declared	10.9	0	0
Reconciliation of cash, cash equivalents and restricted cash:
Cash and cash equivalents, beginning of period	15.2	11.4	68.9
Restricted cash, beginning of period	0.2	223.5	34.3
Balance, beginning of period	15.4	234.9	103.2
Cash and cash equivalents, end of period	57.2	15.2	11.4
Restricted cash, end of period	0.2	0.2	223.5
Balance, end of period	$ 57.4	$ 15.4	$ 234.9

Consolidated Statements of Equi

Consolidated Statements of Equity - USD ($) shares in Millions, $ in Millions	Total	Impact of adoption of new accounting standards	Common Stock	Accumulated Other Compre- hensive Income (Loss)	Accumulated Other Compre- hensive Income (Loss)Impact of adoption of new accounting standards	(Distribution in Excess of Accumulated Earnings) Earnings Surplus	(Distribution in Excess of Accumulated Earnings) Earnings SurplusImpact of adoption of new accounting standards	Non-Controlling Interest	Non-Controlling InterestImpact of adoption of new accounting standards	Redeem- able Non- Controlling Interest
Beginning balance (in shares) at Dec. 31, 2017			49.3
Beginning balance at Dec. 31, 2017	$ 651.1	$ (1.4)	$ 1,161.7	$ (42.3)	$ (9.1)	$ (473)	$ 7.7	$ 4.7
Total Equity
Net income (loss)	(70.5)					(72)		1.5
Other comprehensive income (loss), net of tax	(0.5)			(0.5)
Stock dividend ($11.65 per share) (in shares)			22.6
Stock dividend ($11.65 per share)	626.4		$ 626.4
Disposal of M&C subsidiary and Distributions to noncontrolling interest	(0.5)							(0.5)		$ (0.2)
Adjustments to redemption value of redeemable noncontrolling interest (Note 2)	0.6		0.6
Share-based compensation	4.7		$ 4.7
Shares issued or repurchased, net (in shares)			0.1
Shares issued or repurchased, net	(1.6)					(1.6)
Ending balance at Dec. 31, 2018	1,208.3		$ 1,793.4	(51.9)		(538.9)		5.7
Ending balance (in shares) at Dec. 31, 2018			72
Redeemable Non-Controlling Interest, beginning balance at Dec. 31, 2017										8
Redeemable Non-Controlling Interest
Net income (loss)	0									0.7
Disposal of M&C subsidiary	(0.5)							(0.5)		(0.2)
Adjustments to redemption value of redeemable noncontrolling interest										(0.6)
Redeemable Non-Controlling Interest, ending balance at Dec. 31, 2018										7.9
Total Equity
Net income (loss)	(38.5)					(36.4)		(2.1)
Other comprehensive income (loss), net of tax	3.1			3.1
Dividend on common stock	(50)					(50)
Disposal of M&C subsidiary and Distributions to noncontrolling interest	0							0		(0.3)
Adjustments to redemption value of redeemable noncontrolling interest (Note 2)	1.4		$ 1.4
Share-based compensation	5.4		$ 5.4
Shares issued or repurchased, net (in shares)			0.3
Shares issued or repurchased, net	(1)		$ (0.1)			(0.9)
Ending balance at Dec. 31, 2019	1,128.7	$ (4.1)	$ 1,800.1	(48.8)	$ 0	(626.2)	$ (4)	3.6	$ (0.1)
Ending balance (in shares) at Dec. 31, 2019			72.3
Redeemable Non-Controlling Interest
Net income (loss)	0									0.1
Disposal of M&C subsidiary	0							0		(0.3)
Adjustments to redemption value of redeemable noncontrolling interest										(1.4)
Redeemable Non-Controlling Interest, ending balance at Dec. 31, 2019	$ 6.3									6.3
Redeemable Non-Controlling Interest
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Net income (loss)	$ 5					5.6		(0.6)
Other comprehensive income (loss), net of tax	(11.2)			(11.2)
Dividend on common stock	(24.7)					(24.7)
Disposal of M&C subsidiary and Distributions to noncontrolling interest	(2.9)							(2.9)		0
Adjustments to redemption value of redeemable noncontrolling interest (Note 2)	0		$ 0
Share-based compensation	5.8		$ 5.8
Shares issued or repurchased, net (in shares)			0.1
Shares issued or repurchased, net	(0.5)		$ (0.4)			(0.1)
Ending balance at Dec. 31, 2020	1,096.1		$ 1,805.5	$ (60)		$ (649.4)		0
Ending balance (in shares) at Dec. 31, 2020			72.4
Redeemable Non-Controlling Interest
Net income (loss)	0									0.2
Disposal of M&C subsidiary	(2.9)							$ (2.9)		0
Adjustments to redemption value of redeemable noncontrolling interest										0
Redeemable Non-Controlling Interest, ending balance at Dec. 31, 2020	$ 6.5									$ 6.5

Consolidated Statements of Eq_2

Consolidated Statements of Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Stockholders' Equity [Abstract]
Dividends declared (in dollars per share)	$ 0.34	$ 0.69	$ 11.65

Background and Basis of Present

Background and Basis of Presentation	12 Months Ended
	Dec. 31, 2020
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 real estate investment trust ("REIT") headquartered in Honolulu, Hawai‘i. The Company operates in three segments: Commercial Real Estate; Land Operations; and Materials & Construction. A description of each of the Company's reporting segments is as follows: • Commercial Real Estate ("CRE") - This segment functions as a vertically integrated real estate investment company with core competencies in investments and acquisitions (i.e., identifying opportunities and acquiring properties); construction and development (i.e., designing and ground-up development of new properties or repositioning and redevelopment of existing properties); and in-house leasing and property management (i.e., executing new and renegotiating renewal lease arrangements, managing its properties' day-to-day operations and maintaining positive tenant relationships). The Company's preferred asset classes include improved properties in retail and industrial spaces and also urban ground leases. Its focus within improved retail properties, in particular, is on grocery-anchored neighborhood shopping centers that meet the daily needs of Hawai‘i citizens. Through its core competencies and with its experience and relationships in Hawai‘i, the Company seeks to create special places that enhance the lives of Hawai‘i residents and to provide venues and opportunities that enable its tenants to thrive. Income from this segment is principally generated by owning, operating and leasing real estate assets. • Land Operations - This segment includes the Company's legacy assets and landholdings that are subject to the Company's simplification and monetization effort. Financial results from this segment are principally derived from real estate development and land sales, income/loss from real estate joint ventures, hydroelectric energy and other legacy business activities. • Materials & Construction ("M&C") - This segment operates as Hawai‘i's largest asphalt paving contractor and is one of the state's largest natural materials and infrastructure construction companies. Such activities are primarily conducted through its wholly-owned subsidiary, Grace Pacific LLC ("Grace Pacific"), a materials and construction company in Hawai‘i. Grace Pacific owns hot-mix asphalt plants throughout the state that support its internal paving operations and third-party customers. Grace Pacific also owns and operates a rock quarry and processing plant in Makakilo, Hawai‘i. In addition, Grace Pacific offers a variety of related for-sale and for-rent services including temporary and permanent roadway traffic control (GP Roadway Solutions, Inc. or "GPRS") and other related products and services. Grace Pacific also holds a 50% interest in an unconsolidated affiliate, Maui Paving, LLC ("Maui Paving"), which operates primarily on the island of Maui. Additional activity in the M&C segment includes its share of the results of operations of an unconsolidated investment, Pohaku Pa‘a LLC ("Pohaku"). Pohaku, through its wholly-owned subsidiaries, operates rock quarries on the islands of Oahu and Maui and sells a wide range of products that include ready-mix concrete, rock and sand aggregates and cultured stone and related products. As of December 31, 2020, the Company owns a portfolio of commercial real estate improved properties in Hawai‘i consisting of 22 retail centers, ten industrial assets and four office properties, representing a total of 3.9 million square feet of gross leasable area; it also owns a portfolio of ground leases in Hawai‘i representing 153.8 acres as of December 31, 2020. Basis of Presentation and Principles of Consolidation: The Company presents its financial statements in accordance with accounting principles generally accepted in the United States ("GAAP") as outlined in the Financial Accounting Standard Board ("FASB") Accounting Standards Codification (the "Codification" or "ASC"). The Codification is the single source of authoritative accounting principles applied by nongovernmental entities in the preparation of financial statements in conformity with GAAP. The consolidated financial statements include the accounts of the Company (including all wholly-owned subsidiaries), as well as all other entities in which the Company has a controlling financial interest. Intercompany transactions and balances have been eliminated in consolidation. Significant investments in businesses, partnerships and limited liability companies in which the Company does not have a controlling financial interest, but the Company has the ability to exercise significant influence, are accounted for using the equity method. A controlling financial interest in an entity may be established (i) through the Company holding a majority voting interest or (ii) if the Company is the primary beneficiary of an entity that qualifies as a variable interest entity ("VIE"), as defined in the Codification. The Company evaluates all partnerships, joint ventures and other arrangements with variable interests to determine if the entity or arrangement qualifies as a VIE. VIEs are entities where investors lack sufficient equity at risk for the entity to finance its activities without additional subordinated financial support or where equity investors, as a group, lack one of the following characteristics: (a) the power to direct the activities that most significantly impact the entity’s economic performance, (b) the obligation to absorb the expected losses of the entity, or (c) the right to receive the expected returns of the entity. If the entity or arrangement qualifies as a VIE and the Company is determined to be the primary beneficiary, the Company is required to consolidate the assets, liabilities, and results of operations of the VIE. The Company reevaluates whether an entity is a VIE as needed (i.e., when assessing reconsideration events that result in changes in the factors mentioned above) as part of determining if the consolidation or equity method treatment remains appropriate. As of December 31, 2020, the Company had an interest in various unconsolidated joint ventures that the Company accounts for using the equity method. Other than the obligations described in Note 12, obligations of the Company's joint ventures do not have recourse to the Company and the Company's maximum exposure is limited to its investment. The consolidated financial statements include the historical results of GP/RM Prestress, LLC ("GPRM"), a supplier of structural precast/prestressed concrete products, which was owned 51% by the Company, through the date of its disposal during the year ended December 31, 2020 (refer to Note 24). The consolidated financial statements also include the results of GLP Asphalt, LLC ("GLP Asphalt"), an importer and distributor of liquid asphalt, which is owned 70% by the Company. These entities were consolidated because the Company held a controlling financial interest through its majority voting interest in the entities. The remaining interest in these entities is reported as Noncontrolling interest and Redeemable Noncontrolling Interest in the consolidated financial statements. Profits, losses and cash distributions are allocated in accordance with the respective operating agreements. Use of Estimates: The preparation of the consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported. Estimates and assumptions are used for, but not limited to: (i) asset impairments, including intangible assets and goodwill, (ii) litigation and contingencies, (iii) revenue recognition for long-term real estate developments and construction contracts, (iv) pension and postretirement estimates, and (v) income taxes. Future results could be materially affected if actual results differ from these estimates and assumptions. Customer Concentration: A significant portion of Materials & Construction revenue and accounts receivable is generated directly and indirectly from projects administered by the City and County of Honolulu and from the State of Hawai‘i. Reductions in funding of infrastructure projects by these government agencies could reduce revenue and profits from the M&C segment. Further, although the customer mix of real estate sales in our Land Operations segment may be diverse in any given period, during the years ended December 31, 2018 and December 31, 2019, the Land Operations segment recognized gross profits of $162.2 million and $6.7 million, respectively, in connection with the sale of approximately 41,000 acres of Maui agricultural land and 100% of the Company's ownership interest in Central Maui Feedstocks LLC and Kulolio Ranch LLC (collectively referred to as the "Agricultural Land Sale"). Rounding: Amounts in the 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. Reclassifications: Certain amounts presented in the prior year have been reclassified to conform to the current year presentation (e.g., captions previously presented in the prior years that, in the currently presented periods, are less than five percent of total assets or total liabilities were combined in the current year consolidated balance sheets). Also refer to Note 2 to the consolidated financial statements for such reclassifications made in conjunction with the adoption of recent accounting pronouncements. Further, a reclassification was made to the consolidated statements of cash flows to present, on a net basis, amounts previously presented separately within cash flows from operating activities (i.e., to present activity related to proceeds and expenditures of real estate development/other property for sale – normal operating activity in the Company's Land Operations segment – on a net basis similar to the presentation of changes in other inventories held by the Company). This change does not affect previously reported cash flows from operating activities in the consolidated statements of cash flows.

Significant Accounting Policies

Significant Accounting Policies	12 Months Ended
	Dec. 31, 2020
Accounting Policies [Abstract]
Significant Accounting Policies	Significant Accounting Policies Real estate property, net: Real estate property, net primarily represents long-lived physical assets associated with the CRE segment's leasing activity (e.g., improved property leases and ground leases); it also includes landholdings and related assets in the Land Operations segment that the Company holds for either possible future development or future monetization as part of its simplification strategy. The balance primarily consists of land, buildings and improvements and is recorded at cost, net of accumulated depreciation. Expenditures for additions, improvements and other enhancements to real estate properties are capitalized, and minor replacements, maintenance and repairs that do not improve or extend asset lives are charged to expense as incurred. When assets related to real estate properties are retired or otherwise disposed of, the related cost and accumulated depreciation is removed from the accounts and any resulting gain or loss is included in results of operations for the respective period. Certain costs are capitalized related to the development and redevelopment of real estate properties, including pre-construction costs; real estate taxes; insurance; construction costs; and salaries and related costs of personnel directly involved. Additionally, the Company makes estimates as to the probability of certain development and redevelopment projects being completed. If the Company determines the development or redevelopment is no longer probable of completion, the Company expenses all capitalized costs which are not recoverable. Acquisitions of real estate properties: Acquisitions of real estate properties are evaluated to determine if they should be accounted for as asset acquisitions or business combinations (under current guidance, acquisitions of real estate properties are generally considered asset acquisitions). Under asset acquisition accounting, the Company estimates the fair value of acquired tangible assets (e.g., land, buildings and tenant improvements), identifiable intangible assets (e.g., in-place leases and favorable leases) and liabilities (e.g., unfavorable leases and assumed debt) based on an evaluation of available information at the date of the acquisition. Based on these estimates, the purchase consideration is allocated to the acquired assets and assumed liabilities. Transaction costs incurred during the acquisition process are capitalized as a component of the purchase consideration. In estimating the fair value of the tangible and intangible assets acquired and liabilities assumed, the Company considers information obtained about each property as a result of its due diligence and marketing and leasing activities and uses various valuation methods, such as estimated cash flow projections using appropriate discount and capitalization rates, analysis of recent comparable sales transactions, estimates of replacement costs net of depreciation and other available market information. The fair value of the tangible assets of an acquired property considers the value of the property as if it were vacant. Values for favorable leases acquired and unfavorable leases assumed are estimated based on the present value (using a discount rate reflecting the risks associated with leases acquired) of the difference between: (i) the contractual amounts to be paid pursuant to the leases negotiated and in-place at the time of acquisition and (ii) management’s estimate of fair market lease rates for the property or an equivalent property, measured over a period equal to the remaining term of the lease for favorable leases and the initial term plus the estimated term of any below-market, fixed-rate renewal options for unfavorable leases. The assets recognized and liabilities assumed are amortized over the related lease term plus fixed-rate renewal options, as appropriate. The purchase price is further allocated to in-place lease values and tenant relationship values based on management's evaluation of the specific characteristics of the acquired lease portfolio and the Company's overall relationship with the anchor tenants. Such amounts are amortized to expense over the remaining initial lease term (and expected renewal periods for tenant relationships). Real estate developments: Real estate developments represent certain costs capitalized and presented in the Land Operations segment that relate to (i) active real estate development projects and other land intended for sale or (ii) potential future real estate development projects intended for lease that would be part of future CRE segment operations. For potential future real estate development projects intended for lease, when management with the relevant authority has approved expenditures for activities clearly associated with the development and construction of a CRE segment project (generally after all required government agency approvals have been obtained), the capitalized costs associated with such project (e.g., historical cost of land) will be included in Real estate property, net in the accompanying consolidated balance sheets. Certain costs capitalized relating to active real estate development projects intended for sale may include pre-construction costs (e.g., costs related to land acquisition); construction costs (e.g., grading, roads, water and sewage systems, landscaping and project amenities); direct overhead costs (e.g., utilities, maintenance, insurance and real estate taxes); capitalized interest; and salaries and related costs of personnel directly involved. For development projects, capitalized costs are allocated using the direct method for expenditures that are specifically associated with the unit being sold and the relative-sales-value method for expenditures that benefit the entire project. Direct overhead costs incurred after the development project is substantially complete and ready to be marketed are charged to selling, general and administrative expense as incurred. All indirect overhead costs are charged to selling, general and administrative costs as incurred. Cash flows related to active real estate development projects and other land intended for sale are classified as operating activities in the consolidated statements of cash flows. Capitalized Interest: Interest costs on developments and major redevelopments are capitalized as part of real estate development and redevelopment projects that have not yet been placed into service. Capitalization of interest commences when development activities and expenditures begin and end when the asset is substantially complete and ready for its intended use or ready to be marketed. Other property, net: Other property, net represents all other long-lived physical assets other than those presented in Real estate property, net and Real estate developments. The balance primarily consists of long-lived assets in the M&C segment, but also contains corporate long-lived physical assets and Land Operations long-lived physical assets that are used in other Land Operations activities and are not included in Real estate property, net or Real estate developments in the accompanying consolidated balance sheets. Other property, net is stated at cost, net of accumulated depreciation. Expenditures for major renewals and betterments are capitalized. Replacements, maintenance and repairs that do not improve or extend asset lives are expensed as incurred. Depreciation: Depreciation and amortization is computed using the straight-line method over the estimated useful lives of the assets or the units-of-production method for quarry production-related assets. Estimated useful lives of property are as follows: Classification Range of Life (in years) Building and improvements 10 to 40 Leasehold improvements 5 to 10 (lesser of useful life or lease term) Water, power and sewer systems 5 to 50 Asphalt plants, machinery and equipment 2 to 35 Other property improvements 3 to 35 Intangible Assets: Real estate intangible assets are included in Real estate intangible assets, net in the accompanying consolidated balance sheets and are generally related to the acquisition of commercial real estate properties. In the event a lease or leases with a tenant have been, or are expected to be, terminated early, the Company evaluates the remaining useful lives of depreciable or amortizable assets of the associated assets related to the lease terminated (i.e., tenant improvements, above and below market lease intangibles, in-place lease value and leasing commissions). Based upon consideration of the facts and circumstances surrounding the termination, the Company may accelerate the depreciation and amortization of such associated assets. Other intangible assets are included in Prepaid expenses and other assets in the accompanying consolidated balance sheets and are generally related to historical acquisitions from the Materials & Construction segment or software capitalized for internal use. Cash and Cash Equivalents: Cash equivalents consist of highly liquid investments with a maturity of three months or less at the date of purchase. The Company carries these investments at cost, which approximates fair value. Restricted Cash: The Company's historical restricted cash balances have been primarily composed of proceeds from potential §1031 of the Internal Revenue Code of 1986, as amended (the "Code") tax-deferred sales held in escrow pending future use in acquisitions of replacement real estate assets (if within the required time period). There were no material amounts of available proceeds from potential Code §1031 tax-deferred sales in the balance as of December 31, 2020 or December 31, 2019. Allowance for Credit Losses : The Company estimates its allowance for credit losses for financial assets within the scope of ASC Topic 326, Financial Instruments - Credit Losses ("ASC 326"), at portfolio levels which include the CRE segment, the Land Operations segment and individual components of the M&C segment. Within these portfolio levels, the Company develops expected credit loss estimates by security type (which may include financing receivables or contract assets recognized in contracts with customers) by factoring historical loss information; information on both current conditions and reasonable and supportable forecasts of future conditions that may not be reflected in historical loss information; and other relevant credit quality information for the respective securities. As part of this process, the Company analyzes relevant information on a collective (pool) basis for securities with similar risk characteristics or separately on an individual basis when a financial asset does not share risk characteristics with other financial assets. The portfolios of financial assets within the scope of ASC 326 relating to the CRE and Land Operations segments include financing receivables (i.e., notes receivable), which are primarily composed of historical development and other land- related transactions. The assets in these portfolios are analyzed on an individual basis, in which the Company considers certain, available information specific to the counterparties to the transactions (e.g., liquidity and solvency of the counterparties) and environmental factors that are relevant in the assessment of the expected collectability of the future cash flows for these assets (e.g., changes and expected changes in the general economic environment in which the counterparty operates). For these assets, the Company uses a discounted cash flow method to calculate the allowance for credit losses using the asset's effective interest rate. The portfolios relating to the M&C segment represent discrete business components and are composed of contract assets from the Company's contracts with customers. The differing nature of the products and services provided by these components drive differences in historical and expected credit loss patterns and, as such, the Company tracks historical loss information at this portfolio level as part of information it uses to develop its estimate of expected credit losses. Further, as the Company believes its contract assets have different default risk expectations based on customer/project type, in addition to the historical loss information at the portfolio level, the Company also pools the respective portfolio's contract receivables by these different categories to make adjustments to its historical loss experience. Other information the Company analyzes and uses in its development of its allowance for credit losses include known customer information and environmental factors surrounding the customers' current and future ability to pay (i.e., changes and expected changes in the general economic environment in which the customers operate). Allowance for Doubtful Accounts: Allowances for doubtful accounts are established by management based on estimates of collectability. Estimates of collectability are principally based on an evaluation of the current financial condition of the Company’s customers and their payment history, which are regularly monitored by the Company. Other receivables, net : Other receivables, net are primarily composed of notes receivable recorded at cost less allowances for credit losses on the consolidated balance sheets. Goodwill: The Company reviews goodwill for impairment at the reporting unit level annually or between annual tests if an event occurs or circumstances change that would more likely than not reduce the fair value of the reporting unit below its carrying amount. If the results of the Company's test indicates that a reporting unit's estimated fair value is less than its carrying value, an impairment charge is recognized for the amount by which the carrying amount exceeds the reporting unit's fair value, not to exceed the total amount of goodwill allocated to that reporting unit. Refer to Note 8 for additional detail. Self-Insured Liabilities: The Company is self-insured for certain losses that include, but are not limited to, employee health, workers’ compensation, general liability, real and personal property, and real estate construction warranty and defect claims. When feasible, the Company obtains third-party insurance coverage to limit its exposure to these claims. When estimating its self-insured liabilities, the Company considers a number of factors, including historical claims experience, demographic factors, and valuations provided by independent third-parties. Redeemable Noncontrolling Interest: As noted above, the Company has a 70% ownership interest in GLP Asphalt through its ownership of Grace Pacific. The noncontrolling interest in GLP Asphalt may be redeemed for cash at the option of the noncontrolling interest holder at a redemption value, which is derived from a specified formula based on the GLP Asphalt operating agreement (i.e., other than fair value). Non-controlling interests in subsidiaries that are redeemable for cash or other assets outside of the Company’s control at other than fair value are classified as mezzanine equity, outside of equity and liabilities. Such amounts are adjusted at each reporting date to the higher of (1) the amount resulting from the initial carrying amount, increased or decreased for cumulative amounts of the noncontrolling interest holder's share of net income or loss, share of other comprehensive income or loss and dividends and (2) the redemption value on each annual balance sheet date. The resulting changes in the carrying value, increases or decreases, are recorded with corresponding adjustments against earnings surplus or, in the absence of earnings surplus, common stock. When applicable, these adjustments are reflected in the computation of earnings per share using the two-class method. Fair Value Measurements: ASC Topic 820, Fair Value Measurements and Disclosures ("ASC 820"), as amended, establishes a fair value hierarchy, which requires the Company to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The hierarchy places the highest priority on unadjusted quoted market prices in active markets for identical assets or liabilities (Level 1 measurements) and assigns the lowest priority to unobservable inputs (Level 3 measurements). The three levels of inputs within the hierarchy are defined as follows: Level 1: Quoted prices (unadjusted) for identical assets or liabilities in active markets. Level 2: Significant other observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active, or other inputs that are observable or can be corroborated by observable market data. Level 3: Significant unobservable inputs that reflect the Company’s own assumptions about the assumptions that market participants would use in pricing an asset or liability. If the technique used to measure fair value includes inputs from multiple levels of the fair value hierarchy, the lowest level of significant input determines the placement of the entire fair value measurement in the hierarchy. Revenue Recognition and Leases - The Company as a Lessor: Sources of revenue for the Company primarily include commercial property rentals, sales of real estate, real estate development projects, material sales and paving construction projects. The Company generates revenue from its three distinct business segments: Commercial Real Estate: The Commercial Real Estate segment owns, operates, leases, and manages a portfolio of retail, office, and industrial properties in Hawai‘i; it also leases urban land in Hawai‘i to third-party lessees. Commercial Real Estate revenue is recognized under lease accounting guidance with the Company as lessor. Leases - The Company as Lessor: The Company reviews its contracts to determine if they qualify as a lease. A contract is determined to be a lease when the right to substantially all of the economic benefits and to direct the use of an identified asset is transferred to a customer over a defined period of time for consideration. During this review, the Company evaluates among other items, asset specification, substitution rights, purchase options, operating rights and control over the asset during the contract period. The Company has lease agreements with lease and non-lease components, which are generally accounted for separately under ASC Topic 606, Revenue from Contracts with Customers . The Company has elected the practical expedient to not separate non-lease components from lease components for all classes of underlying assets where the component follows the same timing and pattern as the lease component and the lease component is classified as an operating lease. Non-lease components included in rental revenue primarily consist of tenant reimbursements for common area maintenance and other services paid for by the lessor and utilized by the lessee. Under the practical expedient, the Company accounts for the single, combined component under leasing guidance as the lease component is the predominant component in the contract. Rental revenue is primarily derived from operating leases and, therefore, is generally recognized on a straight-line basis over the term of the lease. Fixed contractual payments from the Company's leases are recognized on a straight-line basis over the terms of the respective leases. Straight-line rental revenue commences when the customer assumes control of the leased premises. The accrued straight-line receivable represents the amount by which straight-line rental revenue exceeds rents currently billed in accordance with lease agreements. Certain of the Company's lease agreements include terms for contingent rental revenue (e.g., percentage rents based on tenant sales volume) and tenant reimbursed property taxes, which are both accounted for as variable payments. Certain of the Company's leases include termination and/or extension options. Termination options allow the customer to terminate the lease prior to the end of the lease term under specific circumstances. The Company's extension options generally require a re-negotiation with the customer at market rates. Initial direct costs, primarily commissions, related to the leasing of properties are capitalized on the balance sheet and amortized over the lease term. All other costs to negotiate or arrange a lease are expensed as incurred. Accounts receivable related to leases are regularly evaluated for collectability, considering factors including, but not limited to, the credit quality of the customer, historical trends of the customer, and changes in customer payment terms. Upon determination that the collectability of a customer receivable is not probable, the Company will reverse the receivable and record a corresponding reduction of revenue previously recognized. Subsequent revenue is recorded on a cash basis until collectability on related billings becomes probable. Upon determination that portions of a tenant's receivables are not probable of collection (e.g., due to current conditions impacting specific amounts), the Company will record an allowance for doubtful accounts for the recorded operating lease receivable and record a corresponding adjustment of revenue previously recognized. In April 2020, the FASB staff issued a question-and-answer document focusing on lease concessions related to the effects of the 2019 coronavirus ("COVID-19") and the application of lease accounting guidance related to modifications (the "Lease Modification Q&A"). See Note 14 for further discussion on the impact of applicable rent relief provided beginning in the quarter ended June 30, 2020 under the Lease Modification Q&A. Land Operations: Revenues from sales of real estate are recognized at the point in time when control of the underlying goods is transferred to the customer and the payment is due (generally on the closing date). For certain development projects, the Company will use a percentage of completion for revenue recognition. Under this method, the amount of revenue recognized is based on the development costs that have been incurred throughout the reporting period as a percentage of total expected developments associated with the development project. Materials & Construction: Revenue from the Materials & Construction segment is primarily generated from material sales and paving and construction contracts. The recognition of revenue is based on the underlying terms of the transactions. Materials: Revenues from material sales, which include basalt aggregate, liquid asphalt and hot mix asphalt, are usually recognized at a point in time when control of the underlying goods is transferred to the customers (generally this occurs when materials are picked up by customers or their agents) and when the Company has a present right to payment for materials sold. Construction: The Company's construction contracts generally contain a single performance obligation as the promise to transfer individual goods or services are not separately identifiable from other promises in the contracts and is, therefore, not distinct. Revenue is earned from construction contracts over a period of time as control is continuously transferred to customers. Construction contracts can generally be categorized into two types of contracts with customers based on the respective payment terms; either lump sum or unit priced. Lump sum contracts require the total amount of work be performed under a single fixed price irrespective of actual quantities or actual costs. Earnings on both unit price contracts and lump sum fixed-price paving contracts are recognized using the percentage of completion, cost-to-cost, input method, as it is able to faithfully depict the transfer of control of the underlying assets to the customer. Related to its long-term construction contracts, due to the nature of the work required to be performed, estimating total revenue and cost at completion of the contract is complex, subject to many variables and requires significant judgment. Such estimates of contract revenue and cost are dependent on a number of factors that may change during a contract performance period, resulting in changes to estimated contract profitability. These factors include, but are not limited to, the completeness and accuracy of the original bid; changes in the timing of scheduled work; change orders; unusual weather conditions; changes in costs of labor and/or materials; changes in productivity expectations; and the expected, or actual, resolution terms for claims. Management evaluates changes in estimates on a contract by contract basis and uses the cumulative catch-up method to account for the changes in the period in which they are determined. Certain construction contracts include retainage provisions. The balances billed but not paid by customers pursuant to these provisions generally become due upon completion and acceptance of the project work or products by the owners. The Company deems its contract prices reflective of the standalone selling prices of the underlying goods and services since the contracts are required to go through a competitive bidding process. On a consolidated basis, in addition to disclosing amounts recorded as contract assets or contract liabilities in its consolidated balance sheets, the Company discloses information about the amount of contract consideration allocated to either wholly unsatisfied or partially satisfied performance obligations (see Note 13). Related to this disclosure, the Company has elected to not disclose information about the amount of contract consideration allocated to remaining performance obligations for certain contracts that have original expected durations of one year or less. This may occur with contracts for sales of real estate that are executed as of the end of the period with control of the underlying assets to be transferred to the customer subsequent to the end of the period. The closing date of such transactions will generally occur within one year or less of the contract execution date. Leases - The Company as Lessee: The Company determines if an arrangement is a lease at inception by considering whether that arrangement conveys the right to use an identified asset for a period of time in exchange for consideration. Operating leases are included in Operating lease right-of-use assets ("ROU assets") and Operating lease liabilities in the Company's consolidated balance sheets. ROU assets and lease liabilities related to finance leases are included in Other property, net and Notes payable and other debt, respectively, in the Company's consolidated balance sheets. ROU assets represent the Company's right to use an underlying asset for the lease term and lease liabilities represent the obligation to make lease payments arising from the lease. ROU assets and lease liabilities are recognized at commencement date based on the present value of lease payments over the lease term. As most of the Company's leases do not provide an implicit rate and are not readily determinable, the Company uses its incremental borrowing rate based on the estimated rate of interest for collateralized borrowing over a similar term of the lease payments at commencement date. ROU assets also include any lease payments made at or before the commencement date and excludes any lease incentives received. Lease terms may include options to extend or terminate the lease when it is reasonably certain that the Company will exercise that option. Operating lease expense for lease payments is recognized on a straight-line basis over the lease term. In connection with its application of the lease guidance, the Company has evaluated the lease and non-lease components within its leases where it is the lessee and has elected, for all classes of underling assets, the practical expedient to present lease and non-lease components in its lease agreements as one component. The Company has also elected, for all classes of underlying assets, to not recognize lease liabilities and lease assets for leases with a term of 12 months or less. Impairment of Long-Lived Assets Held and Used and Finite-Lived Intangible Assets: Long-lived assets held and used, including finite-lived intangible assets, are reviewed for possible impairment when events or circumstances indicate that the carrying value may not be recoverable. In such an evaluation, the estimated future undiscounted cash flows generated by the asset are compared with the amount recorded for the asset to determine if its carrying value is not recoverable. If this review determines that the recorded value will not be recovered, the amount recorded for the asset is reduced to estimated fair value. Refer to Note 24 for further discussion. Impairment of Investments in Affiliates: The Company's investments in affiliates that are accounted for under the equity method are reviewed for impairment whenever there is evidence that fair value may be below carrying cost. An investment is written down to fair value if fair value is below carrying cost and the impairment is believed to be other-than-temporary. Refer to Note 5 for further discussion. Share-Based Compensation: The Company records compensation expense for all share-based payment awards made to employees and directors. The Company’s various equity plans are more fully described in Note 16. Employee Benefit Plans: The Company provides a wide range of benefits to existing employees and retired employees, including single-employer defined benefit plans, postretirement, defined contribution plans, post-employment and health care benefits. The Company records amounts relating to these plans based on various actuarial assumptions, including discount rates, assumed rates of return, compensation increases, turnover rates and health care cost rate trends. The Company reviews its actuarial assumptions on an annual basis and makes modifications to the assumptions based on current economic conditions and trends. The Company believes that the assumptions utilized in recording obligations under the Company’s plans, which are presented in Note 17, are reasonable based on its experience and on advice from its independent actuaries; however, differences in actual experience or changes in the assumptions may materially affect the Company’s financial position or results of operations. Interest and other income (expense), net for the years ended December 31, 2020, 2019 and 2018 included the following (in millions): 2020 2019 2018 Pension and postretirement benefit (expense) $ (2.6) $ (3.1) $ (3.0) Interest income 1.7 3.0 1.5 Gain (loss) on sale of joint venture interest — 2.6 4.2 Reductions in solar investments, net — (0.1) (0.5) Other income (expense) 1.2 0.8 0.1 Interest and other income (expense), net $ 0.3 $ 3.2 $ 2.3 Income Taxes: The Company makes certain estimates and judgments in determining income tax expense for financial statement purposes. These estimates and judgments are applied in the calculation of tax credits, tax benefits and deductions, and in the calculation of certain deferred tax assets and liabilities, which arise from differences in the timing of recognition of revenue and expense for tax and financial statement purposes. Deferred tax assets and deferred tax liabilities are adjusted to the extent necessary to reflect tax rates expected to be in effect when the temporary differences reverse. Adjustments may be required to deferred tax assets and deferred tax liabilities due to changes in tax laws and audit adjustments by tax authorities. To the extent adjustments are required in any given period, the adjustments would be included within the tax provision in the accompanying consolidated statements of operations. Discontinued Operations: In December 2016, the Company completed its final sugar harvest and ceased its sugar operations. Costs related to the cessation of sugar operations are presented as discontinued operations in the consolidated statements of operations. Liabilities related to the cessation of sugar operations are presented within Accrued and other liabilities in the consolidated balance sheets. Earnings Per Share (“EPS”): Basic and diluted earnings per share are computed and disclosed in accordance with ASC Topic 260, Earnings Per Share . The Company utilizes the two-class method to compute earnings available to common shareholders. Under the two-class method, earnings are adjusted by accretion amounts to redeemable noncontrolling interests recorded at redemption value. The adjustments represent in-substance dividend distributions to the noncontrolling interest holder as the holder has a contractual right to receive

Real Estate Property, Net and O

Real Estate Property, Net and Other Property, Net	12 Months Ended
	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Real Estate Property, Net and Other Property, Net	Real Estate Property, Net and Other Property, Net Real estate property, net as of December 31, 2020 and 2019 includes the following (in millions): 2020 2019 Land $ 769.6 $ 768.8 Buildings 696.0 692.4 Other property improvements 84.1 79.0 Subtotal 1,549.7 1,540.2 Accumulated depreciation (154.4) (127.5) Real estate property, net $ 1,395.3 $ 1,412.7 Other property, net, as of December 31, 2020 and 2019 was as follows (in millions): 2020 2019 Land $ 39.3 $ 38.4 Buildings 18.5 19.7 Asphalt plants, machinery and equipment 104.4 105.5 Water, power and sewer systems 19.7 30.6 Other property improvements 6.4 6.8 Subtotal 188.3 201.0 Accumulated depreciation (77.5) (76.6) Other property, net $ 110.8 $ 124.4 As noted in Note 2, the Company may capitalize a portion of interest costs incurred to long-lived assets for developments, major redevelopments and other projects that meet certain criteria. Total interest costs incurred were $30.6 million, $34.1 million, and $35.9 million in 2020, 2019 and 2018, respectively. Capitalized interest costs related to development activities were $0.3 million, $1.0 million and $0.6 million in 2020, 2019 and 2018, respectively. Depreciation expense for the years ended December 31, 2020, 2019 and 2018 was $38.8 million, $35.6 million and $32.5 million, respectively.

Acquisitions and Intangible Ass

Acquisitions and Intangible Assets, Net	12 Months Ended
	Dec. 31, 2020
Real Estate [Abstract]
Acquisitions and Intangible Assets, Net	Acquisitions and Intangible Assets, Net The Company did not execute any real estate asset acquisitions during the year ended December 31, 2020. Acquisitions in 2019 During the year ended December 31, 2019, the Company acquired five commercial real estate assets for $218.4 million that were accounted for as asset acquisitions. Such acquisitions were structured as like-kind exchanges in accordance with Code §1031, using cash proceeds from the Agricultural Land Sale. The allocation of purchase price to the aggregate assets acquired and liabilities assumed in connection with the five commercial real estate acquisitions in 2019 was as follows (in millions): Fair value of assets acquired and liabilities assumed Assets acquired: Land $ 106.9 Property and improvements 91.3 In-place leases 23.2 Favorable leases 4.3 Total assets acquired $ 225.7 Liabilities assumed: Unfavorable leases $ 7.3 Total liabilities assumed $ 7.3 Net assets acquired $ 218.4 As of the acquisition date, the weighted-average amortization periods of the in-place and favorable leases were approximately 8.2 years and 4.7 years, respectively. The weighted-average amortization period of the unfavorable leases was approximately 18.6 years. Acquisitions in 2018 During the year ended December 31, 2018, the Company acquired five commercial real estate assets for an aggregate purchase price of $303.7 million that were accounted for as asset acquisitions. The acquisitions were largely funded through cash using §1031 proceeds from the sale of the Company's last seven mainland properties and also from the Agricultural Land Sale. The aggregate purchase price also included a mortgage loan with a contractual principal amount of $62.0 million that is secured by one of the properties and $2.7 million of capitalized and acquisition-related costs paid to third parties. The allocation of purchase price to assets acquired and liabilities assumed were as follows (in millions): Fair value of assets acquired and liabilities assumed Assets acquired: Land $ 92.8 Property and improvements 173.9 In-place leases 32.0 Favorable leases 6.7 Total assets acquired $ 305.4 Liabilities assumed: Unfavorable leases $ 2.7 Notes payable and other debt 1 61.0 Total liabilities assumed $ 63.7 Net assets acquired $ 241.7 1 Includes a fair value adjustment of $1.0 million. As of the acquisition date, the weighted-average amortization periods of the in-place and favorable leases were approximately 12.4 years and 11.7 years, respectively. The weighted-average amortization period of the unfavorable leases was approximately 11.5 years. Intangible assets, net Real estate intangible assets, net and other intangible assets included in Prepaid expenses and other assets as of December 31, 2020 and 2019 were as follows (in millions): 2020 2019 In-place leases $ 125.0 $ 125.2 Favorable leases 29.0 29.0 Accumulated amortization of in-place leases (73.8) (63.4) Accumulated amortization of favorable leases (18.3) (15.9) Real estate intangible assets, net $ 61.9 $ 74.9 Other intangible assets $ 20.4 $ 20.2 Accumulated amortization of other intangible assets (10.2) (7.9) Other intangible assets, net $ 10.2 $ 12.3 Total intangible asset amortization expense was $14.5 million, $12.5 million, and $8.7 million for 2020, 2019 and 2018, respectively. Estimated amortization expenses related to intangible assets over the next five years are as follows (in millions): Estimated 2021 $ 11.5 2022 9.1 2023 8.1 2024 5.8 2025 5.4

Investments in Affiliates

Investments in Affiliates	12 Months Ended
	Dec. 31, 2020
Equity Method Investments and Joint Ventures [Abstract]
Investments in Affiliates	Investments in Affiliates The Company's investments in affiliates consist principally of equity investments in limited liability companies in which the Company has the ability to exercise significant influence over the operating and financial policies of these investments. Accordingly, the Company accounts for its investments using the equity method of accounting. Operating results presented in the Company's consolidated statements of operations include the Company's proportionate share of net income (loss) from its equity method investments. The Company’s carrying value of investments in affiliates totaled $169.6 million and $167.6 million as of December 31, 2020 and 2019, respectively. The amounts of the Company’s investment as of December 31, 2020 and 2019 that represent undistributed earnings of investments in affiliates were approximately $10.6 million and $9.2 million, respectively. Dividends and distributions from unconsolidated affiliates totaled $6.1 million in 2020, $12.4 million in 2019 and $51.1 million in 2018. A summary of combined assets and liabilities reported by such entities accounted for by the equity method as of December 31, 2020 and 2019 were as follows (in millions): 2020 2019 Current assets $ 73.0 $ 79.3 Non-current assets 688.0 697.9 Total assets $ 761.0 $ 777.2 Current liabilities $ 33.5 $ 27.1 Non-current liabilities 96.7 109.0 Total liabilities $ 130.2 $ 136.1 A summary of combined operating results reported by such entities accounted for by the equity method for each of the years ended December 31, 2020, 2019 and 2018 were as follows (in millions): 2020 2019 2018 Revenues $ 174.2 $ 191.9 $ 243.6 Operating costs and expenses 147.1 173.0 209.7 Gross profit (loss) $ 27.1 $ 18.9 $ 33.9 Income (loss) from Continuing Operations* $ 12.1 $ 6.6 $ 17.4 Net Income (loss)* $ 11.6 $ 6.6 $ 16.5 * Includes earnings from equity method investments held by the investee. The carrying value of the Company's investment in Kukui‘ula, which includes capital contributed by the Company to the joint venture and the value of land initially contributed, net of joint venture earnings and losses and impairments, was $118.7 million and $116.2 million as of December 31, 2020 and 2019, respectively. The total capital contributed to the joint venture by the Company as a percent of total committed was approximately 62% as of December 31, 2020. The Company does not have a controlling financial interest in the joint venture, but exercises significant influence over the operating and financial policies of the venture and, therefore, accounts for its investment using the equity method. Due to the complex nature of cash distributions to the members, net income of the joint venture is allocated to the members, including the Company, using the Hypothetical Liquidation at Book Value (“HLBV”) method. Under the HLBV method, joint venture income or loss is allocated to the members based on the period change in each member’s claim on the book value of net assets of the venture, excluding capital contributions and distributions made during the period. The Company also has investments in various other joint ventures that operate or develop real estate and joint ventures that engage in materials and construction-related activities and renewable energy. The Company does not have a controlling financial interest, but has the ability to exercise significant influence over the operating and financial policies of these joint ventures and, accordingly, accounts for its investments in these ventures using the equity method of accounting. Impairment of Investments in Affiliates: When there is evidence that the fair value of the Company's investments in affiliates that are accounted for under the equity method may be below the carrying value, the Company must determine if such decline in value is other-than-temporary. In evaluating the fair value of an investment and whether any identified impairment is other-than-temporary, significant estimates and considerable judgments are involved. These estimates and judgments are based, in part, on the Company’s current and future evaluation of economic conditions in general, as well as a joint venture’s current and future plans. Additionally, these impairment calculations are highly subjective because they require management to make assumptions and apply judgments to estimates regarding the timing and amount of future cash flows that may consider various factors, including sales prices, development costs, market conditions and absorption rates, probabilities related to various cash flow scenarios, and appropriate discount rates based on the perceived risks, among others. In evaluating whether an impairment is other-than-temporary, the Company considers all available information, including the length of time and extent of the impairment, the financial condition and near-term prospects of the affiliate, the Company’s ability and intent to hold the investment for a period of time sufficient to allow for any anticipated recovery in market value, and projected industry and economic trends, among others. Changes in these and other assumptions could affect the projected operational results and fair value of the unconsolidated affiliates, and accordingly, may require valuation adjustments to the Company’s investments that may materially impact the Company’s financial condition or its future operating results. Weakness in particular real estate markets, difficulty in obtaining or renewing project-level financing or development approvals, and changes in the Company’s development strategy, among other factors, may affect the value or feasibility of certain development projects owned by the Company or by its joint ventures and could lead to additional impairment charges in the future. In the year ended December 31, 2020, the Company did not recognize any impairments of investments in affiliates. During the fourth quarter of 2018, the Company recorded impairments of investments in affiliates of $188.6 million. This amount was primarily driven by an impairment in its investment in Kukui‘ula. In 2018, the Company determined that its investment in Kukui‘ula was other-than-temporarily impaired as a result of changing its strategy and no longer intending to hold its investment through the duration of the project. As a result, the Company estimated the fair value of its investment in Kukui‘ula (using a discounted cash flow model) to be below its carrying value and recorded the non-cash, other-than-temporary impairment. The Company classified the fair value measurement as Level 3. The weighted average discount rate used in the valuation was 18.0%.

Allowance and Other Reserves

Allowance and Other Reserves	12 Months Ended
	Dec. 31, 2020
Credit Loss [Abstract]
Allowance and Other Reserves	Allowances and Other Reserves The Company reduces recorded amounts for accounts receivable and other financial assets by various allowances and reserve accounts. Effective January 1, 2020, the Company adopted ASC 326 and certain amounts previously recorded in the allowance for doubtful accounts or in other allowances for financing receivables were reclassified to an allowance for credits losses. Also, effective January 1, 2019, the Company adopted guidance under the new lease standards ("ASC 842") and reclassified certain amounts previously in the allowance for doubtful accounts into a reserve for cash basis tenants (i.e., reserves on receivables for which the Company assessed that the tenant's future payment of amounts due under leases is not probable). The following table presents the balances and activity (including reclassifications) in the various allowance and reserve accounts related to the Company's accounts receivable and financial assets for the three years ended December 31, 2020, 2019 and 2018 (in millions): Balance at beginning of year Impact of adoption of ASC 326 1 Impact of adoption of ASC 326 2 Additions 3 Deductions or other 4 Balance at end of year Year ended December 31, 2020 Deducted from assets Reserve for cash basis tenants $ 0.9 $ — $ — $ 10.6 $ 1.2 $ 12.7 Allowance for doubtful accounts $ 0.6 (0.3) — 3.6 (1.3) $ 2.6 Reserve for contract credits $ 2.3 — — — — $ 2.3 Allowance for credit losses - financing receivables $ — 1.6 2.7 (0.4) — $ 3.9 Allowance for credit losses - contract assets $ — 0.3 1.4 (0.9) (0.1) $ 0.7 Loans allowance $ 1.6 (1.6) — — — $ — Other reserves $ 0.4 — — — (0.4) $ — Year ended December 31, 2019 Deducted from assets Reserve for cash basis tenants $ — — — — 0.9 $ 0.9 Allowance for doubtful accounts $ 2.0 — — (0.4) (1.0) $ 0.6 Reserve for contract credits $ — — — 2.3 — $ 2.3 Loans allowance $ 1.6 — — — — $ 1.6 Other reserves $ 0.4 — — — — $ 0.4 Year ended December 31, 2018 Deducted from assets Allowance for doubtful accounts $ 1.4 — — 1.3 (0.7) $ 2.0 Loans allowance $ 1.6 — — — — $ 1.6 Other reserves $ 0.4 $ — $ — $ — $ — $ 0.4 1 Reclassifications from other reserves or allowances that fall into the scope of ASC 326. 2 Impact of adoption of ASC 326 recorded against total equity. 3 Net provisions charged against income. 4 Write offs or other activity (e.g., reclassifications for movement of allowances to cash basis reserves). During the year ended December 31, 2020, additional tenants were identified and designated as cash basis tenants and amounts for such tenants previously accounted for in the allowance for doubtful accounts were reclassified into the reserve for cash basis tenants. Refer to Note 14 for further discussion on current period charges related to the Company's assessment of collectability on amounts due under leases. Note that under ASC 842, such charges and reserve activity reflect a reversal of the revenue and receivable balance originally recorded. The allowance for credit losses for financing receivables relates to three assets that originated as part of transactions in the Land Operations segment. The credit quality of the Company's financing receivables is monitored each reporting period on an individual asset basis using specific information on the counterparties in these transactions. The first originated in 2008 and had an amortized cost basis of $1.6 million as of both the adoption date of January 1, 2020 and December 31, 2020. Based on individual credit quality indicators of the counterparty as of the adoption date and December 31, 2020, the most likely outcome of expected cash flows for the asset in a range of possible outcomes (i.e., the single best estimate) was zero and, as a result, the Company recorded a full allowance for credit losses for the financing receivable on adoption of ASC 326 as of January 1, 2020 and as of December 31, 2020. The second financing receivable within Land Operations was generated in 2016 and had an amortized cost basis of $13.5 million and $11.1 million as of the adoption date of January 1, 2020 and December 31, 2020, respectively. The third financing receivable within Land Operations was generated in 2017 and had an amortized cost basis of $2.6 million and $2.7 million as of the adoption date of January 1, 2020 and December 31, 2020, respectively. The second and third financing receivables were evaluated based on the credit quality indicators of the respective counterparties (as well as reasonable and supportable forecasts of future conditions that are relevant to determining the expected collectability of the receivable) as of the adoption date and December 31, 2020 and the estimated allowance for credit losses was calculated using a discounted cash flow approach. The allowance for credit losses for contract assets relates to trade receivables in the M&C segment that are due in one year or less and resulted from revenue transactions from contracts with customers. For allowance for credit losses estimated using the discounted cash flow approach, changes in present value attributable to the passage of time are reported as an adjustment to credit loss expense. As a result, the provision for expected credit losses in any given period may be impacted by changes in expected credit losses on future payments or current period collections for receivables on which allowances were recorded in previous periods, both of which may be further impacted or offset by changes in present value attributable to the passage of time.

Inventories

Inventories	12 Months Ended
	Dec. 31, 2020
Inventory Disclosure [Abstract]
Inventories	Inventories Inventories are stated at the lower of cost (principally average cost, first-in, first-out basis) or net realizable value. Inventories as of December 31, 2020 and 2019 were as follows (in millions): 2020 2019 Asphalt $ 4.2 $ 8.0 Processed rock and sand 7.9 6.6 Work in progress 3.2 2.9 Retail merchandise 2.1 2.0 Parts, materials and supplies inventories 1.0 1.2 Total $ 18.4 $ 20.7

Goodwill

Goodwill	12 Months Ended
	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	GoodwillThe Company's goodwill balance as of December 31, 2020 and 2019 was $10.5 million and $15.4 million, respectively. As of December 31, 2019, the goodwill balance was attributable to three reporting units in the M&C segment - GPC (primarily consisting of the Grace Pacific’s quarry, paving, and liquid asphalt operations), GPRS (primarily consisting of Grace Pacific’s roadway and maintenance solutions operations) and GPRM (primarily consisting of Grace Pacific’s prestressed and precast concrete operations) - and the CRE reporting unit, which is also a reportable segment. During the year ended December 31, 2020, the Company disposed of the GPRM reporting unit in its entirety and derecognized the associated goodwill. The changes in the carrying amount of goodwill (for each period a consolidated balance sheet is presented) allocated to the Company's reportable segments starting with the year ended December 31, 2019 and continuing to the year ended December 31, 2020 were as follows (in millions): Materials & Construction Commercial Real Estate Total Carrying amount of goodwill: Gross amount of goodwill $ 93.6 $ 8.7 $ 102.3 Accumulated impairment losses (37.2) — (37.2) Balance, January 1, 2019 $ 56.4 $ 8.7 $ 65.1 Impairment losses (49.7) — (49.7) Carrying amount of goodwill: Gross amount of goodwill 93.6 8.7 102.3 Accumulated impairment losses (86.9) — (86.9) Balance, December 31, 2019 $ 6.7 $ 8.7 $ 15.4 Gross amount of goodwill included in disposal (7.1) — (7.1) Accumulated impairment losses included in disposal 2.2 — 2.2 Carrying amount of goodwill: Gross amount of goodwill 86.5 8.7 95.2 Accumulated impairment losses (84.7) — (84.7) Balance, December 31, 2020 $ 1.8 $ 8.7 $ 10.5 There is no goodwill related to the Land Operations segment. Goodwill Impairment: The goodwill impairment test estimates the fair value of a reporting unit using various methodologies, including an income approach that is based on a discounted cash flow analysis and a market approach that involves the application of market-derived multiples. Valuations performed in conjunction with the Company's goodwill impairment tests for each reporting unit assumes that each is an unrelated business to be sold separately and independently from the other reporting units. The discounted cash flow approach relies on a number of assumptions, including future macroeconomic conditions, market factors specific to the reporting unit, the amount and timing of estimated future cash flows to be generated by the business over an extended period of time and a discount rate that considers the risks related to the amount and timing of the cash flows, among others. Under the market multiple methodology, the estimate of fair value is based on market multiples of EBITDA (earnings before interest, taxes, depreciation and amortization) or revenues. When using market multiples of EBITDA or revenues, the Company must make judgments about the comparability of those multiples in closed and proposed transactions and comparability of multiples for similar companies. If the results of the Company's test indicates that a reporting unit's estimated fair value is less than its carrying value, an impairment charge is recognized for the amount by which the carrying amount exceeds the reporting unit's fair value, not to exceed the total amount of goodwill allocated to that reporting unit. Based on the results of the valuation performed in conjunction with the Company's annual goodwill impairment test in 2019, the carrying amounts of the GPC and GPRS reporting units exceeded their estimated fair values and goodwill was determined to be impaired. The decline in fair value was due primarily to persisting, competitive market pressures that negatively affected sales and margins. As a result, the Company recorded a non-cash impairment charge of $37.2 million during the fourth quarter of 2018. During the quarter ended September 30, 2019, the Company was required to perform an interim impairment test for the goodwill in each of its three M&C reporting units due to the continued decline in M&C sales and margins in 2019, which resulted from continued, adverse market conditions. Based on the results of the valuation performed in conjunction with this test, the carrying amounts of the three M&C reporting units exceeded their estimated fair values and goodwill was determined to be impaired. As a result, the Company recorded a non-cash impairment charge of $49.7 million during the third quarter of 2019. The Company's goodwill and impairment test estimated the fair value of the M&C reporting units using various methodologies, including a market approach that involves the application of market-derived multiples and an income approach that was based on a discounted cash flow analysis. The Company classified these fair value measurements as Level 3. The weighted-average discount rate used in the 2018 valuation and 2019 valuation was 13.6% and 12.7%, respectively.

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2020
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The fair value of the Company's cash and cash equivalents, accounts receivable, net and short-term borrowings approximate their carrying values due to the short-term nature of the instruments. The fair value of the Company's notes receivable approximates the carrying amount of $11.5 million at December 31, 2020. The fair value and carrying amount of these notes was $15.7 million at December 31, 2019. The fair value of these notes is estimated using a discounted cash flow analysis in which the Company uses unobservable inputs such as market interest rates determined by the loan-to-value and market capitalization rates related to the underlying collateral at which management believes similar loans would be made and classified as a Level 3 measurement in the fair value hierarchy. At December 31, 2020, the carrying amount of the Company's notes payable and other debt was $687.1 million and the corresponding fair value was $704.1 million. At December 31, 2019, the carrying amount of the Company's notes payable and other debt was $704.6 million and the corresponding fair value was $727.3 million. The fair value of debt is calculated by discounting the future cash flows of the debt at rates based on instruments with similar risk, terms and maturities as compared to the Company's existing debt arrangements (Level 3). The Company records its interest rate swaps at fair value. The fair values of the Company's interest rate swaps (Level 2 measurements) are based on the estimated amounts that the Company would receive or pay to terminate the contracts at the reporting date and are determined using interest rate pricing models and interest rate related observable inputs (refer to Note 11 for fair value information regarding the Company's derivative instruments).

Notes Payable and Other Debt

Notes Payable and Other Debt	12 Months Ended
	Dec. 31, 2020
Debt Disclosure [Abstract]
Notes Payable and Other Debt	Notes Payable and Other Debt As of December 31, 2020 and 2019, Notes payable and other debt consisted of the following (in millions): Principal Outstanding Debt Interest Rate (%) Maturity Date December 31, 2020 December 31, 2019 Secured: Kailua Town Center (1) 2021 $ 9.8 $ 10.2 Kailua Town Center #2 3.15% 2021 4.5 4.6 Heavy Equipment Financing (2) (2) 3.2 3.6 Laulani Village 3.93% 2024 61.3 62.0 Pearl Highlands 4.15% 2024 81.4 83.4 Manoa Marketplace (3) 2029 57.9 59.5 Subtotal $ 218.1 $ 223.3 Unsecured: Series D Note —% 2020 — 16.2 Bank syndicated loan (4) 2023 50.0 50.0 Series A Note 5.53% 2024 28.4 28.5 Series J Note 4.66% 2025 10.0 10.0 Series B Note 5.55% 2026 46.0 46.0 Series C Note 5.56% 2026 22.0 23.0 Series F Note 4.35% 2026 19.7 22.0 Series H Note 4.04% 2026 50.0 50.0 Series K Note 4.81% 2027 34.5 34.5 Series G Note 3.88% 2027 29.6 35.0 Series L Note 4.89% 2028 18.0 18.0 Series I Note 4.16% 2028 25.0 25.0 Term Loan 5 4.30% 2029 25.0 25.0 Subtotal $ 358.2 $ 383.2 Revolving Credit Facilities: GLP Asphalt revolving credit facility (5) 2021 — — A&B Revolver (6) 2022 111.0 98.7 Subtotal $ 111.0 $ 98.7 Total Debt (contractual) $ 687.3 $ 705.2 Unamortized debt premium (discount) — (0.1) Unamortized debt issuance costs (0.2) (0.5) Total debt (carrying value) $ 687.1 $ 704.6 (1) Loan has a stated interest rate of LIBOR plus 1.50%, but is swapped through maturity to a 5.95% fixed rate. (2) Loans have a weighted average stated interest rate of approximately 3.0% and stated maturity dates ranging from 2021 to 2024. (3) Loan has a stated interest rate of LIBOR plus 1.35% but is swapped through maturity to a 3.14% fixed rate. (4) Loan has a stated interest rate of LIBOR plus 2.00% but is swapped through maturity to a 3.35% fixed rate. (5) Loan has a stated interest rate of LIBOR plus 1.25%. (6) Loan has a stated interest rate of LIBOR plus 2.05%, based on pricing grid. The Company's notes payable and other debt is categorized between debt instruments secured by real estate improved properties or other assets ("Secured Debt"), unsecured notes payable and other term loans ("Unsecured Debt") and lines of credit and borrowings under revolving credit facilities ("Revolving Credit Facilities") which includes the existing revolving credit facility used for general Company purposes ("A&B Revolver"), as well as a revolving credit facility related to one of the consolidated subsidiaries in the M&C segment (the "GLP Asphalt Revolving Credit Facility"). Secured Debt Kailua Town Center: On December 20, 2013, the Company consummated the acquisition of the Kailua Portfolio, a collection of retail assets on Oahu. In connection with the acquisition of the Kailua Portfolio, the Company assumed a $12.0 million mortgage note, which matures in September 2021, and an interest rate swap that effectively converts the floating rate debt to a fixed rate of 5.95% (refer to Note 11). As of December 31, 2020, the balance of the mortgage note was $9.8 million. The Company also secured a $5.0 million second mortgage on the Kailua Portfolio during the first quarter of 2017, which bears interest at 3.15% and matures in 2021. The second mortgage has an outstanding balance at December 31, 2020 of $4.5 million. Heavy Equipment Financing: In connection with the M&C segment, the Company enters into leases for machinery and equipment related to its businesses that are classified as finance leases. Finance leases are further discussed in Note 15. Laulani Village: In connection with asset acquisitions of commercial real estate improved properties made in the year ended December 31, 2018, the Company assumed a $62.0 million mortgage secured by Laulani Village that matures on May 1, 2024. The note bears interest at 3.93% and requires monthly interest payments of approximately $0.2 million until May 2020 and principal and interest payments of approximately $0.3 million thereafter. Pearl Highlands: On September 17, 2013, the Company consummated the acquisition of Pearl Highlands Center in Pearl City, Oahu. In connection with the acquisition, the Company assumed a $59.3 million mortgage loan secured by Pearl Highlands Center. On December 1, 2014, the loan was refinanced to increase the amount of the loan to $92.0 million (bearing interest at 4.15%). The refinanced loan requires monthly principal and interest payments of approximately $0.4 million and requires a final principal payment of approximately $73.0 million due on December 8, 2024. Manoa Marketplace: In 2016, the Company, through wholly-owned subsidiaries, entered into a $60.0 million mortgage loan agreement secured by Manoa Marketplace with First Hawaiian Bank ("FHB"). Such loan bears interest at LIBOR plus 1.35% and requires principal and interest payments over the term with a final principal payment of $41.7 million due on August 1, 2029. The Company had previously entered into an interest rate swap with a notional amount equal to the principal amount on the debt to fix the variable interest rate on the related periodic interest payments at an effective rate of 3.14% (refer to Note 11). Assets Pledged as Collateral: The gross book value of the commercial real estate assets pledged as collateral described above at December 31, 2020 was $375.5 million. Unsecured Debt Prudential Series Notes: In December 2015, the Company entered into an agreement (the "Prudential Agreement") with Prudential Investment Management, Inc. and its affiliates (collectively, "Prudential") for an unsecured note purchase and private shelf facility that enabled the Company to issue notes in an aggregate amount up to $450.0 million, less the sum of all principal amounts then outstanding on any notes issued by the Company or any of its subsidiaries to Prudential and the amounts of any notes that are committed under the Prudential Agreement. The Prudential Agreement (which amended and renewed a then-existing agreement) had an issuance period that ended in December 2018 and contained certain restrictive covenants for the notes issued under the Prudential Agreement that were substantially the same as the covenants contained in the Historical Revolving Credit Facility (defined below). Borrowings under the uncommitted shelf facility bear interest at rates that were determined at the time of borrowing. In September 2017, the Company entered into an amendment of the Prudential Agreement (the "Pru Amendment"), which amended certain covenants (see below). Additionally, the Pru Amendment included a provision for a contingent incremental interest rate increase of 20 basis points on all outstanding notes that was based on the Company's ratio of debt to total adjusted asset value (as defined in the Pru Amendment) measured against the provision's allowed ratio 0.35 to 1.0 from the date of the amendment through September 30, 2018. If triggered, the contingent interest rate adjustment would continue until such time that the Company's ratio of debt to total adjusted asset value declined to 0.35 to 1.0 or below (at which point the provision would have no further force or effect). In October 2018, the provision was triggered and interest rates for all Prudential Series Notes increased by 20 basis points. In March 2019, based on the Company's subsequent leverage-based ratio falling below the provision's threshold, the interest rates for all Prudential Series Notes returned to their originally stated amounts at the time of the borrowing. Bank Syndicated Loan: In February 2018, the Company entered into an agreement with Wells Fargo Bank, National Association ("Wells Fargo") and a syndicate of other financial institutions that provides for a $50.0 million term loan facility ("Wells Fargo Term Facility" or "Bank Syndicated Loan"). The Company also drew $50.0 million under the Wells Fargo Term Facility in February 2018 and used such term loan proceeds to repay amounts that were borrowed under revolving credit facilities described below. Borrowings under the Wells Fargo Term Facility bear interest at a variable base rate, as defined, plus a margin that is determined using a leverage based pricing grid. In February 2020 the Company entered into an interest rate swap agreement with a notional amount equal to the principal amount of the debt to fix the variable interest rate on the related periodic interest payments resulting in an effective rate (subject to changes in the margin based on a pricing grid) of 3.35% as of December 31, 2020 (refer to Note 11). Term Loan 5: In November 2017, the Company entered into a rate lock commitment to draw $25.0 million under its Note Purchase and Private Shelf Agreement with AIG Asset Management (U.S.), LLC. Under the commitment, the Company drew $25.0 million in December 2017. The note bears interest at 4.30% and matures on December 20, 2029. Interest only is paid semi-annually and the principal balance is due at maturity. Revolving credit facilities GLP Asphalt Revolving Credit Facility: At December 31, 2017, the Company had, at one of its consolidated subsidiaries, GLP Asphalt, a $30.0 million line of credit (the "GLP Asphalt Revolving Credit Facility"). The GLP Asphalt Revolving Credit Facility is collateralized by the subsidiary's accounts receivable, inventory and equipment and may only be used for asphalt purchase. The Company and the noncontrolling interest holders are guarantors, on a several basis, for their pro rata shares (based on membership interests) of borrowings under the line of credit. In September 2018, GLP Asphalt entered into a Third Amended Credit Agreement with Wells Fargo, which amended and extended its existing $30.0 million committed revolving credit facility, reduced the interest rate by 25 basis points and added a fee of 20 basis points on the unused amount of the GLP Asphalt Revolving Credit Facility. The GLP Asphalt Revolving Credit Facility maturity has a current maturity of April 26, 2021. The GLP Asphalt Revolving Credit Facility contains certain restrictive covenants. Based on its net income after taxes in the year ended December 31, 2019 and December 31, 2020, GLP was not in compliance with all of the covenants and received waivers on such requirements. As noted in the table above, as of December 31, 2019 and December 31, 2020, there was no outstanding balance on the GLP Asphalt Revolving Credit Facility. A&B Revolver: The Company had a revolving senior credit facility that provided for an aggregate $350.0 million, five-year unsecured commitment (the "Historical Revolving Credit Facility"), with an uncommitted $100.0 million increase option. The Historical Revolving Credit Facility also provided for a $100.0 million sub-limit for the issuance of standby and commercial letters of credit and an $80.0 million sub-limit for swing line loans. Amounts drawn under the facilities would bear interest at a stated rate, as defined, plus a margin that is determined based on a pricing grid using the ratio of debt to total adjusted asset value, as defined. The agreement contained certain restrictive covenants, the most significant of which requires the maintenance of minimum shareholders’ equity levels, minimum EBITDA to fixed charges ratio, maximum debt to total assets ratio, minimum unencumbered income-producing asset value to unencumbered debt ratio, and limitations on priority debt, as defined in the agreement. In December 2015, the Historical Revolving Credit Facility was amended to extend the maturity date to December 2020. In September 2017, the Company entered into a Second Amended and Restated Credit Agreement ("A&B Revolver") with Bank of America N.A., as administrative agent, First Hawaiian Bank, and other lenders party thereto, which amended and restated the existing $350.0 million commitment under the Historical Revolving Credit Facility. The A&B Revolver increased the total revolving commitments to $450.0 million, extended the term of the facilities to September 15, 2022, amended certain covenants (see below), and reduced the interest rates and fees charged under the Historical Revolving Credit Facility. All other terms under the Historical Revolving Credit Facility remained substantially unchanged. At December 31, 2020, the Company had $111.0 million of revolving credit borrowings outstanding, $1.1 million in letters of credit had been issued against the facility, and $337.9 million remained available. Covenants under A&B Revolver and Pru Amendment (subsequent to amendments) The principal amendments under the A&B Revolver and the Pru Amendment are as follows: • An increase in the maximum ratio of debt to total adjusted asset value from 0.5:1.0 to 0.6:1.0. • An increase in the aggregate maximum amount of priority debt at any time from 20% to 25%. • Allows the Company to consummate the holding company merger to adopt certain governance changes and facilitate the Company's ongoing compliance with REIT requirements. • Sets the minimum shareholders' equity amount to be $850.6 million plus 75% of the net proceeds received from equity issuances, less non-recurring costs related to the REIT conversion, among other additions and subtractions. • Allows for the payment of minimum dividends required to maintain REIT status and other dividends in any amount so long as no event of default shall then exist or would exist after giving effect to such dividends. Debt principal payments At December 31, 2020, debt principal payments and maturities during the next five years and thereafter and the corresponding amount of unamortized deferred financing costs or debt discounts or premiums were as follows (in millions): Scheduled principal payments 2021 2022 2023 2024 2025 There- after Total (Unamort Total Secured debt $ 20.4 $ 6.0 $ 5.9 $ 134.9 $ 1.9 $ 49.0 $ 218.1 $ (0.1) $ 218.0 Unsecured debt 23.1 24.1 78.6 22.0 38.3 172.1 358.2 (0.1) 358.1 Revolving credit facilities — 111.0 — — — — 111.0 — 111.0 Total Notes payable and other debt $ 43.5 $ 141.1 $ 84.5 $ 156.9 $ 40.2 $ 221.1 $ 687.3 $ (0.2) $ 687.1

Derivative Instruments

Derivative Instruments	12 Months Ended
	Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments	Derivative Instruments The Company is exposed to interest rate risk related to its variable-rate debt. The Company balances its cost of debt and exposure to interest rates primarily through its mix of fixed-rate and variable-rate debt. From time to time, the Company may use interest rate swaps to manage its exposure to interest rate risk. Cash flow hedges of interest rate risk The Company has two interest rate swap agreements designated as cash flow hedges whose key terms are as follows (dollars in millions): Effective Maturity Fixed Notional Amount at Asset (Liability) Fair Value at Classification on Date Date Interest Rate December 31, 2020 December 31, 2020 December 31, 2019 Balance Sheet 4/7/2016 8/1/2029 3.14% $ 57.9 $ (4.8) $ (0.2) Accrued and other liabilities 2/13/2020 2/27/2023 3.35% $ 50.0 $ (1.3) N/A Accrued and other liabilities Liabilities related to the interest rate swap are presented within Accrued and other liabilities and assets are presented within Prepaid expenses and other assets in the consolidated balance sheets. The changes in fair value of the cash flow hedge are recorded in accumulated other comprehensive income (loss) and subsequently reclassified into interest expense as interest is incurred on the related variable-rate debt. The following table represents the pre-tax effect of the derivative instruments in the Company's consolidated statement of comprehensive income (loss) during the years ended December 31, 2020 and 2019 (in millions): 2020 2019 Derivatives in Designated Cash Flow Hedging Relationships: Amount of gain (loss) recognized in OCI on derivatives $ (6.9) $ (4.0) Impact of reclassification adjustment to interest expense included in Net Income (Loss) $ 1.0 $ (0.1) As of December 31, 2020, the Company expects to reclassify $1.6 million of net gains (losses) on derivative instruments from accumulated other comprehensive income to earnings during the next 12 months. Non-designated hedges As of December 31, 2020, the Company has one interest rate swap that has not been designated as a cash flow hedge, whose key terms are as follows (dollars in millions): Effective Maturity Fixed Notional Amount at Asset (Liability) Fair Value at Classification on Date Date Interest Rate December 31, 2020 December 31, 2020 December 31, 2019 Balance Sheet 1/1/2014 9/1/2021 5.95% $ 9.8 $ (0.3) $ (0.5) Accrued and other liabilities The Company records gains or losses related to interest rate swaps that have not been designated as cash flow hedges in Interest and other income (expense), net in its consolidated statements of operations. There were $0.2 million of gains recognized in 2020 and no amounts recognized in 2019 related to changes in fair value. The Company measures all of its interest rate swaps at fair value. The fair values of the Company's interest rate swaps (Level 2) are based on the estimated amounts that the Company would receive or pay to terminate the contracts at the reporting date and are determined using interest rate pricing models and interest rate related observable inputs.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Commitments and other financial arrangements The Company has various financial commitments and other arrangements including standby letters of credit and bonds that are not recorded as liabilities on the Company's consolidated balance sheets as of December 31, 2020: • Standby letters of credit issued by the Company's lenders under the Company's revolving credit facilities totaled $1.1 million as of December 31, 2020. These letters of credit primarily relate to the Company's workers' compensation plans and construction activities; if drawn upon the Company would be obligated to reimburse the issuer. • Bonds related to the Company's construction and real estate activities totaled $277.9 million as of December 31, 2020. Approximately $258.6 million represents the face value of construction bonds issued by third party sureties (bid, performance and payment bonds), and the remainder is related to commercial bonds issued by third party sureties (permit, subdivision, license and notary bonds); if drawn upon, the Company would be obligated to reimburse the surety that issued the bond for the amount of the bond, reduced for the work completed to date. As of December 31, 2020, the Company's maximum remaining exposure, in the event of defaults on all existing contractual construction obligations, was approximately $59.2 million. The Company also provides certain bond indemnities and guarantees of indebtedness for certain of its unconsolidated affiliates that it accounts for as equity method investments (e.g., real estate joint ventures). • Bond indemnities are provided for the benefit of the surety in exchange for the issuance of surety bonds and cover joint venture construction activities (such as project amenities, roads, utilities, and other infrastructure). Under such bond indemnities, the Company and the joint venture partners agree to indemnify the surety bond issuer from all losses and expenses arising from the failure of the joint venture to complete the specified bonded construction; the Company may be obligated to complete construction of the joint ventures' construction projects if the joint venture does not perform. The maximum potential amount of aggregate future payments is a function of the amount covered by outstanding bonds at the time of default by the joint venture, reduced by the amount of work completed to date. • Guarantees of indebtedness may be provided by the Company for the benefit of financial institutions providing credit to unconsolidated equity method investees. As of December 31, 2020, the Company had one arrangement with third party lenders that provided for a limited guarantee on any outstanding amounts related to an unconsolidated equity method investee's line of credit; related to borrowings on such line of credit by the equity method investee, there was none outstanding as of December 31, 2020. The recorded amounts of the bond indemnities and guarantee of indebtedness were not material individually or in the aggregate. Other than those described above, obligations of the Company's joint ventures do not have recourse to the Company, and the Company's "at-risk" amounts are limited to its investment. Legal proceedings and other contingencies Prior to the sale of approximately 41,000 acres of agricultural land on Maui to Mahi Pono Holdings, LLC ("Mahi Pono") in December 2018, the Company, through East Maui Irrigation Company, LLC ("EMI"), also owned approximately 16,000 acres of watershed lands in East Maui and also held four water licenses to approximately 30,000 acres owned by the State of Hawai‘i in East Maui. The sale to Mahi Pono included the sale of a 50% interest in EMI (which closed February 1, 2019), and provided for the Company and Mahi Pono, through EMI, to jointly continue the existing process to secure a long-term lease from the State for delivery of irrigation water to Mahi Pono for use in Central Maui. The last of these water license agreements expired in 1986, and all four agreements were then extended as revocable permits that were renewed annually. In 2001, a request was made to the State Board of Land and Natural Resources (the "BLNR") to replace these revocable permits with a long-term water lease. Pending the completion by the BLNR of a contested case hearing it ordered to be held on the request for the long-term lease, the BLNR has kept the existing permits on a holdover basis. Three parties (Healoha Carmichael; Lezley Jacintho; and Na Moku Aupuni O Ko‘olau Hui) filed a lawsuit on April 10, 2015 (the "Initial Lawsuit") alleging that the BLNR has been renewing the revocable permits annually rather than keeping them in holdover status. The lawsuit asked the court to void the revocable permits and to declare that the renewals were illegally issued without preparation of an environmental assessment ("EA"). In December 2015, the BLNR decided to reaffirm its prior decisions to keep the permits in holdover status. This decision by the BLNR was challenged by the three parties. In January 2016, the court ruled in the Initial Lawsuit that the renewals were not subject to the EA requirement, but that the BLNR lacked legal authority to keep the revocable permits in holdover status beyond one year (the "Initial Ruling"). The Initial Ruling was appealed to the Intermediate Court of Appeals ("ICA") of the State of Hawai‘i. In May 2016, while the appeal of the Initial Ruling was pending, the Hawai‘i State Legislature passed House Bill 2501, which specified that the BLNR has the legal authority to issue holdover revocable permits for the disposition of water rights for a period not to exceed three years. The governor signed this bill into law as Act 126 in June 2016. Pursuant to Act 126, the annual authorization of the existing holdover permits was sought and granted by the BLNR in December 2016, November 2017 and November 2018 for calendar years 2017, 2018 and 2019. No extension of Act 126 was approved by the Hawai‘i State Legislature in 2019. In June 2019, the ICA vacated the Initial Ruling, effectively reversing the determination that the BLNR lacked authority to keep the revocable permits in holdover status beyond one year (the "ICA Ruling"). The ICA remanded the case back to the trial court to determine whether the holdover status of the permits was both (a) "temporary" and (b) in the best interest of the State, as required by statute. The plaintiffs filed a motion with the ICA for reconsideration of its decision, which was denied on July 5, 2019. On September 30, 2019, the plaintiffs filed a request with the Supreme Court of Hawai‘i to review and reverse the ICA Ruling. On November 25, 2019, the Supreme Court of Hawai‘i granted the plaintiffs' request to review the ICA Ruling. On October 11, 2019, the BLNR took up the renewal of all the existing water revocable permits in the state, acting under the ICA Ruling, and approved the continuation of the four East Maui water revocable permits for another one-year period through December 31, 2020; additionally, on November 13, 2020, another renewal of such permits through December 31, 2021 was approved by the BLNR. In a separate matter, on December 7, 2018, a contested case request filed by the Sierra Club (contesting the BLNR's November 2018 approval of the 2019 revocable permits) was denied by the BLNR. On January 7, 2019, Sierra Club filed a lawsuit in the circuit court of the first circuit in Hawai‘i against BLNR, A&B and EMI, seeking to invalidate the 2019 extension of the revocable permits for, among other things, failure to perform an EA. The lawsuit also seeks to have the BLNR enjoin A&B/EMI from diverting more than 25 million gallons a day until a permit or lease is properly issued by the BLNR, and for the imposition of certain conditions on the revocable permits by the BLNR. The count seeking to invalidate the revocable permits based on the failure to perform an EA has been dismissed by the court, based on the ICA Ruling in the Initial Lawsuit. In connection with A&B’s obligation to continue the existing process to secure a long-term water lease from the State, A&B and EMI will defend against the remaining claims made by the Sierra Club. The Company is a party to, or may be contingently liable in connection with, other legal actions arising in the normal conduct of its businesses, the outcomes of which, in the opinion of management after consultation with counsel, would not have a material effect on the Company's consolidated financial statements as a whole. Further note that certain of the Company's properties and assets may become the subject of other types of claims and assessments at various times (e.g., environmental matters based on normal operations of such assets). Depending on the facts and circumstances surrounding such potential claims and assessments, the Company records an accrual if it is deemed probable that a liability has been incurred and the amount of loss can be reasonably estimated/valued as of the date of the financial statements.

Revenue and Contract Balances

Revenue and Contract Balances	12 Months Ended
	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Revenue and Contract Balances	Revenue and Contract Balances The Company generates revenue through its Commercial Real Estate, Land Operations and Materials & Construction segments. Through its Commercial Real Estate segment, the Company owns and operates a portfolio of commercial real estate properties and generates income (i.e., revenue) as a lessor through leases of such assets. Refer to Note 14 for further discussion of lessor income recognition. The Land Operations and Materials & Construction segments generate revenue from contracts with customers. The Company further disaggregates revenue from contracts with customers by revenue type when appropriate if the Company believes disaggregation best depicts how the nature, amount, timing and uncertainty of the Company's revenue and cash flows are affected by economic factors. Revenue by type for the years ended December 31, 2020, 2019 and 2018 was as follows (in millions): 2020 2019 2018 Revenues: Commercial Real Estate $ 150.0 $ 160.6 $ 140.3 Land Operations: Development sales revenue 7.9 57.2 54.3 Unimproved/other property sales revenue 9.7 32.4 210.5 Other operating revenue 23.0 24.5 24.7 Land Operations 40.6 114.1 289.5 Materials & Construction 114.7 160.5 214.6 Total revenues $ 305.3 $ 435.2 $ 644.4 Timing of revenue recognition may differ from the timing of invoicing to customers. Certain construction contracts include retainage provisions that are customary in the industry (i.e., are not for financing purposes) and are included in Accounts receivable and contracts retention, net. The balances billed but not paid by customers pursuant to these provisions generally become due upon completion and acceptance of the project work or products by the customers. Within Prepaid and other assets, the Company records assets for "costs and estimated earnings in excess of billings on uncompleted contracts" which represent amounts earned and reimbursable under contracts, but have a conditional right for billing and payment, such as achievement of milestones or completion of the project. When events or conditions indicate that it is probable that the amounts outstanding become unbillable, the transaction price and associated contract asset is reduced. Within Accrued and other liabilities, the Company records liabilities for "billings in excess of costs and estimated earnings on uncompleted contracts" which represent billings to customers on contracts in advance of work performed, including advance payments negotiated as a contract condition. Generally, unearned project-related costs will be earned over the next twelve months. The following table provides information about receivables, contract assets and contract liabilities from contracts with customers as of December 31, 2020 and 2019: (in millions) 2020 2019 Accounts receivable $ 39.5 $ 43.6 Contracts retention 7.3 8.6 Allowances (credit losses and doubtful accounts) (3.3) (0.6) Accounts receivable and retention, net $ 43.5 $ 51.6 Costs and estimated earnings in excess of billings on uncompleted contracts $ 2.3 $ 10.0 Billings in excess of costs and estimated earnings on uncompleted contracts $ 8.5 $ 7.9 Variable consideration 1 $ 62.0 $ 62.0 Other deferred revenue $ 4.9 $ 5.6 1 Variable consideration deferred as of the period end related to amounts received in the sale of agricultural land on Maui in 2018 that, under revenue recognition guidance, could not be included in the transaction price (refer to Note 23). For the year ended December 31, 2020, the Company recognized revenue of approximately $7.4 million related to the Company's contract liabilities reported as of December 31, 2019. For the year ended December 31, 2019, the Company recognized revenue of approximately $4.7 million related to the Company's contract liabilities reported as of December 31, 2018. Regarding other information related to the Company's contracts with customers, the amount of revenue recognized from performance obligations satisfied in prior periods (e.g., due to changes in transaction price) was not material in any of the periods presented. Further, the total amount of the transaction price allocated to either wholly unsatisfied or partially satisfied performance obligations was $120.8 million and $75.7 million as of December 31, 2020 and 2019, respectively. The Company expects to recognize approximately 50% to 60% of this contract consideration as revenue in 2021, with the remaining recognized thereafter. Finally, additional information related to uncompleted contracts (presented in the contract assets and contract liabilities table above) as of December 31, 2020 and 2019 is as follows (in millions): 2020 2019 Costs incurred on uncompleted contracts $ 389.8 $ 339.3 Estimated earnings 41.1 38.3 Subtotal 430.9 377.6 Billings to date (437.1) (375.5) Total $ (6.2) $ 2.1

Leases - The Company as Lessor

Leases - The Company as Lessor	12 Months Ended
	Dec. 31, 2020
Leases [Abstract]
Leases - The Company as Lessor	Leases - The Company As Lessor The Company leases real estate property to tenants under operating leases. Such activity is primarily composed of operating leases within its CRE segment. Beginning in the quarter ended June 30, 2020, the Company began entering into rent relief arrangements with certain of its tenants due to the disruption from COVID-19 in the form of rent deferrals or other relief modifications that resulted in changes to fixed contractual lease payments for specified months. Such other relief modifications included changing the nature of payments from fixed to variable (i.e., variable based on a percentage of the tenant's sales, typically subject to a minimum "floor" amount) or, in some cases, payment forgiveness. Consistent with lease accounting guidance and recent interpretations provided by the FASB in the Lease Modification Q&A, the Company elected to treat such eligible lease concessions (i.e., such rent deferrals, fixed-to-variable modifications or payment forgiveness arrangements that do not result in a substantial increase in the rights of the lessor or obligations of the lessee) outside of the lease accounting modification framework. For rent deferrals, consistent with an acceptable method described in the Lease Modification Q&A, the Company accounts for the event as if no changes to the lease contract were made and continues to record lease receivables and recognize income during the deferral period. For the other relief modifications mentioned above that resulted in reductions to fixed contractual lease payments, consistent with the Lease Modification Q&A, the Company reports, for periods covered by the modification, reduced rental income (i.e., revenue) equal to the agreed-upon amounts (offset by any variable lease payments). The Company continues to assess collectability on all such amounts due under leases and only recognizes revenue to the extent such amounts are probable of collection (or payment is received). During the year ended December 31, 2020, the Company projected a higher amount of uncollectable tenant billings due to COVID-19 and, as a result, the Company recorded reductions in revenue of $15.4 million related to aggregate charges for CRE accounts receivable and unbilled straight-line lease receivables for which the Company assessed that the tenant's future payment of amounts due under leases was not probable. Further, during the year ended December 31, 2020, the Company recorded reductions of revenue of $3.6 million related to the allowance for doubtful accounts for other impacted operating lease receivables. As a result of COVID-19, certain tenants experiencing economic difficulties have sought and may continue to seek current and future rent relief, which may be provided in the form of additional rent deferrals or other relief modifications, among other possible agreements. The Company is evaluating each request on a case-by-case basis and will apply lease accounting guidance (including the Lease Modification Q&A) consistently to leases with similar characteristics and similar circumstances. The future impact of any potential rent concessions in the context of lease accounting guidance and the Lease Modification Q&A is dependent upon the extent of relief granted to tenants as a result of COVID-19 in future periods and the elections made by the Company at the time of entering into such agreements. The historical cost of, and accumulated depreciation on, leased property as of December 31, 2020 and 2019 was as follows (in millions): 2020 2019 Leased property - real estate $ 1,525.3 $ 1,511.3 Less: Accumulated depreciation (152.2) (125.0) Property under operating leases, net $ 1,373.1 $ 1,386.3 Total rental income (i.e., revenue) under these operating leases relating to lease payments and variable lease payments were as follows (in millions): 2020 2019 Lease payments $ 113.7 $ 111.2 Variable lease payments 39.3 51.8 Total rental income $ 153.0 $ 163.0 Under historical lease guidance, contingent rentals amounted to $4.7 million for the year ended December 31, 2018. Contractual future lease payments to be received on non-cancelable operating leases as of December 31, 2020 were as follows (in millions): 2021 $ 119.3 2022 109.2 2023 98.4 2024 85.4 2025 73.2 Thereafter 502.3 Total future lease payments to be received $ 987.8

Leases - The Company as Lessee

Leases - The Company as Lessee	12 Months Ended
	Dec. 31, 2020
Leases [Abstract]
Leases - The Company as Lessee	Leases - The Company As Lessee Principal non-cancelable operating leases include land, office space, harbors and equipment that have lease terms that expire through 2043. Management expects that in the normal course of business, most operating leases will be renewed or replaced by other similar leases. The Company has equipment under finance leases with lease terms that expire through 2024. Lease expense for operating leases that provide for future escalations are accounted for on a straight-line basis. For the year ended December 31, 2020, lease expense under operating and finance leases was as follows (in millions): 2020 2019 Lease cost - operating and finance leases: Operating lease cost $ 4.6 $ 5.1 Finance lease cost: Amortization of right-of-use assets 1.2 0.6 Interest on lease liabilities 0.1 0.1 Total lease cost - operating and finance leases $ 5.9 $ 5.8 Amounts related to other lease transactions: Short-term lease cost $ 0.6 $ 0.7 Variable lease cost $ 0.6 $ 0.5 Sublease income $ 0.3 $ 0.3 For the year ended December 31, 2018, prior to the guidance in ASC 842, lease expense for operating leases totaled $6.1 million. Other amounts relating to leases segregated between those for finance and operating leases include the following for the year ended December 31, 2020 and December 31, 2019 (in millions): 2020 2019 Cash paid for amounts included in the measurement of lease liabilities: Operating cash outflows from operating leases $ 4.6 $ 5.3 Operating cash outflows from financing leases $ 0.1 $ 0.1 Financing cash flows from finance leases $ 1.2 $ 0.6 Other details: Weighted-average remaining lease term (years) - operating leases 9.1 9.3 Weighted-average remaining lease term (years) - finance leases 2.9 3.3 Weighted-average discount rate - operating leases 4.4 % 4.4 % Weighted-average discount rate - finance leases 3.2 % 3.1 % Future lease payments under non-cancelable operating and finance leases as of December 31, 2020 were as follows (in millions): Operating Leases Finance Leases 2021 $ 4.6 $ 1.4 2022 4.6 1.0 2023 3.4 0.7 2024 2.7 0.2 2025 1.2 — Thereafter 7.9 — Total lease payments $ 24.4 $ 3.3 Less: Interest (6.0) (0.1) Total lease liabilities $ 18.4 $ 3.2 ROU assets and lease liabilities related to operating leases are presented separately on the consolidated balance sheets. Information for finance leases as of the years ended December 31, 2020 and 2019 were as follows (in millions): 2020 2019 ROU assets $ 4.2 $ 3.8 Lease liabilities $ 3.2 $ 3.5
Leases - The Company as Lessee	Leases - The Company As Lessee Principal non-cancelable operating leases include land, office space, harbors and equipment that have lease terms that expire through 2043. Management expects that in the normal course of business, most operating leases will be renewed or replaced by other similar leases. The Company has equipment under finance leases with lease terms that expire through 2024. Lease expense for operating leases that provide for future escalations are accounted for on a straight-line basis. For the year ended December 31, 2020, lease expense under operating and finance leases was as follows (in millions): 2020 2019 Lease cost - operating and finance leases: Operating lease cost $ 4.6 $ 5.1 Finance lease cost: Amortization of right-of-use assets 1.2 0.6 Interest on lease liabilities 0.1 0.1 Total lease cost - operating and finance leases $ 5.9 $ 5.8 Amounts related to other lease transactions: Short-term lease cost $ 0.6 $ 0.7 Variable lease cost $ 0.6 $ 0.5 Sublease income $ 0.3 $ 0.3 For the year ended December 31, 2018, prior to the guidance in ASC 842, lease expense for operating leases totaled $6.1 million. Other amounts relating to leases segregated between those for finance and operating leases include the following for the year ended December 31, 2020 and December 31, 2019 (in millions): 2020 2019 Cash paid for amounts included in the measurement of lease liabilities: Operating cash outflows from operating leases $ 4.6 $ 5.3 Operating cash outflows from financing leases $ 0.1 $ 0.1 Financing cash flows from finance leases $ 1.2 $ 0.6 Other details: Weighted-average remaining lease term (years) - operating leases 9.1 9.3 Weighted-average remaining lease term (years) - finance leases 2.9 3.3 Weighted-average discount rate - operating leases 4.4 % 4.4 % Weighted-average discount rate - finance leases 3.2 % 3.1 % Future lease payments under non-cancelable operating and finance leases as of December 31, 2020 were as follows (in millions): Operating Leases Finance Leases 2021 $ 4.6 $ 1.4 2022 4.6 1.0 2023 3.4 0.7 2024 2.7 0.2 2025 1.2 — Thereafter 7.9 — Total lease payments $ 24.4 $ 3.3 Less: Interest (6.0) (0.1) Total lease liabilities $ 18.4 $ 3.2 ROU assets and lease liabilities related to operating leases are presented separately on the consolidated balance sheets. Information for finance leases as of the years ended December 31, 2020 and 2019 were as follows (in millions): 2020 2019 ROU assets $ 4.2 $ 3.8 Lease liabilities $ 3.2 $ 3.5

Share-Based Payment Awards

Share-Based Payment Awards	12 Months Ended
	Dec. 31, 2020
Share-based Payment Arrangement [Abstract]
Share-Based Payment Awards	Share-Based Payment Awards The 2012 Incentive Compensation Plan ("2012 Plan") allows for the granting of stock options, restricted stock units and common stock. During 2018, the Company retroactively approved an increase to the shares of common stock reserved for issuance at January 1, 2018 from 4.3 million shares to 5.3 million shares. As of December 31, 2020 there were 1.4 million remaining shares available for grants. The shares of common stock authorized to be issued under the 2012 Plan may be drawn from the shares of the Company's authorized but unissued common stock or from shares of its common stock that the Company acquires, including shares purchased on the open market or private transactions. The 2012 Plan consists of four separate incentive compensation programs: (i) the discretionary grant program, (ii) the stock issuance program, (iii) the incentive bonus program and (iv) the automatic grant program for the non-employee members of the Company’s Board of Directors. Share-based compensation is generally awarded under three of the four programs, as more fully described below. Discretionary Grant Program: Under the Discretionary Grant Program, stock options may be granted with an exercise price no less than 100% of the fair market value (defined as the closing market price) of the Company’s common stock on the date of the grant. Options generally become exercisable ratably over three years and have a maximum contractual term of ten years. There were no option grants in 2020, 2019 or 2018, and the Company currently has no plans to issue options in the future. Stock Issuance Program: Under the Stock Issuance Program, shares of common stock or restricted stock units may be granted . Equity awards granted may be designated as time-based awards or market-based performance awards. Automatic Grant Program: At each annual shareholder meeting, non-employee directors will receive an award of restricted stock units that entitle the holder to an equivalent number of shares of common stock upon vesting. The following table summarizes the Company's stock option activity for the year ended December 31, 2020 (in thousands, except weighted-average exercise price and weighted-average contractual life): 2012 Plan Weighted- Weighted- Aggregate Outstanding, January 1, 2020 352.2 $ 13.95 Exercised (254.3) $ 13.62 Canceled — $ — Outstanding, December 31, 2020 97.9 $ 14.80 1.0 year $ 221.7 Vested or expected to vest 97.9 $ 14.80 1.0 year $ 221.7 Exercisable, December 31, 2020 97.9 $ 14.80 1.0 year $ 221.7 The following table summarizes non-vested restricted stock unit activity for the year ended December 31, 2020 (in thousands, except weighted-average grant-date fair value amounts): 2012 Plan Weighted- Outstanding, January 1, 2020 454.7 $ 27.33 Granted 286.2 $ 22.01 Vested (135.3) $ 25.14 Canceled (55.1) $ 23.93 Outstanding, December 31, 2020 550.5 $ 25.44 The time-based restricted stock units granted to employees vest ratably over a period of three years. The time-based restricted stock units granted to non-employee directors prior to 2018 vest ratably over a period of three years, and commencing in 2018, the time-based restricted stock units granted to non-employee directors vest over one year. The market-based performance share units cliff vest over three years, provided that the total shareholder return of the Company's common stock over the relevant period meets or exceeds pre-defined levels of total shareholder returns relative to indices, as defined. As of December 31, 2020, there was $5.7 million of total unrecognized compensation cost related to non-vested restricted stock units granted under the 2012 plan; that cost is expected to be recognized over a period of three years. The fair value of the Company's time-based awards is determined using the Company's stock price on the date of grant. The fair value of the Company's market-based awards is estimated using the Company's stock price on the date of grant and the probability of vesting using a Monte Carlo simulation with the following weighted-average assumptions: 2020 Grants 2019 Grants 2018 Grants Volatility of A&B common stock 22.6 % 23.6 % 22.7 % Average volatility of peer companies 22.5 % 24.2 % 21.6 % Risk-free interest rate 1.3 % 2.5 % 2.3 % The weighted-average grant date fair value of the time-based restricted units and market-based performance share units granted in 2020, 2019 and 2018 was $22.01, $20.05 and $28.76, respectively. No compensation cost is recognized for actual forfeitures of time-based or market-based awards if an employee is terminated prior to rendering the requisite service period. There was no tax benefit realized upon vesting for the years ended December 31, 2020, 2019 and 2018. The Company recognizes compensation cost net of actual forfeitures of time-based or market-based awards. A summary of compensation cost related to share-based payments is as follows for the years ended December 31, 2020, 2019 and 2018 (in millions): 2020 2019 2018 Share-based expense: Time-based and market-based restricted stock units $ 5.8 $ 5.4 $ 4.7 Total share-based expense 5.8 5.4 4.7 Total recognized tax benefit — — — Share-based expense (net of tax) $ 5.8 $ 5.4 $ 4.7 Cash received upon option exercise $ 3.5 $ 2.6 $ 0.4 Intrinsic value of options exercised $ 0.5 $ 2.6 $ 0.4 Tax benefit realized upon option exercise $ — $ — $ — Fair value of stock vested $ 3.0 $ 4.5 $ 4.0

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2020
Retirement Benefits [Abstract]
Employee Benefit Plans	Employee Benefit Plans The Company has funded single-employer defined benefit pension plans that cover certain non-bargaining unit employees and bargaining unit employees of the Company, excluding Grace Pacific. In addition, the Company has plans that provide retiree health care and life insurance benefits to certain salaried and hourly employees. Employees are generally eligible for such benefits upon retirement and completion of a specified number of years of credited service. The Company does not pre-fund these health care and life insurance benefits and has the right to modify or terminate certain of these plans in the future. Certain groups of retirees pay a portion of the benefit costs. Benefit Obligations, Plan Assets and Funded Status of the Plans: The measurement date for the Company’s benefit plan disclosures is December 31 of each year. The status of the funded defined benefit pension plan and the unfunded accumulated post-retirement benefit plans at December 31, 2020 and 2019 and are shown below (in millions): Pension Benefits Other Post-retirement Benefits Non-qualified Plan Benefits 2020 2019 2020 2019 2020 2019 Change in Benefit Obligation Benefit obligation at beginning of year $ 204.4 $ 189.6 $ 10.1 $ 10.6 $ 2.8 $ 2.7 Service cost 0.8 2.3 0.1 0.1 — 0.1 Interest cost 6.5 8.0 0.3 0.4 0.1 0.1 Plan participants’ contributions — — 0.8 0.8 — — Actuarial (gain) loss 21.1 19.0 3.7 (0.3) 0.2 0.2 Benefits paid (14.1) (14.5) (1.5) (1.5) — (0.3) Settlement — — — — — — Benefit obligation at end of year $ 218.7 $ 204.4 $ 13.5 $ 10.1 $ 3.1 $ 2.8 Change in Plan Assets Fair value of plan assets at beginning of year $ 190.5 $ 173.6 $ — $ — $ — $ — Actual return on plan assets 24.2 31.4 — — — — Employer contributions — — 0.7 0.8 — 0.3 Participant contributions — — 0.8 0.7 — — Benefits paid (14.1) (14.5) (1.5) (1.5) — (0.3) Settlement — — — — — — Fair value of plan assets at end of year $ 200.6 $ 190.5 $ — $ — $ — $ — Funded Status (Recognized Liability 1 ) $ (18.1) $ (13.9) $ (13.5) $ (10.1) $ (3.1) $ (2.8) 1 Presented as Accrued pension and post-retirement benefits as of December 31, 2020 and 2019. Benefit Plan Assets Investment Policies and Target Asset Allocations: As the plan sponsor for its defined benefit pension plan, the Company is responsible for the investment and management of the pension plan assets. The Company manages the pension plan assets based upon a liability-driven investment strategy, which seeks to increase the correlation of the pension plan assets and liabilities to reduce the volatility of the plan's funded status and, over time, improve the funded status of the plan. As a result, the asset allocation of the defined benefit pension plan is weighted toward fixed income investments, which reduces investment volatility, but also reduces investment returns over time. In connection with the liability-driven investment strategy, the Company appointed an investment adviser that directs investments and selects investment options, based on established guidelines. The Company’s target allocation by asset category as of December 31, 2020, and the weighted-average asset allocations at December 31, 2020 and 2019 were as follows: Target 2020 2019 Fixed income securities 1 100 % 99 % 99 % Cash and cash equivalents — % 1 % 1 % Total 100 % 100 % 100 % 1 Fixed income securities include investment-grade corporate bonds from diversified industries and U.S. Treasuries. Fair Value of Plan Assets: The fair values of the Company’s defined benefit pension plan assets at December 31, 2020 and 2019, by asset category, are as follows (in millions): Fair Value Measurements at December 31, 2020 December 31, 2019 Total Quoted Prices in Active Markets (Level 1) Significant Observable Inputs Total Quoted Prices in Active Markets (Level 1) Significant Observable Inputs Asset Category Cash and cash equivalents $ 1.2 $ 1.2 $ — $ 1.2 $ 1.2 $ — Fixed income securities U.S. Treasury obligations — — — — — — Domestic corporate bonds and notes — — — — — — Foreign corporate bonds — — — — — — Assets measured at NAV 199.4 — — 189.3 — — Total $ 200.6 $ 1.2 $ — $ 190.5 $ 1.2 $ — The Company’s pension plan assets are held in a master trust and stated at estimated fair value, which is based on the fair values of the underlying investments. Purchases and sales of securities are recorded on a trade-date basis. Interest income is recorded on the accrual basis. Dividends are recorded on the ex-dividend date. Investments in funds that are measured at fair value using the NAV per share practical expedient in accordance with ASC 820 have not been classified in the fair value hierarchy tables above. The NAV is based on the fair value of the underlying assets owned by the fund and is determined by the investment manager or custodian of the fund. The fair value amounts presented are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the fair value of plan assets. These investments primarily include other fixed income investments and securities. Expected Rate-of-Return on Plan Assets: The expected return on plan assets assumption (3.7% for 2020 according to table on assumptions used in plan accounting below) is principally based on the long-term outlook for various asset class returns, asset mix, the historical performance of the plan assets under the liability-driven investment strategy, and a comparison of the estimated long-term return calculated to the distribution of assumptions adopted by other plans with similar asset mixes. For the years ended December 31, 2020 and 2019, the plan assets experienced a positive return of 12.7% and 18.1%, respectively. Accumulated Benefit Obligation for Defined Benefit Pension Plans: For the plans covering employees who are members of collective bargaining units, the benefit formulas are determined according to the collective bargaining agreements, either using career average pay as the base or a flat dollar amount per year of service. In 2007, the Company changed the traditional defined benefit pension plan formula for new non-bargaining unit employees hired after January 1, 2008 and, replaced it with a cash balance defined benefit pension plan formula. Subsequently, effective January 1, 2012, the Company changed the benefits under its traditional defined benefit plans for non-bargaining unit employees hired before January 1, 2008 and, replaced the benefit with the same cash balance defined benefit pension plan formula provided to those employees hired after January 1, 2008. Retirement benefits under the cash balance pension plan formula are based on a fixed percentage of eligible compensation, plus interest. The plan interest credit rate will vary from year-to-year based on the 10-year U.S. Treasury rate. During the year ended December 31, 2019, the Company amended the cash balance pension plan such that, effective January 1, 2020, benefit accruals under the cash balance formula would cease and would be replaced with a non-elective contribution by the Company into a defined contribution plan. All accumulated benefits under the traditional defined benefit pension plan and the cash balance pension plan will remain credited to employees' accounts under the amendments made in 2019. During the year ended December 31, 2020, the Company amended the traditional defined benefit pension plan formula for remaining bargaining unit employees to cease accruals effective January 1, 2021. The accumulated benefit obligation for the Company’s qualified pension plans was $218.7 million and $204.4 million at December 31, 2020 and 2019, respectively. Estimated Benefit Payments: The estimated future benefit payments for the next ten years are as follows (in millions): 2021 2022 2023 2024 2025 2026-2030 Estimated Benefit Payments Pension $ 13.2 $ 13.1 $ 12.9 $ 13.2 $ 12.7 $ 59.5 Post-retirement Benefits 0.8 0.8 0.7 0.7 0.7 3.3 Non-qualified Plan Benefits — 1.2 — — 1.9 — Total estimated benefit payments $ 14.0 $ 15.1 $ 13.6 $ 13.9 $ 15.3 $ 62.8 Estimated Future Contributions: Contributions are determined annually for each plan by the Company’s pension Administrative Committee, based upon the actuarially determined minimum required contribution under the Employee Retirement Income Security Act of 1974, as amended, the Pension Protection Act of 2006, and the maximum deductible contribution allowed for tax purposes. In 2020, 2019 and 2018, the Company made no contributions to its defined benefit pension plans. The Company’s funding policy is to contribute cash to its pension plans so that it meets at least the minimum contribution requirements. Net Benefit Cost Recognized and Amounts Recognized in Other Comprehensive Income: Components of the net periodic benefit cost and other amounts recognized in other comprehensive income (loss) for the defined benefit pension plans and the post-retirement health care and life insurance benefit plans during 2020, 2019, and 2018, are shown below (in millions): Pension Benefits Other Post-retirement Benefits Non-qualified Plan Benefits Components of Net Periodic Benefit Cost 2020 2019 2018 2020 2019 2018 2020 2019 2018 Service cost $ (0.8) $ (2.3) $ (1.8) $ (0.1) $ (0.1) $ (0.1) $ — $ (0.1) $ (0.1) Interest cost (6.5) (8.0) (7.4) (0.3) (0.4) (0.4) (0.1) (0.1) (0.1) Expected return on plan assets 6.8 7.3 8.2 — — — — — — Amortization of net loss (2.5) (4.1) (4.2) 0.1 0.1 (0.3) (0.1) — (0.1) Amortization of prior service cost — 0.6 0.5 — — — — 0.1 0.2 Curtailment gain (loss) — 1.3 — — — — — 0.1 0.6 Settlement gain (loss) — — — — — — — — (0.1) Net periodic benefit cost $ (3.0) $ (5.2) $ (4.7) $ (0.3) $ (0.4) $ (0.8) $ (0.2) $ — $ 0.4 Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Loss) Net gain (loss) $ (3.8) $ 5.2 $ (6.5) $ (3.7) $ 0.3 $ 1.4 $ (0.2) $ (0.2) $ 0.2 Amortization of net loss 1 2.5 4.1 4.2 (0.1) (0.1) 0.3 0.1 — 0.1 Prior service credit — — — — — — — — — Prior service cost (0.1) — — — — — — — — Amortization of prior service credit 1 — (0.6) (0.5) — — — — (0.1) (0.2) Curtailment gain recognition of prior service credit 1 — (1.3) — — — — — (0.1) (0.6) Recognition of settlement loss 1 — — — — — — — — 0.1 Total recognized in Other comprehensive income (loss) (1.4) 7.4 (2.8) (3.8) 0.2 1.7 (0.1) (0.4) (0.4) Total recognized in net periodic benefit cost and Other comprehensive income (loss) $ (4.4) $ 2.2 $ (7.5) $ (4.1) $ (0.2) $ 0.9 $ (0.3) $ (0.4) $ — 1 Represents amortization or recognition of balances previously recorded to Accumulated other comprehensive income (loss) in the consolidated balance sheets and recognized as a component of net periodic benefit cost. Other components of net periodic benefit costs (other than the service cost component) are recorded in Interest and other income (expense), net in the consolidated statements of operations. Amounts recognized on the consolidated balance sheets in accumulated other comprehensive income (loss) at December 31, 2020 and 2019 were as follows (in millions): Pension Benefits Other Post-retirement Benefits Non-qualified Plan Benefits 2020 2019 2020 2019 2020 2019 Net gain (loss), net of taxes $ (48.8) $ (47.4) $ (3.6) $ 0.2 $ (0.8) $ (0.8) Unrecognized prior service credit (cost), net of taxes (0.1) — — — — — Total $ (48.9) $ (47.4) $ (3.6) $ 0.2 $ (0.8) $ (0.8) Unrecognized gains and losses of the post-retirement benefit plans are amortized over 5 years. Although current health costs are expected to increase, the Company attempts to mitigate these increases by maintaining caps on certain of its benefit plans, using lower cost health care plan options where possible, requiring that certain groups of employees pay a portion of their benefit costs, self-insuring for certain insurance plans, encouraging wellness programs for employees, and implementing measures to mitigate future benefit cost increases. Assumptions in Plan Accounting: The weighted average assumptions used to determine benefit information during 2020, 2019, and 2018 were as follows: Pension Benefits Other Post-retirement Benefits Non-qualified Plan Benefits 2020 2019 2018 2020 2019 2018 2020 2019 2018 Weighted Average Assumptions Discount rate 2.40 % 3.29 % 4.33 % 2.49 % 3.38 % 4.38 % 1.07 % 2.48 % 3.78 % Rate of compensation increase N/A 0.5%-3.0% 0.5%-3.0% 0.5%-3.0% 0.5%-3.0% 0.5%-3.0% N/A N/A N/A Expected return on plan assets 3.70 % 4.30 % 4.30 % N/A N/A N/A N/A N/A N/A Interest crediting rates 0.71 % 1.68 % 3.01 % N/A N/A N/A 0.71 % 1.68 % 3.01 % Initial health care cost trend rate N/A N/A N/A 5.70 % 6.00 % 6.20 % N/A N/A N/A Ultimate rate N/A N/A N/A 4.50 % 4.50 % 4.50 % N/A N/A N/A Year ultimate rate is reached N/A N/A N/A 2037 2037 2037 N/A N/A N/A Multiemployer Plans: Grace Pacific and certain subsidiaries contribute to a number of multiemployer defined benefit pension plans under the terms of collective-bargaining agreements that cover their union-represented employees. The risks of participating in these multiemployer plans are different from single-employer plans in the following aspects: a. Assets contributed to the multiemployer plan by one employer may be used to provide benefits to employees of other participating employers. b. If a participating employer stops contributing to the plan, the unfunded obligations of the plan may be borne by the remaining participating employers. c. If the Company chooses to stop participating in some of its multiemployer plans, the Company may be required to pay those plans an amount based on the underfunded status of the plan, referred to as a withdrawal liability. The Company's participation in these plans and the historical activity for the years ended December 31, 2020, 2019 and 2018 are outlined in the table below. Regarding the Hawai‘i Laborers Trust Funds, GPRS and GPRM (as applicable prior the Company's disposal of GPRM in the year ended December 31, 2020) had separate contracts and are presented separately in the table below to reflect the historical contributions by relevant entity. The "EIN Pension Plan Number" column provides the Employee Identification Number (EIN) and the 3-digit plan number, if applicable. The most recent Pension Protection Act ("PPA") zone status is based on the most recent annual report received from the plan for the following plan year ends (as certified by the plan's actuary) : • Pension Trust Fund for Operating Engineers Pension Plan - December 31, 2019 • Laborer's National (Industrial) Pension Fund - December 31, 2019 • Hawai‘i Laborer's Trust Funds - February 29, 2020 The zone status listed for each plan is determined, in part and among other factors, as follows: • Green - plan is funded more than 80%. • Yellow - meets one of the following criteria: (1) plan is funded between 65% and 80% funded or (2) plan has an accumulated funding deficiency or is expected to have a deficiency in any of the next six years. • Orange - Plan meets both of the criteria listed above applicable to the yellow zone. • Red - Plan is less than 65% funded and is in need of reorganization. The "FIP/RP Status Pending/Implemented" column indicates plans for which a financial improvement plan (FIP) or a rehabilitation plan (RP) is either pending or has been implemented and the "Surcharge Imposed" column represents whether the Company has paid a surcharge to the plan as of December 31, 2020. The "Expiration Date" column describes the expiration dates of the collective-bargaining agreements requiring contributions to the plan. FIP/RP Status Contribution by Entity Contribution by Entity Contribution by Entity Surcharge Imposed Expiration Date Fund EIN Pension Plan Number PPA Zone Status Pending/Implemented Jan. 1 - Dec. 31, 2020 Jan. 1 - Dec. 31, 2019 Jan. 1 - Dec. 31, 2018 Operating Engineers 94-6090764; 001 Yellow Yes $ 3.3 $ 4.1 $ 4.7 No 8/31/24 Laborers National 52-6074345; 001 Yellow Yes 0.2 0.2 0.2 No 8/31/21 Hawai‘i Laborers (GPRM) 99-6025107; 001 Green No 0.3 1.1 0.9 No N/A Hawai‘i Laborers (GPRS) 99-6025107; 001 Green No 0.2 0.2 0.2 No 9/30/24 Total $ 4.0 $ 5.6 $ 6.0 As of the end of each respective period, based upon the most recently available annual reports for the applicable plan year, plans reporting that the Company's contributions represented more than 5% of the plan's total contributions for the applicable plan year were as follows: as of December 31, 2020, there were no such plans; as of December 31, 2019, there was one plan (Hawai‘i Laborers Trust Fund); as of December 31, 2018, there were no such plans. A&B Defined Contribution Plans : The Company sponsors defined contribution plans that qualify under Section 401(k) of the Code and provides matching contributions of up to 3% of eligible compensation. The Company’s matching contributions expensed under these plans totaled $0.6 million, $0.2 million and $0.6 million in the years ended December 31, 2020, 2019 and 2018, respectively. The Company also maintains profit sharing plans and, if a minimum threshold of Company performance is achieved, provides contributions of 1% to 5%, depending upon Company performance above the minimum threshold. There were $0.5 million, $0.3 million and $0.4 million of profit sharing contribution expenses recognized in the years ended December 31, 2020, 2019 and 2018, respectively. As noted above, during the year ended December 31, 2019, the Company amended the cash balance pension plan such that, effective January 1, 2020, benefit accruals under the cash balance formula would cease and would be replaced with a non-elective contribution of 3% of the participant's annual eligible compensation made by the Company into the participant's defined contribution plan. The Company's contribution expensed under this non-elective component of the defined contribution plan totaled $0.7 million in 2020 (and none in prior periods). Grace Pacific 401(k) Plans : The Company allows for discretionary non-elective employer contributions up to the sum of 10% of each eligible employee's compensation for the 12 months in the plan year, subject to certain limitations. Management revenue sharing bonuses can be deferred to the employee's 401(k) account, but will be subject to the IRS' annual limit on employee elective deferrals. Grace Pacific recognized discretionary employer contribution and revenue sharing expense of $1.1 million, $1.1 million and $1.8 million in the years ended December 31, 2020, 2019 and 2018, respectively.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Income Taxes	Income TaxesFor taxable years prior to 2017, the Company filed a consolidated federal income tax return, which included all of its wholly owned subsidiaries. On October 15, 2018, the Company filed its 2017 Form 1120-REIT with the Internal Revenue Service. The Company's taxable REIT subsidiary ("TRS") filed separately as a C corporation. The Company also files separate income tax returns in various states. The Company completed the necessary preparatory work and obtained the necessary approvals such that the Company believes it has been organized and operates in a manner that enables it to qualify, and continue to qualify, as a REIT for federal income tax purposes. As a REIT, the Company will generally be allowed a deduction for dividends that it pays, and therefore, will not be subject to United States federal corporate income tax on its taxable income that is currently distributed to shareholders. The Company may be subject to certain state gross income and franchise taxes, as well as taxes on any undistributed income and federal and state corporate taxes on any income earned by its TRS. In addition, the Company could be subject to corporate income taxes related to assets held by the REIT that are sold during the 5-year period following the date of conversion, to the extent such sold assets had a built-in gain as of January 1, 2017. The Company does not intend to dispose of any REIT assets after the REIT conversion within the 5-year period, unless various tax planning strategies, including Code §1031 like-kind exchanges or other deferred tax structures are available to mitigate the built-in gain tax liability of conversion. Distributions with respect to the Company’s common stock can be characterized for federal income tax purposes as ordinary income, capital gains, unrecaptured section 1250 gains, return of capital, or a combination thereof. Taxable distributions paid for the years ended December 31, 2020 and 2019 were classified as ordinary income. Distributions paid for the year ended December 31, 2018 included taxable ordinary income and a non-taxable return of capital. The income tax expense (benefit) on income (loss) from continuing operations for the years ended December 31, 2020, 2019 and 2018 consisted of the following (in millions): 2020 2019 2018 Current: Federal $ (0.1) $ (1.6) $ (0.3) State (0.3) (0.4) — Current $ (0.4) $ (2.0) $ (0.3) Deferred: Federal $ — $ — $ 14.0 State — — 2.6 Deferred $ — $ — $ 16.6 Income tax expense (benefit) $ (0.4) $ (2.0) $ 16.3 Income tax expense (benefit) for the years ended December 31, 2020, 2019, and 2018 differs from amounts computed by applying the statutory federal rate to income from continuing operations before income taxes for the following reasons (in millions): 2020 2019 2018 Computed federal income tax expense $ 1.2 $ (8.2) $ (11.1) State income taxes (1.1) (5.1) (15.6) Valuation allowance 3.4 8.3 84.4 REIT rate differential (4.7) (7.9) (51.5) Amended return — (1.1) 0.6 Noncontrolling interest 0.1 0.5 (0.6) Impairment — 12.4 10.7 Other, net 0.7 (0.9) (0.6) Income tax expense (benefit) $ (0.4) $ (2.0) $ 16.3 The change in the Company's effective tax rate for the year ended December 31, 2020 as compared to the year ended December 31, 2019 is primarily due to impairments incurred in 2019, changes in the valuation allowance on deferred tax assets during the year and overall increase in pretax book income for the year ended December 31, 2020. The tax effects of temporary differences that give rise to significant portions of the deferred tax assets and deferred tax liabilities as of December 31, 2020 and 2019 were as follows (in millions): 2020 2019 Deferred tax assets: Employee benefits $ 11.5 $ 10.4 Capitalized costs 5.5 6.2 Joint ventures and other investments 42.6 49.1 Impairment and amortization 1.6 0.9 Solar investment benefits 15.7 16.7 Insurance and other reserves 6.4 3.2 Disallowed interest expense 9.1 8.4 Net operating losses 20.5 17.6 Operating lease liability 2.0 2.6 Other 3.2 3.4 Total deferred tax assets $ 118.1 $ 118.5 Valuation allowance (104.0) (99.3) Total net deferred tax assets $ 14.1 $ 19.2 Deferred tax liabilities: Property (including tax-deferred gains on real estate transactions) $ 12.2 $ 16.0 Operating lease asset 1.9 2.5 Other — 0.7 Total deferred tax liabilities $ 14.1 $ 19.2 Net deferred tax assets (liabilities) $ — $ — Federal tax credit carryforwards at December 31, 2020 totaled $8.7 million and will expire in 2036. State tax credit carryforwards at December 31, 2020 totaled $6.9 million and may be carried forward indefinitely under state law. As of December 31, 2020, the Company had gross federal net operating loss carryforwards of $74.9 million ($15.7 million tax-effected), of which $11.5 million ($2.4 million tax-effected) will expire in 2037, with the remaining being carried forward indefinitely under federal law. As of December 31, 2020, the Company had state net operating loss carryforwards of $94.3 million ($4.8 million tax-effected), of which $21.6 million ($1.1 million tax-effected) of Hawai‘i net operating loss carryforwards will expire in 2037, and the remaining being carried forward indefinitely. A valuation allowance must be provided if it is more likely than not that some portion or all of the deferred tax assets will not be realized, based upon consideration of all positive and negative evidence. Sources of evidence include, among other things, a history of pretax earnings or losses, expectations of future results, tax planning opportunities and appropriate tax law. Due to the recent losses the Company has generated in its TRS, the Company believes that it is more likely than not that its U.S. and state deferred tax assets will not be realized as of December 31, 2020. Therefore, the Company recorded an increase in the valuation allowance of $4.7 million on its net U.S. and state deferred tax assets for the current period. Should the Company determine that it would be able to realize its deferred tax assets in the foreseeable future, an adjustment to the deferred tax assets may cause a material increase to income in the period such determination is made. Significant management judgment is required in determining the period in which reversal of a valuation allowance should occur. The net change to the valuation allowance recorded during the years ended December 31, 2020, 2019 and 2018 were as follows (in millions): Balance at Beginning of Year Net Change Balance at End of Year 2020 $ 99.3 $ 4.7 $ 104.0 2019 $ 91.5 $ 7.8 $ 99.3 2018 $ 6.9 $ 84.6 $ 91.5 The Company receives an income tax benefit for exercised stock options calculated as the difference between the fair market value of the stock issued at the time of exercise and the option exercise price, tax-effected. The Company also receives an income tax benefit for restricted stock units when they vest, measured as the fair market value of the stock issued at the time of vesting, tax effected. Due to the Company's valuation allowance in the respective periods, there were no net tax benefits recognized from share-based transactions for 2020, 2019 or 2018. The Company recognizes accrued interest and penalties on income taxes as a component of income tax expense. As of December 31, 2020, accrued interest and penalties were not material. The Company has not identified any material unrecognized tax positions and as such has no related interest or penalty accruals. As of December 31, 2020, tax years 2017 and later are open to audit by the tax authorities. The Company does not believe that the result of any potential audits will have a material adverse effect on its results of operations, financial condition or liquidity. In response to the COVID-19 pandemic, the Coronavirus Aid, Relief, and Economic Security Act (“CARES Act”) was signed into law on March 27, 2020, providing companies with various tax relief provisions and other stimulus measures. Such measures include, but are not limited to, temporary changes regarding the prior and future utilization of net operating losses, technical corrections to prior tax legislation for tax depreciation of certain qualified improvement property, acceleration of AMT credit refunds, and changes to business interest limitations. The Consolidated Appropriations Act was also signed into law on December 27, 2020 to provide further relief measures and renew various expiring tax provisions. Additionally, the IRS issued final regulations and proposed regulations on calculating the limitation on business interest expense, the allowance for the first-year depreciation deduction under Code Section 168(k), as amended by the Tax Cuts and Jobs Act, for qualified property acquired and placed in service after September 27, 2017, and meals and entertainment deductions. Based on the Company's evaluation, these regulations did not have a material impact on the income tax provision for the years ended December 31, 2020 and 2019.

Earnings Per Share (_EPS_)

Earnings Per Share (“EPS”)	12 Months Ended
	Dec. 31, 2020
Earnings Per Share [Abstract]
Earnings Per Share (“EPS”)	Earnings Per Share ("EPS") Basic earnings per common share excludes dilution and is calculated by dividing net earnings allocated to common shares by the weighted-average number of common shares outstanding for the period. Diluted earnings per common share is calculated by dividing net earnings allocated to common shares by the weighted-average number of common shares outstanding for the period, as adjusted for the potential dilutive effect of non-participating share-based awards, as well as adjusted by the number of additional shares, if any, that would have been outstanding had the potentially dilutive common shares been issued. The following table provides a reconciliation of income (loss) from continuing operations to income (loss) from continuing operations available to A&B shareholders and net income (loss) available to A&B shareholders for the years ended December 31, 2020, 2019 and 2018 (in millions): 2020 2019 2018 Income (loss) from continuing operations $ 6.0 $ (36.9) $ (69.2) Exclude: (Income) loss attributable to noncontrolling interest 0.4 2.0 (2.2) Income (loss) from continuing operations attributable to A&B shareholders 6.4 (34.9) (71.4) Exclude: (Increase) decrease in carrying value of redeemable non-controlling interest — — — Income (loss) from continuing operations available to A&B shareholders 6.4 (34.9) (71.4) Distributions and allocations to participating securities (0.1) (0.2) — Income (loss) from continuing operations available to A&B common shareholders 6.3 (35.1) (71.4) Income (loss) from discontinued operations available to A&B common shareholders (0.8) (1.5) (0.6) Net income (loss) available to A&B common shareholders $ 5.5 $ (36.6) $ (72.0) The number of shares used to compute basic and diluted earnings per share for the years ended December 31, 2020, 2019 and 2018 were as follows (in millions): 2020 2019 2018 Denominator for basic EPS - weighted average shares outstanding 72.3 72.2 70.6 Effect of dilutive securities: Stock options and restricted stock unit awards 0.1 — — Special Distribution — — — Denominator for diluted EPS - weighted average shares outstanding 72.4 72.2 70.6 There were 0.3 million and 0.2 million shares of anti-dilutive securities outstanding during the year ended December 31, 2020 and December 31, 2019, respectively. There were no shares of anti-dilutive securities outstanding during the year ended December 31, 2018.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	12 Months Ended
	Dec. 31, 2020
Equity [Abstract]
Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) Other comprehensive income (loss) principally includes amortization of deferred pension and postretirement costs. The components of accumulated other comprehensive loss, net of taxes, were as follows for the years ended December 31, 2020 and 2019 (in millions): 2020 2019 Employee benefit plans: Pension plans $ (48.9) $ (47.4) Post-retirement plans (3.6) 0.2 Non-qualified benefit plans (0.8) (0.8) Total employee benefit plans (53.3) (48.0) Interest rate swap (6.7) (0.8) Accumulated other comprehensive income (loss) $ (60.0) $ (48.8) The changes in accumulated other comprehensive income (loss) by component for the years ended December 31, 2020, 2019 and 2018 were as follows (in millions, net of tax): Employee Benefit Plans Interest Rate Swap Total Balance, January 1, 2018 $ (44.2) $ 1.9 $ (42.3) Other comprehensive income (loss) before reclassifications, net of taxes of $0 (4.9) 1.0 (3.9) Amounts reclassified from accumulated other comprehensive income (loss), net of taxes of $0 3.4 — 3.4 Impact of adoption of ASU 2018-02 (9.5) 0.4 (9.1) Balance, December 31, 2018 $ (55.2) $ 3.3 $ (51.9) Other comprehensive income (loss) before reclassifications, net of taxes of $0 5.3 (4.0) 1.3 Amounts reclassified from accumulated other comprehensive income (loss), net of taxes of $0 1.9 (0.1) 1.8 Balance, December 31, 2019 $ (48.0) $ (0.8) $ (48.8) Other comprehensive income (loss) before reclassifications, net of taxes of $0 (7.7) (6.9) (14.6) Amounts reclassified from accumulated other comprehensive income (loss), net of taxes of $0 2.4 1.0 3.4 Balance, December 31, 2020 $ (53.3) $ (6.7) $ (60.0) The reclassifications of other comprehensive income (loss) components out of accumulated other comprehensive income (loss) for the years ended December 31, 2020, 2019 and 2018 were as follows (in millions): 2020 2019 2018 Unrealized interest rate hedging gain (loss) $ (6.9) $ (4.0) $ 1.0 Actuarial loss (7.7) 5.3 (4.9) Impact of reclassification adjustment to interest expense included in Net Income (Loss) 1.0 (0.1) — Amortization of defined benefit pension items reclassified to net periodic pension cost: Net loss* 2.5 4.0 4.6 Prior service cost* (0.1) — — Prior service credit* — (0.7) (0.7) Curtailment (gain)/loss* — (1.4) (0.6) Settlement (gain)/loss* — — 0.1 Total before income tax $ (11.2) $ 3.1 $ (0.5) Income taxes — — — Other comprehensive income (loss), net of tax $ (11.2) $ 3.1 $ (0.5) * This accumulated other comprehensive income (loss) component is included in the computation of net periodic pension cost (refer to Note 17).

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2020
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions Construction Contracts and Material Sales. The Company enters into contracts in the ordinary course of business, as a supplier, with affiliate entities that require accounting under the equity method due to the Company's financial interests in such entities (refer to Note 5) and also with affiliate parties that are members in entities in which the Company also is a member and holds a controlling financial interest. Related to the periods during which such relationship existed, revenues earned from transactions with such affiliates were $7.4 million, $10.5 million, and $16.6 million for the years ended December 31, 2020, 2019 and 2018, respectively. Expenses recognized from transactions with such affiliates were $1.1 million, $3.1 million and less than $0.1 million for the years ended December 31, 2020, 2019 and 2018 Receivables from these affiliates were $0.9 million and $0.2 million at December 31, 2020 and December 31, 2019, respectively. Amounts due to these affiliates were $0.3 million and $1.2 million as of December 31, 2020 and 2019, respectively. Commercial Real Estate. The Company entered into contracts in the ordinary course of business, as a lessor of property, with certain entities that were partially owned by a former director of the Company, as lessee. Revenue from transactions with these entities (confined to periods during which the former director was actively serving the Company) was approximately $1.3 million and $4.3 million for the years ended December 31, 2019 and 2018, respectively. There were no such amounts to report during the year ended December 31, 2020 (i.e., subsequent to the former director's service to the Company). Land Operations. During the years ended December 31, 2020, 2019 and 2018, the Company recognized $3.1 million, $2.2 million and $1.1 million, respectively, related to revenue for materials and services provided to certain unconsolidated investments in affiliates and interest earned on notes receivables from such related parties. Receivables from service arrangements with these affiliates were less than $0.1 million as of December 31, 2020 and 2019. Notes receivable from related parties were held at carrying values of $9.5 million and $13.1 million as of December 31, 2020 and 2019, respectively, related to a construction loan secured by a mortgage on real property with one of the Company's joint ventures. During the year ended December 31, 2018, the Company completed the acquisition of five commercial units at The Collection high-rise residential condominium project on Oahu from its joint venture partners for $6.9 million paid in cash.

Segment Results

Segment Results	12 Months Ended
	Dec. 31, 2020
Segment Reporting [Abstract]
Segment Results	Segment Results Operating segments are components of an enterprise that engage in business activities from which it may earn revenues and incur expenses, whose operating results are regularly reviewed by the chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and for which discrete financial information is available. The Company operates and reports on three segments: Commercial Real Estate; Land Operations; and Materials & Construction. The Commercial Real Estate segment owns, operates and manages a portfolio of retail, industrial and office properties in Hawai‘i totaling 3.9 million square feet of gross leasable area. The Company also leases approximately 153.8 acres of commercial land in Hawai‘i to third-party lessees under ground leases. The Land Operations segment generates its revenues from real estate development and land sales, income/loss from real estate joint ventures, hydroelectric energy and other legacy business activities in Hawai‘i. The Materials & Construction segment performs asphalt paving as prime contractor and subcontractor; imports and sells liquid asphalt; mines, processes and sells rock and sand aggregates; produces and sells asphaltic concrete; provides and sells various construction- and traffic-control-related products and, historically, manufactured and sold precast concrete products through GPRM (until GPRM's disposal in the year ended December 31, 2020). The accounting policies of the operating segments are described in Note 2. Reportable segments are measured based on operating profit, exclusive of interest expense, general corporate expenses and income taxes. Revenues related to transactions between reportable segments have been eliminated in consolidation. Transactions between reportable segments are accounted for on the same basis as transactions with unrelated third parties. A significant portion of Materials & Construction revenue and accounts receivable is generated directly and indirectly from projects administered by the City and County of Honolulu and from the State of Hawai‘i. Reductions in funding of infrastructure projects by these government agencies could reduce revenue and profits from the M&C segment. Further, although the customer mix of real estate sales in our Land Operations segment may be diverse in any given period, during the years ended December 31, 2018 and December 31, 2019, the Land Operations segment recognized gross profits of $162.2 million and $6.7 million, respectively, from the Agricultural Land Sale to Mahi Pono. Operating segment information for the years ended December 31, 2020, 2019 and 2018 is summarized below (in millions): 2020 2019 2018 Operating Revenue: Commercial Real Estate $ 150.0 $ 160.6 $ 140.3 Land Operations 40.6 114.1 289.5 Materials & Construction 114.7 160.5 214.6 Total operating revenue 305.3 435.2 644.4 Operating Profit (Loss): Commercial Real Estate 1 49.8 66.2 58.5 Land Operations 2 17.3 20.8 (26.7) Materials & Construction 3 (12.4) (69.2) (73.2) Total operating profit (loss) 54.7 17.8 (41.4) Gain (loss) on disposal of commercial real estate properties, net 0.5 — 51.4 Interest expense (30.3) (33.1) (35.3) General corporate expenses (19.3) (23.6) (27.6) Income (Loss) from Continuing Operations Before Income Taxes $ 5.6 $ (38.9) $ (52.9) Identifiable Assets: Commercial Real Estate $ 1,499.9 $ 1,532.6 $ 1,530.4 Land Operations 4 258.4 282.5 350.0 Materials & Construction 211.9 243.0 297.1 Other 65.8 26.2 47.7 Total assets $ 2,036.0 $ 2,084.3 $ 2,225.2 Capital Expenditures: Commercial Real Estate 5 $ 18.8 $ 250.5 $ 282.7 Land Operations 6 1.4 2.3 1.4 Materials & Construction 4.5 1.9 11.0 Other 0.4 0.4 1.0 Total capital expenditures $ 25.1 $ 255.1 $ 296.1 Depreciation and Amortization: Commercial Real Estate $ 40.1 $ 36.7 $ 28.0 Land Operations 1.5 1.6 1.9 Materials & Construction 10.8 11.4 12.1 Other 0.9 0.8 0.8 Total depreciation and amortization $ 53.3 $ 50.5 $ 42.8 1 Commercial Real Estate segment operating profit (loss) includes intersegment operating revenue, primarily from the Materials & Construction segment, and is eliminated in the consolidated results of operations. 2 Land Operations segment operating profit (loss) includes equity in earnings (losses) from the Company's various real estate joint ventures and non-cash reductions related to the Company's solar tax equity investments. The year ended December 31, 2018 also includes a non-cash, other-than-temporary impairment of $186.8 million recorded against the Company's investment in Kukui‘ula. 3 Materials & Construction segment operating profit (loss) for the year ended December 31, 2020 includes an impairment charge of $5.6 million related to its disposal of GPRM. Materials & Construction segment operating profit (loss) for the December 31, 2019 includes an impairment charge related to its goodwill of $49.7 million. Materials & Construction segment operating profit (loss) for the December 31, 2018 includes cumulative impairment charges related to long-lived assets, finite-lived intangible assets and goodwill of $77.8 million. 4 The Land Operations segment includes assets related to its investment in various real estate joint ventures. 5 Represents gross capital additions to the commercial real estate portfolio, including gross tax deferred property purchases but excluding the assumption of debt, that are reflected as non-cash transactions in the consolidated statements of cash flows. 6 Excludes expenditures for real estate developments held for sale, which are classified as cash flows from operating activities within the consolidated statements of cash flows, and excludes investment in joint ventures classified as cash flows from investing activities.

Agricultural Land Sale

Agricultural Land Sale	12 Months Ended
	Dec. 31, 2020
Discontinued Operations and Disposal Groups [Abstract]
Agricultural Land Sale	Agricultural Land Sale On December 17, 2018, A&B entered into a Purchase and Sale Agreement and Escrow Instructions (the "PSA") with Mahi Pono (the "Buyer") related to the Agricultural Land Sale, which resulted in the sale of approximately 41,000 acres of Maui agricultural land and 100% of the Company's ownership interest in Central Maui Feedstocks LLC and Kulolio Ranch LLC in exchange for cash consideration of approximately $261.6 million, less customary closing costs and fees, subject to certain contingencies and reserves of approximately $19.5 million. The Agricultural Land Sale closed on December 20, 2018, with the exception of approximately 800 acres that were delivered to the Buyer in February 2019. In connection with the Agricultural Land Sale, the Company recognized gross profit of approximately $162.2 million during the year ended December 31, 2018, and $6.7 million during the year ended December 31, 2019. The Company also deferred approximately $62.0 million of revenue related to certain performance obligations involving securing adequate water to support the Buyer's agricultural plans for the land, through an agreement with the State of Hawai‘i to provide rights to access state water for agricultural irrigation (“State Water Lease”), as well as ensuring that the Buyer has continued access to water prior to the issuance of the State Water Lease. Under the terms of the PSA, the Company may be required to remit amounts up to $62.0 million to the Buyer to the extent performance obligations are not met (recorded as deferred revenue of $62.0 million as of December 31, 2020 and 2019). The Agricultural Land Sale was deemed an asset sale and represents normal recurring activity for the Land Operations segment. Revenue and the cost of the land sold were presented within Operating Revenue: Land Operations and Cost of Land Operations, respectively, in the accompanying consolidated statements of operations. The disposition of the Agricultural Land Sale did not qualify to be reported as discontinued operations since the disposition did not represent a strategic shift in the Company’s operations. Accordingly, the operating results of the assets are reflected in the Company’s results from continuing operations for all periods presented through the date of disposition. 2018 impairments of assets held and used During the fourth quarter of 2018, the Company concluded that the carrying values of certain paving and quarry assets in its Materials & Construction segment were not recoverable due primarily to persisting, competitive market pressures that have negatively affected sales and margins. As a result, the Company recorded impairment charges of $40.6 million during the fourth quarter of 2018 to reduce the carrying amounts to the estimated fair value. The Company classified these fair value measurements as Level 3. The weighted average discount rate used in the intangible valuation was 13.5%. Changes to Materials & Construction fixed assets and intangible assets for the year ended December 31, 2018 including such impairments were as follows (in millions): Intangible Assets Materials & Construction Fixed Assets Materials & Construction Balance, January 1, 2018 $ 16.5 Balance, January 1, 2018 $ 139.5 Additions to intangible assets — Additions to fixed assets 11.1 Amortization (0.9) Depreciation (11.2) Intangible impairment (7.0) Fixed asset impairment (33.6) Balance, December 31, 2018 $ 8.6 Balance, December 31, 2018 $ 105.8 Port Allen solar power facility asset sale As described in Item 2, the Company, through its wholly-owned subsidiary, McBryde Resources, Inc., has produced renewable energy through hydroelectric and solar power facilities on Kauai. Energy generated from these hydroelectric and solar power facilities has been used for A&B-related operations or sold to Kauai Island Utility Cooperative. Such activities are included and reported in the Land Operations segment. In connection with its strategy to simplify its business, during the quarter ended September 30, 2020, the Company executed a purchase and sale agreement and consummated the sale of assets related to its solar power facility in Port Allen on Kauai for purchase consideration (measured at the date of disposal) of approximately $17.1 million. As a result, the Company derecognized the carrying value of the net assets of the disposal group and recorded a gain on disposal of approximately $8.9 million which is included in Gain (loss) on disposal of non-core assets, net in the consolidated statements of operations. The disposal was not considered individually significant and does not qualify for presentation and disclosure as a discontinued operation. GPRM sale of subsidiary As described in Note 1, as of December 31, 2019, the Company owned a 51% interest in GPRM, a provider of precast/prestressed concrete products and services, which the Company consolidated due to holding a controlling financial interest through its majority voting interests and reported as part of the M&C segment. Subsequent to the quarter ended March 31, 2020, GPRM met the criteria to be classified as held for sale. As a result, in the quarter ended June 30, 2020, the Company recorded a write-down of $5.6 million (based on fair value less cost to sell) related to the disposal group which was included in Impairment of assets in the consolidated statements of operations. On June 29, 2020, the Company consummated the sale of its 51% ownership interest in GPRM to an unrelated third-party through an LLC interest purchase agreement in exchange for cash proceeds received/to be received of approximately $5.0 million. In connection with the consummation of the disposal of GPRM, the Company recorded an entry to deconsolidate the carrying amounts of the GPRM disposal group and recognized a net loss of $0.1 million, which was included in Gain (loss) on disposal of non-core assets, net in the consolidated statements of operations. The GPRM disposal was not considered individually significant and does not qualify for presentation and disclosure as a discontinued operation. Subsequent to the disposal of GPRM, the Company's goodwill balance was $10.5 million as of December 31, 2020, of which $8.7 million relates to the Commercial Real Estate segment and the remainder relates to GPRS.

Long-lived Assets - Impairments

Long-lived Assets - Impairments, Held for Sale or Disposals	12 Months Ended
	Dec. 31, 2020
Discontinued Operations and Disposal Groups [Abstract]
Long-lived Assets - Impairments, Held for Sale or Disposals	Agricultural Land Sale On December 17, 2018, A&B entered into a Purchase and Sale Agreement and Escrow Instructions (the "PSA") with Mahi Pono (the "Buyer") related to the Agricultural Land Sale, which resulted in the sale of approximately 41,000 acres of Maui agricultural land and 100% of the Company's ownership interest in Central Maui Feedstocks LLC and Kulolio Ranch LLC in exchange for cash consideration of approximately $261.6 million, less customary closing costs and fees, subject to certain contingencies and reserves of approximately $19.5 million. The Agricultural Land Sale closed on December 20, 2018, with the exception of approximately 800 acres that were delivered to the Buyer in February 2019. In connection with the Agricultural Land Sale, the Company recognized gross profit of approximately $162.2 million during the year ended December 31, 2018, and $6.7 million during the year ended December 31, 2019. The Company also deferred approximately $62.0 million of revenue related to certain performance obligations involving securing adequate water to support the Buyer's agricultural plans for the land, through an agreement with the State of Hawai‘i to provide rights to access state water for agricultural irrigation (“State Water Lease”), as well as ensuring that the Buyer has continued access to water prior to the issuance of the State Water Lease. Under the terms of the PSA, the Company may be required to remit amounts up to $62.0 million to the Buyer to the extent performance obligations are not met (recorded as deferred revenue of $62.0 million as of December 31, 2020 and 2019). The Agricultural Land Sale was deemed an asset sale and represents normal recurring activity for the Land Operations segment. Revenue and the cost of the land sold were presented within Operating Revenue: Land Operations and Cost of Land Operations, respectively, in the accompanying consolidated statements of operations. The disposition of the Agricultural Land Sale did not qualify to be reported as discontinued operations since the disposition did not represent a strategic shift in the Company’s operations. Accordingly, the operating results of the assets are reflected in the Company’s results from continuing operations for all periods presented through the date of disposition. 2018 impairments of assets held and used During the fourth quarter of 2018, the Company concluded that the carrying values of certain paving and quarry assets in its Materials & Construction segment were not recoverable due primarily to persisting, competitive market pressures that have negatively affected sales and margins. As a result, the Company recorded impairment charges of $40.6 million during the fourth quarter of 2018 to reduce the carrying amounts to the estimated fair value. The Company classified these fair value measurements as Level 3. The weighted average discount rate used in the intangible valuation was 13.5%. Changes to Materials & Construction fixed assets and intangible assets for the year ended December 31, 2018 including such impairments were as follows (in millions): Intangible Assets Materials & Construction Fixed Assets Materials & Construction Balance, January 1, 2018 $ 16.5 Balance, January 1, 2018 $ 139.5 Additions to intangible assets — Additions to fixed assets 11.1 Amortization (0.9) Depreciation (11.2) Intangible impairment (7.0) Fixed asset impairment (33.6) Balance, December 31, 2018 $ 8.6 Balance, December 31, 2018 $ 105.8 Port Allen solar power facility asset sale As described in Item 2, the Company, through its wholly-owned subsidiary, McBryde Resources, Inc., has produced renewable energy through hydroelectric and solar power facilities on Kauai. Energy generated from these hydroelectric and solar power facilities has been used for A&B-related operations or sold to Kauai Island Utility Cooperative. Such activities are included and reported in the Land Operations segment. In connection with its strategy to simplify its business, during the quarter ended September 30, 2020, the Company executed a purchase and sale agreement and consummated the sale of assets related to its solar power facility in Port Allen on Kauai for purchase consideration (measured at the date of disposal) of approximately $17.1 million. As a result, the Company derecognized the carrying value of the net assets of the disposal group and recorded a gain on disposal of approximately $8.9 million which is included in Gain (loss) on disposal of non-core assets, net in the consolidated statements of operations. The disposal was not considered individually significant and does not qualify for presentation and disclosure as a discontinued operation. GPRM sale of subsidiary As described in Note 1, as of December 31, 2019, the Company owned a 51% interest in GPRM, a provider of precast/prestressed concrete products and services, which the Company consolidated due to holding a controlling financial interest through its majority voting interests and reported as part of the M&C segment. Subsequent to the quarter ended March 31, 2020, GPRM met the criteria to be classified as held for sale. As a result, in the quarter ended June 30, 2020, the Company recorded a write-down of $5.6 million (based on fair value less cost to sell) related to the disposal group which was included in Impairment of assets in the consolidated statements of operations. On June 29, 2020, the Company consummated the sale of its 51% ownership interest in GPRM to an unrelated third-party through an LLC interest purchase agreement in exchange for cash proceeds received/to be received of approximately $5.0 million. In connection with the consummation of the disposal of GPRM, the Company recorded an entry to deconsolidate the carrying amounts of the GPRM disposal group and recognized a net loss of $0.1 million, which was included in Gain (loss) on disposal of non-core assets, net in the consolidated statements of operations. The GPRM disposal was not considered individually significant and does not qualify for presentation and disclosure as a discontinued operation. Subsequent to the disposal of GPRM, the Company's goodwill balance was $10.5 million as of December 31, 2020, of which $8.7 million relates to the Commercial Real Estate segment and the remainder relates to GPRS.

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2020
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On February 23, 2021, the Company's Board of Directors declared a cash dividend of $0.15 per share of outstanding common stock, payable on April 2, 2021 to shareholders of record as of the close of business on March 18, 2021.

Schedule III - Real Estate and

Schedule III - Real Estate and Accumulated Depreciation	12 Months Ended
	Dec. 31, 2020
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation Disclosure [Abstract]
Schedule III - Real Estate and Accumulated Depreciation	SCHEDULE III – REAL ESTATE AND ACCUMULATED DEPRECIATION Alexander & Baldwin, Inc. December 31, 2020 (in millions) Initial Cost Costs Capitalized Subsequent to Acquisition Gross Amounts of Which Carried at Close of Period Description Encum- Land Buildings Improvements Carrying Costs Land Buildings Total (2) Accumulated Date of Date Commercial Real Estate Segment Industrial : Kapolei Enterprise Center (HI) $ — $ 7.9 $ 16.8 $ 0.8 $ — $ 7.9 $ 17.5 $ 25.4 $ (1.0) 2019 2019 Harbor Industrial (HI) — — — 1.3 — — 1.3 1.3 (1.1) 1930 2018 Honokohau Industrial (HI) — 5.0 4.8 0.1 — 5.0 4.9 9.9 (0.5) Various 2017 Kailua Industrial/Other (HI) — 10.5 2.0 0.6 — 10.5 2.6 13.1 (0.5) Various 2013 Kakaako Commerce Center (HI) — 16.9 20.6 1.9 — 16.9 22.5 39.4 (3.4) 1969 2014 Komohana Industrial Park (HI) — 25.2 10.8 1.7 — 25.2 12.4 37.6 (3.3) 1990 2010 Opule Industrial (HI) — 10.9 27.1 — — 10.9 27.1 38.0 (1.4) 2005-2006, 2018 2018 P&L Warehouse (HI) — — — 1.3 — — 1.3 1.3 (0.8) 1970 1970 Port Allen (HI) — — 0.7 2.4 — — 3.1 3.1 (2.3) 1983, 1993 1983-1993 Waipio Industrial (HI) — 19.6 7.7 0.7 — 19.7 8.4 28.1 (2.5) 1988-1989 2009 Office : Kahului Office Building (HI) — 1.0 0.4 7.7 — 1.0 8.1 9.1 (8.8) 1974 1989 Kahului Office Center (HI) — — — 5.3 — — 5.3 5.3 (3.9) 1991 1991 Lono Center (HI) — — 1.4 1.3 — — 2.7 2.7 (1.7) 1973 1991 Gateway at Mililani Mauka South (HI) — 7.0 3.5 6.8 — 5.5 10.3 15.8 (1.6) 1992, 2006 2012 Retail : Aikahi Park Shopping Center (HI) — 23.5 6.7 5.9 — 23.5 12.6 36.1 (2.5) 1971 2015 Gateway at Mililani Mauka (HI) — 7.3 4.7 6.1 — 7.7 10.8 18.5 (2.1) 2008, 2013 2011 Hokulei Street (HI) — 16.9 36.5 2.7 — 16.9 39.2 56.1 (3.6) 2015 2018 Kahului Shopping Center (HI) — — — 2.8 — 0.6 2.8 3.4 (1.7) 1951 1951 Kailua Retail Other (HI) 14.3 85.1 73.8 16.1 — 86.1 89.9 176.0 (17.8) Various 2013 Kaneohe Bay Shopping Ctr. (HI) — — 13.4 2.4 — 0.9 15.8 16.7 (7.7) 1971 2001 Kunia Shopping Center (HI) — 2.7 10.6 2.0 — 3.0 12.6 15.6 (5.6) 2004 2002 Lanihau Marketplace (HI) — 9.4 13.2 2.4 — 9.4 15.6 25.0 (4.8) 1987 2010 Laulani Village (HI) 61.3 43.4 64.3 3.0 — 43.4 67.4 110.8 (6.0) 2012 2018 Manoa Marketplace (HI) 57.9 43.3 35.9 3.6 — 45.1 39.5 84.6 (5.7) 1977 2016 Napili Plaza (HI) — 9.4 8.0 1.1 — 9.4 9.1 18.5 (2.3) 1991 2003, 2013 Pearl Highlands Center (HI) 81.4 43.4 96.2 13.5 — 43.5 109.7 153.2 (23.9) 1992-1994 2013 Port Allen Marina Ctr. (HI) — — 3.4 2.0 — — 5.3 5.3 (3.3) 2002 1971 The Collection (HI) — 0.4 2.2 0.8 — 0.4 3.0 3.4 (0.2) 2017 2018 The Shops at Kukui'ula (HI) — 8.9 30.1 4.1 — 9.2 34.2 43.4 (7.6) 2009 2013 Waianae Mall (HI) — 17.4 10.1 5.2 — 17.7 15.3 33.0 (3.7) 1975 2013 Waipio Shopping Center (HI) — 24.0 7.6 1.7 — 24.3 9.3 33.6 (2.6) 1986, 2004 2009 Lau Hala Shops (HI) — — — 23.2 — 14.7 23.2 37.9 (2.2) 2018 2018 Ho'okele (HI) — — — 17.5 — 13.5 17.5 31.0 (1.3) 2017 2019 Puunene Shopping Center (HI) — 24.8 28.6 7.1 — 24.8 35.7 60.5 (3.9) 2017 2018 Queens' Marketplace (HI) — 20.4 58.9 1.5 — 20.4 60.4 80.8 (3.0) 2007 2019 Waipouli Town Center (HI) — 5.9 9.7 0.9 — 5.9 10.6 16.5 (0.6) 1980 2019 Other : Oahu Ground Leases (HI) — 230.5 0.1 (0.1) — 230.7 — 230.7 — — — Other miscellaneous investments — 2.5 0.1 9.7 — 2.8 9.8 12.6 (7.0) — — Total $ 214.9 $ 723.2 $ 609.9 $ 167.1 $ — $ 756.5 $ 776.8 $ 1,533.3 $ (151.9) Description (amounts in millions) Encum- Land Buildings and Improvements Improvements Carrying Costs Land Buildings and Improvements Total (2) Accumulated Land Operations Segment Agricultural Land $ — $ 11.3 $ — $ 0.9 $ — $ 11.3 $ 0.9 $ 12.2 $ (0.5) Kahala Portfolio — — — — — — — — — Kamalani — — — 5.1 — — 5.1 5.1 — Kauai Landholdings — — 0.1 2.5 — — 2.6 2.6 (0.8) Maui Business Park II — — — 33.0 — — 33.0 33.0 — Maui Landholdings — 0.1 0.2 6.2 — 0.1 6.4 6.5 (0.7) Wailea B-1 — 4.6 — — — 4.6 — 4.6 — Wailea, other — 19.9 — 8.5 (0.5) 17.3 8.0 25.3 — Other miscellaneous investments — 2.0 — 0.9 — 1.9 0.9 2.8 (0.5) Total $ — $ 37.9 $ 0.3 $ 57.1 $ (0.5) $ 35.2 $ 56.9 $ 92.1 $ (2.5) (1) See Note 10 to the consolidated financial statements. (2) The aggregate tax basis, at December 31, 2020, for the Commercial Real Estate segment and Land Operations segment assets was approximately $703.2 million. (3) Depreciation is computed based upon the following estimated useful lives: Building and improvements: 10 – 40 years Leasehold improvements: 5 – 10 years (lesser of useful life or lease term) Other property improvements: 3 – 35 years Reconciliation of Real Estate (in millions) 2020 2019 2018 Balance at beginning of year $ 1,619.3 $ 1,447.7 $ 1,325.1 Additions and improvements 20.4 232.8 317.8 Dispositions, retirements and other adjustments (14.3) (61.2) (194.7) Impairment of assets — — (0.5) Balance at end of year $ 1,625.4 $ 1,619.3 $ 1,447.7 Reconciliation of Accumulated Depreciation (in millions) 2020 2019 2018 Balance at beginning of year $ 127.5 $ 107.6 $ 133.5 Depreciation expense 27.4 24.3 20.4 Dispositions, retirements and other adjustments (0.5) (4.4) (46.3) Balance at end of year $ 154.4 $ 127.5 $ 107.6

Significant Accounting Polici_2

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2020
Accounting Policies [Abstract]
Basis of Presentation, Principles of Consolidation and Rounding	Basis of Presentation and Principles of Consolidation: The Company presents its financial statements in accordance with accounting principles generally accepted in the United States ("GAAP") as outlined in the Financial Accounting Standard Board ("FASB") Accounting Standards Codification (the "Codification" or "ASC"). The Codification is the single source of authoritative accounting principles applied by nongovernmental entities in the preparation of financial statements in conformity with GAAP. Rounding: Amounts in the 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.
Use of Estimates	Use of Estimates: The preparation of the consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported. Estimates and assumptions are used for, but not limited to: (i) asset impairments, including intangible assets and goodwill, (ii) litigation and contingencies, (iii) revenue recognition for long-term real estate developments and construction contracts, (iv) pension and postretirement estimates, and (v) income taxes. Future results could be materially affected if actual results differ from these estimates and assumptions.
Customer Concentration	Customer Concentration: A significant portion of Materials & Construction revenue and accounts receivable is generated directly and indirectly from projects administered by the City and County of Honolulu and from the State of Hawai‘i. Reductions in funding of infrastructure projects by these government agencies could reduce revenue and profits from the M&C segment. Further, although the customer mix of real estate sales in our Land Operations segment may be diverse in any given period, during the years ended December 31, 2018 and December 31, 2019, the Land Operations segment recognized gross profits of $162.2 million and $6.7 million, respectively, in connection with the sale of approximately 41,000 acres of Maui agricultural land and 100% of the Company's ownership interest in Central Maui Feedstocks LLC and Kulolio Ranch LLC (collectively referred to as the "Agricultural Land Sale").
Reclassification	Reclassifications: Certain amounts presented in the prior year have been reclassified to conform to the current year presentation (e.g., captions previously presented in the prior years that, in the currently presented periods, are less than five percent of total assets or total liabilities were combined in the current year consolidated balance sheets). Also refer to Note 2 to the consolidated financial statements for such reclassifications made in conjunction with the adoption of recent accounting pronouncements. Further, a reclassification was made to the consolidated statements of cash flows to present, on a net basis, amounts previously presented separately within cash flows from operating activities (i.e., to present activity related to proceeds and expenditures of real estate development/other property for sale – normal operating activity in the Company's Land Operations segment – on a net basis similar to the presentation of changes in other inventories held by the Company). This change does not affect previously reported cash flows from operating activities in the consolidated statements of cash flows.
Real estate property, net and Other property, net	Real estate property, net: Real estate property, net primarily represents long-lived physical assets associated with the CRE segment's leasing activity (e.g., improved property leases and ground leases); it also includes landholdings and related assets in the Land Operations segment that the Company holds for either possible future development or future monetization as part of its simplification strategy. The balance primarily consists of land, buildings and improvements and is recorded at cost, net of accumulated depreciation. Expenditures for additions, improvements and other enhancements to real estate properties are capitalized, and minor replacements, maintenance and repairs that do not improve or extend asset lives are charged to expense as incurred. When assets related to real estate properties are retired or otherwise disposed of, the related cost and accumulated depreciation is removed from the accounts and any resulting gain or loss is included in results of operations for the respective period. Certain costs are capitalized related to the development and redevelopment of real estate properties, including pre-construction costs; real estate taxes; insurance; construction costs; and salaries and related costs of personnel directly involved. Additionally, the Company makes estimates as to the probability of certain development and redevelopment projects being completed. If the Company determines the development or redevelopment is no longer probable of completion, the Company expenses all capitalized costs which are not recoverable. Other property, net: Other property, net represents all other long-lived physical assets other than those presented in Real estate property, net and Real estate developments. The balance primarily consists of long-lived assets in the M&C segment, but also contains corporate long-lived physical assets and Land Operations long-lived physical assets that are used in other Land Operations activities and are not included in Real estate property, net or Real estate developments in the accompanying consolidated balance sheets. Other property, net is stated at cost, net of accumulated depreciation. Expenditures for major renewals and betterments are capitalized. Replacements, maintenance and repairs that do not improve or extend asset lives are expensed as incurred.
Acquisitions of real estate properties	Acquisitions of real estate properties: Acquisitions of real estate properties are evaluated to determine if they should be accounted for as asset acquisitions or business combinations (under current guidance, acquisitions of real estate properties are generally considered asset acquisitions). Under asset acquisition accounting, the Company estimates the fair value of acquired tangible assets (e.g., land, buildings and tenant improvements), identifiable intangible assets (e.g., in-place leases and favorable leases) and liabilities (e.g., unfavorable leases and assumed debt) based on an evaluation of available information at the date of the acquisition. Based on these estimates, the purchase consideration is allocated to the acquired assets and assumed liabilities. Transaction costs incurred during the acquisition process are capitalized as a component of the purchase consideration. In estimating the fair value of the tangible and intangible assets acquired and liabilities assumed, the Company considers information obtained about each property as a result of its due diligence and marketing and leasing activities and uses various valuation methods, such as estimated cash flow projections using appropriate discount and capitalization rates, analysis of recent comparable sales transactions, estimates of replacement costs net of depreciation and other available market information. The fair value of the tangible assets of an acquired property considers the value of the property as if it were vacant. Values for favorable leases acquired and unfavorable leases assumed are estimated based on the present value (using a discount rate reflecting the risks associated with leases acquired) of the difference between: (i) the contractual amounts to be paid pursuant to the leases negotiated and in-place at the time of acquisition and (ii) management’s estimate of fair market lease rates for the property or an equivalent property, measured over a period equal to the remaining term of the lease for favorable leases and the initial term plus the estimated term of any below-market, fixed-rate renewal options for unfavorable leases. The assets recognized and liabilities assumed are amortized over the related lease term plus fixed-rate renewal options, as appropriate. The purchase price is further allocated to in-place lease values and tenant relationship values based on management's evaluation of the specific characteristics of the acquired lease portfolio and the Company's overall relationship with the anchor tenants. Such amounts are amortized to expense over the remaining initial lease term (and expected renewal periods for tenant relationships).
Real estate developments	Real estate developments: Real estate developments represent certain costs capitalized and presented in the Land Operations segment that relate to (i) active real estate development projects and other land intended for sale or (ii) potential future real estate development projects intended for lease that would be part of future CRE segment operations. For potential future real estate development projects intended for lease, when management with the relevant authority has approved expenditures for activities clearly associated with the development and construction of a CRE segment project (generally after all required government agency approvals have been obtained), the capitalized costs associated with such project (e.g., historical cost of land) will be included in Real estate property, net in the accompanying consolidated balance sheets. Certain costs capitalized relating to active real estate development projects intended for sale may include pre-construction costs (e.g., costs related to land acquisition); construction costs (e.g., grading, roads, water and sewage systems, landscaping and project amenities); direct overhead costs (e.g., utilities, maintenance, insurance and real estate taxes); capitalized interest; and salaries and related costs of personnel directly involved. For development projects, capitalized costs are allocated using the direct method for expenditures that are specifically associated with the unit being sold and the relative-sales-value method for expenditures that benefit the entire project. Direct overhead costs incurred after the development project is substantially complete and ready to be marketed are charged to selling, general and administrative expense as incurred. All indirect overhead costs are charged to selling, general and administrative costs as incurred.
Capitalized Interest	Capitalized Interest: Interest costs on developments and major redevelopments are capitalized as part of real estate development and redevelopment projects that have not yet been placed into service. Capitalization of interest commences when development activities and expenditures begin and end when the asset is substantially complete and ready for its intended use or ready to be marketed.
Depreciation	Depreciation: Depreciation and amortization is computed using the straight-line method over the estimated useful lives of the assets or the units-of-production method for quarry production-related assets.
Intangible Assets	Intangible Assets: Real estate intangible assets are included in Real estate intangible assets, net in the accompanying consolidated balance sheets and are generally related to the acquisition of commercial real estate properties.
Cash and Cash Equivalents	Cash and Cash Equivalents: Cash equivalents consist of highly liquid investments with a maturity of three months or less at the date of purchase. The Company carries these investments at cost, which approximates fair value.
Restricted Cash	Restricted Cash: The Company's historical restricted cash balances have been primarily composed of proceeds from potential §1031 of the Internal Revenue Code of 1986, as amended (the "Code") tax-deferred sales held in escrow pending future use in acquisitions of replacement real estate assets (if within the required time period).
Allowance for Credit Losses	Allowance for Credit Losses : The Company estimates its allowance for credit losses for financial assets within the scope of ASC Topic 326, Financial Instruments - Credit Losses ("ASC 326"), at portfolio levels which include the CRE segment, the Land Operations segment and individual components of the M&C segment. Within these portfolio levels, the Company develops expected credit loss estimates by security type (which may include financing receivables or contract assets recognized in contracts with customers) by factoring historical loss information; information on both current conditions and reasonable and supportable forecasts of future conditions that may not be reflected in historical loss information; and other relevant credit quality information for the respective securities. As part of this process, the Company analyzes relevant information on a collective (pool) basis for securities with similar risk characteristics or separately on an individual basis when a financial asset does not share risk characteristics with other financial assets. The portfolios of financial assets within the scope of ASC 326 relating to the CRE and Land Operations segments include financing receivables (i.e., notes receivable), which are primarily composed of historical development and other land- related transactions. The assets in these portfolios are analyzed on an individual basis, in which the Company considers certain, available information specific to the counterparties to the transactions (e.g., liquidity and solvency of the counterparties) and environmental factors that are relevant in the assessment of the expected collectability of the future cash flows for these assets (e.g., changes and expected changes in the general economic environment in which the counterparty operates). For these assets, the Company uses a discounted cash flow method to calculate the allowance for credit losses using the asset's effective interest rate. The portfolios relating to the M&C segment represent discrete business components and are composed of contract assets from the Company's contracts with customers. The differing nature of the products and services provided by these components drive differences in historical and expected credit loss patterns and, as such, the Company tracks historical loss information at this portfolio level as part of information it uses to develop its estimate of expected credit losses. Further, as the Company believes its contract assets have different default risk expectations based on customer/project type, in addition to the historical loss information at the portfolio level, the Company also pools the respective portfolio's contract receivables by these different categories to make adjustments to its historical loss experience. Other information the Company analyzes and uses in its development of its allowance for credit losses include known customer information and environmental factors surrounding the customers' current and future ability to pay (i.e., changes and expected changes in the general economic environment in which the customers operate).
Allowance for Doubtful Accounts and Other receivables, net	Allowance for Doubtful Accounts: Allowances for doubtful accounts are established by management based on estimates of collectability. Estimates of collectability are principally based on an evaluation of the current financial condition of the Company’s customers and their payment history, which are regularly monitored by the Company. Other receivables, net : Other receivables, net are primarily composed of notes receivable recorded at cost less allowances for credit losses on the consolidated balance sheets.
Goodwill	Goodwill: The Company reviews goodwill for impairment at the reporting unit level annually or between annual tests if an event occurs or circumstances change that would more likely than not reduce the fair value of the reporting unit below its carrying amount. If the results of the Company's test indicates that a reporting unit's estimated fair value is less than its carrying value, an impairment charge is recognized for the amount by which the carrying amount exceeds the reporting unit's fair value, not to exceed the total amount of goodwill allocated to that reporting unit.
Self-Insured Liabilities	Self-Insured Liabilities: The Company is self-insured for certain losses that include, but are not limited to, employee health, workers’ compensation, general liability, real and personal property, and real estate construction warranty and defect claims. When feasible, the Company obtains third-party insurance coverage to limit its exposure to these claims. When estimating its self-insured liabilities, the Company considers a number of factors, including historical claims experience, demographic factors, and valuations provided by independent third-parties.
Redeemable Non-controlling Interest	Redeemable Noncontrolling Interest: As noted above, the Company has a 70% ownership interest in GLP Asphalt through its ownership of Grace Pacific. The noncontrolling interest in GLP Asphalt may be redeemed for cash at the option of the noncontrolling interest holder at a redemption value, which is derived from a specified formula based on the GLP Asphalt operating agreement (i.e., other than fair value). Non-controlling interests in subsidiaries that are redeemable for cash or other assets outside of the Company’s control at other than fair value are classified as mezzanine equity, outside of equity and liabilities. Such amounts are adjusted at each reporting date to the higher of (1) the amount resulting from the initial carrying amount, increased or decreased for cumulative amounts of the noncontrolling interest holder's share of net income or loss, share of other comprehensive income or loss and dividends and (2) the redemption value on each annual balance sheet date. The resulting changes in the carrying value, increases or decreases, are recorded with corresponding adjustments against earnings surplus or, in the absence of earnings surplus, common stock. When applicable, these adjustments are reflected in the computation of earnings per share using the two-class method.
Fair Value Measurements	Fair Value Measurements: ASC Topic 820, Fair Value Measurements and Disclosures ("ASC 820"), as amended, establishes a fair value hierarchy, which requires the Company to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The hierarchy places the highest priority on unadjusted quoted market prices in active markets for identical assets or liabilities (Level 1 measurements) and assigns the lowest priority to unobservable inputs (Level 3 measurements). The three levels of inputs within the hierarchy are defined as follows: Level 1: Quoted prices (unadjusted) for identical assets or liabilities in active markets. Level 2: Significant other observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active, or other inputs that are observable or can be corroborated by observable market data. Level 3: Significant unobservable inputs that reflect the Company’s own assumptions about the assumptions that market participants would use in pricing an asset or liability. If the technique used to measure fair value includes inputs from multiple levels of the fair value hierarchy, the lowest level of significant input determines the placement of the entire fair value measurement in the hierarchy.
Revenue Recognition	Revenue Recognition and Leases - The Company as a Lessor: Sources of revenue for the Company primarily include commercial property rentals, sales of real estate, real estate development projects, material sales and paving construction projects. The Company generates revenue from its three distinct business segments: Commercial Real Estate: The Commercial Real Estate segment owns, operates, leases, and manages a portfolio of retail, office, and industrial properties in Hawai‘i; it also leases urban land in Hawai‘i to third-party lessees. Commercial Real Estate revenue is recognized under lease accounting guidance with the Company as lessor.
Leases - The Company as Lessor	Leases - The Company as Lessor: The Company reviews its contracts to determine if they qualify as a lease. A contract is determined to be a lease when the right to substantially all of the economic benefits and to direct the use of an identified asset is transferred to a customer over a defined period of time for consideration. During this review, the Company evaluates among other items, asset specification, substitution rights, purchase options, operating rights and control over the asset during the contract period. The Company has lease agreements with lease and non-lease components, which are generally accounted for separately under ASC Topic 606, Revenue from Contracts with Customers . The Company has elected the practical expedient to not separate non-lease components from lease components for all classes of underlying assets where the component follows the same timing and pattern as the lease component and the lease component is classified as an operating lease. Non-lease components included in rental revenue primarily consist of tenant reimbursements for common area maintenance and other services paid for by the lessor and utilized by the lessee. Under the practical expedient, the Company accounts for the single, combined component under leasing guidance as the lease component is the predominant component in the contract. Rental revenue is primarily derived from operating leases and, therefore, is generally recognized on a straight-line basis over the term of the lease. Fixed contractual payments from the Company's leases are recognized on a straight-line basis over the terms of the respective leases. Straight-line rental revenue commences when the customer assumes control of the leased premises. The accrued straight-line receivable represents the amount by which straight-line rental revenue exceeds rents currently billed in accordance with lease agreements. Certain of the Company's lease agreements include terms for contingent rental revenue (e.g., percentage rents based on tenant sales volume) and tenant reimbursed property taxes, which are both accounted for as variable payments. Certain of the Company's leases include termination and/or extension options. Termination options allow the customer to terminate the lease prior to the end of the lease term under specific circumstances. The Company's extension options generally require a re-negotiation with the customer at market rates. Initial direct costs, primarily commissions, related to the leasing of properties are capitalized on the balance sheet and amortized over the lease term. All other costs to negotiate or arrange a lease are expensed as incurred. Accounts receivable related to leases are regularly evaluated for collectability, considering factors including, but not limited to, the credit quality of the customer, historical trends of the customer, and changes in customer payment terms. Upon determination that the collectability of a customer receivable is not probable, the Company will reverse the receivable and record a corresponding reduction of revenue previously recognized. Subsequent revenue is recorded on a cash basis until collectability on related billings becomes probable. Upon determination that portions of a tenant's receivables are not probable of collection (e.g., due to current conditions impacting specific amounts), the Company will record an allowance for doubtful accounts for the recorded operating lease receivable and record a corresponding adjustment of revenue previously recognized.
Land Operations, Materials and Construction	Land Operations: Revenues from sales of real estate are recognized at the point in time when control of the underlying goods is transferred to the customer and the payment is due (generally on the closing date). For certain development projects, the Company will use a percentage of completion for revenue recognition. Under this method, the amount of revenue recognized is based on the development costs that have been incurred throughout the reporting period as a percentage of total expected developments associated with the development project. Materials & Construction: Revenue from the Materials & Construction segment is primarily generated from material sales and paving and construction contracts. The recognition of revenue is based on the underlying terms of the transactions. Materials: Revenues from material sales, which include basalt aggregate, liquid asphalt and hot mix asphalt, are usually recognized at a point in time when control of the underlying goods is transferred to the customers (generally this occurs when materials are picked up by customers or their agents) and when the Company has a present right to payment for materials sold. Construction: The Company's construction contracts generally contain a single performance obligation as the promise to transfer individual goods or services are not separately identifiable from other promises in the contracts and is, therefore, not distinct. Revenue is earned from construction contracts over a period of time as control is continuously transferred to customers. Construction contracts can generally be categorized into two types of contracts with customers based on the respective payment terms; either lump sum or unit priced. Lump sum contracts require the total amount of work be performed under a single fixed price irrespective of actual quantities or actual costs. Earnings on both unit price contracts and lump sum fixed-price paving contracts are recognized using the percentage of completion, cost-to-cost, input method, as it is able to faithfully depict the transfer of control of the underlying assets to the customer. Related to its long-term construction contracts, due to the nature of the work required to be performed, estimating total revenue and cost at completion of the contract is complex, subject to many variables and requires significant judgment. Such estimates of contract revenue and cost are dependent on a number of factors that may change during a contract performance period, resulting in changes to estimated contract profitability. These factors include, but are not limited to, the completeness and accuracy of the original bid; changes in the timing of scheduled work; change orders; unusual weather conditions; changes in costs of labor and/or materials; changes in productivity expectations; and the expected, or actual, resolution terms for claims. Management evaluates changes in estimates on a contract by contract basis and uses the cumulative catch-up method to account for the changes in the period in which they are determined. Certain construction contracts include retainage provisions. The balances billed but not paid by customers pursuant to these provisions generally become due upon completion and acceptance of the project work or products by the owners. The Company deems its contract prices reflective of the standalone selling prices of the underlying goods and services since the contracts are required to go through a competitive bidding process. On a consolidated basis, in addition to disclosing amounts recorded as contract assets or contract liabilities in its consolidated balance sheets, the Company discloses information about the amount of contract consideration allocated to either wholly unsatisfied or partially satisfied performance obligations (see Note 13). Related to this disclosure, the Company has elected to not disclose information about the amount of contract consideration allocated to remaining performance obligations for certain contracts that have original expected durations of one year or less. This may occur with contracts for sales of real estate that are executed as of the end of the period with control of the underlying assets to be transferred to the customer subsequent to the end of the period. The closing date of such transactions will generally occur within one year or less of the contract execution date.
Leases - The Company as Lessee	Leases - The Company as Lessee: The Company determines if an arrangement is a lease at inception by considering whether that arrangement conveys the right to use an identified asset for a period of time in exchange for consideration. Operating leases are included in Operating lease right-of-use assets ("ROU assets") and Operating lease liabilities in the Company's consolidated balance sheets. ROU assets and lease liabilities related to finance leases are included in Other property, net and Notes payable and other debt, respectively, in the Company's consolidated balance sheets. ROU assets represent the Company's right to use an underlying asset for the lease term and lease liabilities represent the obligation to make lease payments arising from the lease. ROU assets and lease liabilities are recognized at commencement date based on the present value of lease payments over the lease term. As most of the Company's leases do not provide an implicit rate and are not readily determinable, the Company uses its incremental borrowing rate based on the estimated rate of interest for collateralized borrowing over a similar term of the lease payments at commencement date. ROU assets also include any lease payments made at or before the commencement date and excludes any lease incentives received. Lease terms may include options to extend or terminate the lease when it is reasonably certain that the Company will exercise that option. Operating lease expense for lease payments is recognized on a straight-line basis over the lease term. In connection with its application of the lease guidance, the Company has evaluated the lease and non-lease components within its leases where it is the lessee and has elected, for all classes of underling assets, the practical expedient to present lease and non-lease components in its lease agreements as one component. The Company has also elected, for all classes of underlying assets, to not recognize lease liabilities and lease assets for leases with a term of 12 months or less.
Impairment of Long-Lived Assets and Finite-Lived Intangible Assets	Impairment of Long-Lived Assets Held and Used and Finite-Lived Intangible Assets: Long-lived assets held and used, including finite-lived intangible assets, are reviewed for possible impairment when events or circumstances indicate that the carrying value may not be recoverable. In such an evaluation, the estimated future undiscounted cash flows generated by the asset are compared with the amount recorded for the asset to determine if its carrying value is not recoverable. If this review determines that the recorded value will not be recovered, the amount recorded for the asset is reduced to estimated fair value. Refer to Note 24 for further discussion.
Impairment of Investments in Affiliates	Impairment of Investments in Affiliates: The Company's investments in affiliates that are accounted for under the equity method are reviewed for impairment whenever there is evidence that fair value may be below carrying cost. An investment is written down to fair value if fair value is below carrying cost and the impairment is believed to be other-than-temporary.
Share-Based Compensation	Share-Based Compensation: The Company records compensation expense for all share-based payment awards made to employees and directors.
Employee Benefit Plans	Employee Benefit Plans: The Company provides a wide range of benefits to existing employees and retired employees, including single-employer defined benefit plans, postretirement, defined contribution plans, post-employment and health care benefits. The Company records amounts relating to these plans based on various actuarial assumptions, including discount rates, assumed rates of return, compensation increases, turnover rates and health care cost rate trends. The Company reviews its actuarial assumptions on an annual basis and makes modifications to the assumptions based on current economic conditions and trends. The Company believes that the assumptions utilized in recording obligations under the Company’s plans, which are presented in Note 17, are reasonable based on its experience and on advice from its independent actuaries; however, differences in actual experience or changes in the assumptions may materially affect the Company’s financial position or results of operations.
Income Taxes	Income Taxes: The Company makes certain estimates and judgments in determining income tax expense for financial statement purposes. These estimates and judgments are applied in the calculation of tax credits, tax benefits and deductions, and in the calculation of certain deferred tax assets and liabilities, which arise from differences in the timing of recognition of revenue and expense for tax and financial statement purposes. Deferred tax assets and deferred tax liabilities are adjusted to the extent necessary to reflect tax rates expected to be in effect when the temporary differences reverse. Adjustments may be required to deferred tax assets and deferred tax liabilities due to changes in tax laws and audit adjustments by tax authorities. To the extent adjustments are required in any given period, the adjustments would be included within the tax provision in the accompanying consolidated statements of operations.
Discontinued Operations	Discontinued Operations: In December 2016, the Company completed its final sugar harvest and ceased its sugar operations. Costs related to the cessation of sugar operations are presented as discontinued operations in the consolidated statements of operations. Liabilities related to the cessation of sugar operations are presented within Accrued and other liabilities in the consolidated balance sheets.
Earnings Per Share (''EPS'')	Earnings Per Share (“EPS”): Basic and diluted earnings per share are computed and disclosed in accordance with ASC Topic 260, Earnings Per Share . The Company utilizes the two-class method to compute earnings available to common
Recently adopted and issued accounting pronouncements	Recently adopted accounting pronouncements In August 2018, the FASB issued Accounting Standards Update ("ASU") No. 2018-14, Changes to the Disclosure Requirements for Defined Benefit Plans ("ASU 2018-14"). The guidance clarifies current disclosures and removes several disclosure requirements including accumulated other comprehensive income expected to be recognized over the next fiscal year and amount and timing of plan assets expected to be returned to the employer. The new guidance also requires additional disclosures and, when applicable, explanations for significant gains and losses related to changes in the benefit plan obligation. ASU 2018-14 was effective for fiscal years ending after December 15, 2020. The adoption of this standard did not have any impact on the Company's financial position or results of operations and did not have a significant impact on its disclosures for defined benefit plans (refer to Note 17). In June 2016, the FASB issued ASU No. 2016-13, Measurement of Credit Losses on Financial Instruments ("ASU 2016-13"), which requires the measurement and recognition of expected credit losses for financial assets held at amortized cost and available for sale debt securities, and amended the guidance thereafter. The guidance in ASU 2016-13 and related amendments was codified into ASC 326. ASC 326 amended prior guidance on the impairment of financial instruments by adding an impairment model based on expected losses rather than incurred losses that would be recognized through an allowance for credit losses. Amendments included in ASC 326 further clarified that operating lease receivables are not within the scope of ASC 326 and are to remain governed by lease guidance. The Company completed its adoption of the provisions of ASU 2016-13, as amended, with an effective date of January 1, 2020, using a modified retrospective approach for its financial assets in the scope of ASC 326, which consisted of in-scope financial assets held at amortized cost (presented as part of the Company's accounts and retention receivables, other receivables and other contract assets). As a result of the guidance, the Company is required to estimate and record non-cash credit losses related to these financial assets and expand its credit quality disclosures. Results for reporting periods beginning after January 1, 2020 are presented under ASC 326 while prior period amounts continue to be reported in accordance with previously applicable guidance. The Company recorded a net decrease of $4.1 million to total equity as of January 1, 2020, with a corresponding increase to previously recorded valuation accounts for its financial assets held at amortized cost for the cumulative effect of adopting ASC 326. The new standard did not have a material impact to any of the Company's other financial assets or instruments presented on its consolidated balance sheet. The Company further evaluated the impact of adopting ASC 326 on income tax accounting and recorded corresponding deferred tax assets related to the valuation accounts which were offset by the valuation allowance on its recorded deferred taxes (refer to Note 18). The following table illustrates the impact of the Company's adoption of ASC 326 (in millions): January 1, 2020 As Reported under ASC 326 Prior to ASC 326 Adoption Impact of ASC 326 Adoption Assets: Allowance for credit losses on Accounts receivable and retention $ 1.6 $ 0.3 $ 1.3 Allowance for credit losses on Other receivables 4.3 1.6 2.7 Allowance for credit losses on costs and estimated earnings in excess of billings on uncompleted contracts 1 0.1 — 0.1 Total $ 6.0 $ 1.9 $ 4.1 1 Included in Prepaid expenses and other assets in the consolidated balance sheets. In August 2018, the FASB issued ASU No. 2018-13, Changes to the Disclosure Requirements for Fair Value Measurement. The guidance amends and removes several disclosure requirements, including the valuation processes for Level 3 fair value measurements. This ASU also modifies some disclosure requirements and requires additional disclosures for changes in unrealized gains and losses included in other comprehensive income for recurring Level 3 fair value measurements and requires the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements. The adoption of this standard did not have a material impact on the Company's consolidated financial statements or footnote disclosures. In August 2018, the FASB issued ASU No. 2018-15, Intangibles - Goodwill and Other: Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That is a Service Contract . The guidance aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal-use software license). Accordingly, the amendments require an entity (customer) in a hosting arrangement that is a service contract to follow the guidance in Subtopic 350-40 to determine which implementation costs to capitalize as an asset related to the service contract and which costs to expense. The amendments also require the entity (customer) to expense the capitalized implementation costs of a hosting arrangement that is a service contract over the term of the hosting arrangement, which includes reasonably certain renewals. The adoption of this standard did not have a material impact on the Company's financial position or results of operations. Reclassifications in conjunction with recently adopted accounting pronouncements In conjunction with its adoption of ASC 326 with an effective date of January 1, 2020, the Company made certain reclassifications in its presentation of the consolidated balance sheets for amounts related to contract receivables and financing receivables and, as a result, certain amounts in the prior year have been reclassified to conform to the current year presentation; such reclassifications were not material to the consolidated financial statements. One such reclassification was to present interest receivables in the same line as the related financing receivables (affecting Accounts receivable, net and Other receivables). Another was to aggregate Accounts receivable, net and Contracts retention into a single line item in the accompanying consolidated balance sheets (refer to Note 13 where such balances will continue to be presented separately). Further, certain amounts historically related to the allowance for doubtful accounts were reclassified under current presentation (e.g., certain amounts are now presented under the allowance for credit losses calculated under ASC 326 as described in Note 6 to the consolidated financial statements). Recently issued accounting pronouncements In March 2020, the FASB issued ASU No. 2020-04, Reference Rate Reform , establishing ASC Topic 848, and amended the standard thereafter ("ASC 848"). ASC 848 provides optional practical expedients and exceptions related to the impacts of reference rate reform that affect certain debt, leases, derivatives and other contracts if certain criteria are met. The amendments apply only to contracts and hedging relationships that reference LIBOR or another reference rate expected to be discontinued due to reference rate reform. These amendments are effective immediately and may be applied prospectively to contract modifications made and hedging relationships entered into or evaluated on or before December 31, 2022. Reference rate reform has not had a material impact on any of the Company's existing contracts, therefore, the Company has not elected to apply any of the optional practical expedients and exceptions under ASC 848 as of the current date. The Company will assess future changes in its contracts and the impact of electing to apply the optional practical expedients and exceptions provided by ASC 848 as they occur, but does not expect their application will have a material effect on its financial position or results of operations.

Significant Accounting Polici_3

Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2020
Accounting Policies [Abstract]
Schedule of Other Property and Estimated Useful Lives of Property	Estimated useful lives of property are as follows: Classification Range of Life (in years) Building and improvements 10 to 40 Leasehold improvements 5 to 10 (lesser of useful life or lease term) Water, power and sewer systems 5 to 50 Asphalt plants, machinery and equipment 2 to 35 Other property improvements 3 to 35 Real estate property, net as of December 31, 2020 and 2019 includes the following (in millions): 2020 2019 Land $ 769.6 $ 768.8 Buildings 696.0 692.4 Other property improvements 84.1 79.0 Subtotal 1,549.7 1,540.2 Accumulated depreciation (154.4) (127.5) Real estate property, net $ 1,395.3 $ 1,412.7 Other property, net, as of December 31, 2020 and 2019 was as follows (in millions): 2020 2019 Land $ 39.3 $ 38.4 Buildings 18.5 19.7 Asphalt plants, machinery and equipment 104.4 105.5 Water, power and sewer systems 19.7 30.6 Other property improvements 6.4 6.8 Subtotal 188.3 201.0 Accumulated depreciation (77.5) (76.6) Other property, net $ 110.8 $ 124.4
Schedule of Interest and Other Income (Expense)	Interest and other income (expense), net for the years ended December 31, 2020, 2019 and 2018 included the following (in millions): 2020 2019 2018 Pension and postretirement benefit (expense) $ (2.6) $ (3.1) $ (3.0) Interest income 1.7 3.0 1.5 Gain (loss) on sale of joint venture interest — 2.6 4.2 Reductions in solar investments, net — (0.1) (0.5) Other income (expense) 1.2 0.8 0.1 Interest and other income (expense), net $ 0.3 $ 3.2 $ 2.3
Impact of ASC 326	The following table illustrates the impact of the Company's adoption of ASC 326 (in millions): January 1, 2020 As Reported under ASC 326 Prior to ASC 326 Adoption Impact of ASC 326 Adoption Assets: Allowance for credit losses on Accounts receivable and retention $ 1.6 $ 0.3 $ 1.3 Allowance for credit losses on Other receivables 4.3 1.6 2.7 Allowance for credit losses on costs and estimated earnings in excess of billings on uncompleted contracts 1 0.1 — 0.1 Total $ 6.0 $ 1.9 $ 4.1

Real Estate Property, Net and_2

Real Estate Property, Net and Other Property, Net (Tables)	12 Months Ended
	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Schedule of Real Estate Property, Net	Estimated useful lives of property are as follows: Classification Range of Life (in years) Building and improvements 10 to 40 Leasehold improvements 5 to 10 (lesser of useful life or lease term) Water, power and sewer systems 5 to 50 Asphalt plants, machinery and equipment 2 to 35 Other property improvements 3 to 35 Real estate property, net as of December 31, 2020 and 2019 includes the following (in millions): 2020 2019 Land $ 769.6 $ 768.8 Buildings 696.0 692.4 Other property improvements 84.1 79.0 Subtotal 1,549.7 1,540.2 Accumulated depreciation (154.4) (127.5) Real estate property, net $ 1,395.3 $ 1,412.7 Other property, net, as of December 31, 2020 and 2019 was as follows (in millions): 2020 2019 Land $ 39.3 $ 38.4 Buildings 18.5 19.7 Asphalt plants, machinery and equipment 104.4 105.5 Water, power and sewer systems 19.7 30.6 Other property improvements 6.4 6.8 Subtotal 188.3 201.0 Accumulated depreciation (77.5) (76.6) Other property, net $ 110.8 $ 124.4

Acquisitions and Intangible A_2

Acquisitions and Intangible Assets, Net (Tables)	12 Months Ended
	Dec. 31, 2020
Real Estate [Abstract]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	The allocation of purchase price to the aggregate assets acquired and liabilities assumed in connection with the five commercial real estate acquisitions in 2019 was as follows (in millions): Fair value of assets acquired and liabilities assumed Assets acquired: Land $ 106.9 Property and improvements 91.3 In-place leases 23.2 Favorable leases 4.3 Total assets acquired $ 225.7 Liabilities assumed: Unfavorable leases $ 7.3 Total liabilities assumed $ 7.3 Net assets acquired $ 218.4 The allocation of purchase price to assets acquired and liabilities assumed were as follows (in millions): Fair value of assets acquired and liabilities assumed Assets acquired: Land $ 92.8 Property and improvements 173.9 In-place leases 32.0 Favorable leases 6.7 Total assets acquired $ 305.4 Liabilities assumed: Unfavorable leases $ 2.7 Notes payable and other debt 1 61.0 Total liabilities assumed $ 63.7 Net assets acquired $ 241.7 1 Includes a fair value adjustment of $1.0 million.
Schedule of Intangible Assets	Real estate intangible assets, net and other intangible assets included in Prepaid expenses and other assets as of December 31, 2020 and 2019 were as follows (in millions): 2020 2019 In-place leases $ 125.0 $ 125.2 Favorable leases 29.0 29.0 Accumulated amortization of in-place leases (73.8) (63.4) Accumulated amortization of favorable leases (18.3) (15.9) Real estate intangible assets, net $ 61.9 $ 74.9 Other intangible assets $ 20.4 $ 20.2 Accumulated amortization of other intangible assets (10.2) (7.9) Other intangible assets, net $ 10.2 $ 12.3
Schedule of Estimated Future Amortization Expenses	Estimated amortization expenses related to intangible assets over the next five years are as follows (in millions): Estimated 2021 $ 11.5 2022 9.1 2023 8.1 2024 5.8 2025 5.4

Investments in Affiliates (Tabl

Investments in Affiliates (Tables)	12 Months Ended
	Dec. 31, 2020
Equity Method Investments and Joint Ventures [Abstract]
Equity Method Investments	A summary of combined assets and liabilities reported by such entities accounted for by the equity method as of December 31, 2020 and 2019 were as follows (in millions): 2020 2019 Current assets $ 73.0 $ 79.3 Non-current assets 688.0 697.9 Total assets $ 761.0 $ 777.2 Current liabilities $ 33.5 $ 27.1 Non-current liabilities 96.7 109.0 Total liabilities $ 130.2 $ 136.1 A summary of combined operating results reported by such entities accounted for by the equity method for each of the years ended December 31, 2020, 2019 and 2018 were as follows (in millions): 2020 2019 2018 Revenues $ 174.2 $ 191.9 $ 243.6 Operating costs and expenses 147.1 173.0 209.7 Gross profit (loss) $ 27.1 $ 18.9 $ 33.9 Income (loss) from Continuing Operations* $ 12.1 $ 6.6 $ 17.4 Net Income (loss)* $ 11.6 $ 6.6 $ 16.5 * Includes earnings from equity method investments held by the investee.

Allowance and Other Reserves (T

Allowance and Other Reserves (Tables)	12 Months Ended
	Dec. 31, 2020
Credit Loss [Abstract]
Schedule of Changes in Allowance for Doubtful Accounts	The following table presents the balances and activity (including reclassifications) in the various allowance and reserve accounts related to the Company's accounts receivable and financial assets for the three years ended December 31, 2020, 2019 and 2018 (in millions): Balance at beginning of year Impact of adoption of ASC 326 1 Impact of adoption of ASC 326 2 Additions 3 Deductions or other 4 Balance at end of year Year ended December 31, 2020 Deducted from assets Reserve for cash basis tenants $ 0.9 $ — $ — $ 10.6 $ 1.2 $ 12.7 Allowance for doubtful accounts $ 0.6 (0.3) — 3.6 (1.3) $ 2.6 Reserve for contract credits $ 2.3 — — — — $ 2.3 Allowance for credit losses - financing receivables $ — 1.6 2.7 (0.4) — $ 3.9 Allowance for credit losses - contract assets $ — 0.3 1.4 (0.9) (0.1) $ 0.7 Loans allowance $ 1.6 (1.6) — — — $ — Other reserves $ 0.4 — — — (0.4) $ — Year ended December 31, 2019 Deducted from assets Reserve for cash basis tenants $ — — — — 0.9 $ 0.9 Allowance for doubtful accounts $ 2.0 — — (0.4) (1.0) $ 0.6 Reserve for contract credits $ — — — 2.3 — $ 2.3 Loans allowance $ 1.6 — — — — $ 1.6 Other reserves $ 0.4 — — — — $ 0.4 Year ended December 31, 2018 Deducted from assets Allowance for doubtful accounts $ 1.4 — — 1.3 (0.7) $ 2.0 Loans allowance $ 1.6 — — — — $ 1.6 Other reserves $ 0.4 $ — $ — $ — $ — $ 0.4 1 Reclassifications from other reserves or allowances that fall into the scope of ASC 326. 2 Impact of adoption of ASC 326 recorded against total equity. 3 Net provisions charged against income. 4 Write offs or other activity (e.g., reclassifications for movement of allowances to cash basis reserves).

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Dec. 31, 2020
Inventory Disclosure [Abstract]
Schedule of Inventories	Inventories are stated at the lower of cost (principally average cost, first-in, first-out basis) or net realizable value. Inventories as of December 31, 2020 and 2019 were as follows (in millions): 2020 2019 Asphalt $ 4.2 $ 8.0 Processed rock and sand 7.9 6.6 Work in progress 3.2 2.9 Retail merchandise 2.1 2.0 Parts, materials and supplies inventories 1.0 1.2 Total $ 18.4 $ 20.7

Goodwill (Tables)

Goodwill (Tables)	12 Months Ended
	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	The changes in the carrying amount of goodwill (for each period a consolidated balance sheet is presented) allocated to the Company's reportable segments starting with the year ended December 31, 2019 and continuing to the year ended December 31, 2020 were as follows (in millions): Materials & Construction Commercial Real Estate Total Carrying amount of goodwill: Gross amount of goodwill $ 93.6 $ 8.7 $ 102.3 Accumulated impairment losses (37.2) — (37.2) Balance, January 1, 2019 $ 56.4 $ 8.7 $ 65.1 Impairment losses (49.7) — (49.7) Carrying amount of goodwill: Gross amount of goodwill 93.6 8.7 102.3 Accumulated impairment losses (86.9) — (86.9) Balance, December 31, 2019 $ 6.7 $ 8.7 $ 15.4 Gross amount of goodwill included in disposal (7.1) — (7.1) Accumulated impairment losses included in disposal 2.2 — 2.2 Carrying amount of goodwill: Gross amount of goodwill 86.5 8.7 95.2 Accumulated impairment losses (84.7) — (84.7) Balance, December 31, 2020 $ 1.8 $ 8.7 $ 10.5

Notes Payable and Other Debt (T

Notes Payable and Other Debt (Tables)	12 Months Ended
	Dec. 31, 2020
Debt Disclosure [Abstract]
Schedule of Notes Payable and Long-term Debt	As of December 31, 2020 and 2019, Notes payable and other debt consisted of the following (in millions): Principal Outstanding Debt Interest Rate (%) Maturity Date December 31, 2020 December 31, 2019 Secured: Kailua Town Center (1) 2021 $ 9.8 $ 10.2 Kailua Town Center #2 3.15% 2021 4.5 4.6 Heavy Equipment Financing (2) (2) 3.2 3.6 Laulani Village 3.93% 2024 61.3 62.0 Pearl Highlands 4.15% 2024 81.4 83.4 Manoa Marketplace (3) 2029 57.9 59.5 Subtotal $ 218.1 $ 223.3 Unsecured: Series D Note —% 2020 — 16.2 Bank syndicated loan (4) 2023 50.0 50.0 Series A Note 5.53% 2024 28.4 28.5 Series J Note 4.66% 2025 10.0 10.0 Series B Note 5.55% 2026 46.0 46.0 Series C Note 5.56% 2026 22.0 23.0 Series F Note 4.35% 2026 19.7 22.0 Series H Note 4.04% 2026 50.0 50.0 Series K Note 4.81% 2027 34.5 34.5 Series G Note 3.88% 2027 29.6 35.0 Series L Note 4.89% 2028 18.0 18.0 Series I Note 4.16% 2028 25.0 25.0 Term Loan 5 4.30% 2029 25.0 25.0 Subtotal $ 358.2 $ 383.2 Revolving Credit Facilities: GLP Asphalt revolving credit facility (5) 2021 — — A&B Revolver (6) 2022 111.0 98.7 Subtotal $ 111.0 $ 98.7 Total Debt (contractual) $ 687.3 $ 705.2 Unamortized debt premium (discount) — (0.1) Unamortized debt issuance costs (0.2) (0.5) Total debt (carrying value) $ 687.1 $ 704.6 (1) Loan has a stated interest rate of LIBOR plus 1.50%, but is swapped through maturity to a 5.95% fixed rate. (2) Loans have a weighted average stated interest rate of approximately 3.0% and stated maturity dates ranging from 2021 to 2024. (3) Loan has a stated interest rate of LIBOR plus 1.35% but is swapped through maturity to a 3.14% fixed rate. (4) Loan has a stated interest rate of LIBOR plus 2.00% but is swapped through maturity to a 3.35% fixed rate. (5) Loan has a stated interest rate of LIBOR plus 1.25%. (6) Loan has a stated interest rate of LIBOR plus 2.05%, based on pricing grid.
Schedule of Debt Principal Payments	At December 31, 2020, debt principal payments and maturities during the next five years and thereafter and the corresponding amount of unamortized deferred financing costs or debt discounts or premiums were as follows (in millions): Scheduled principal payments 2021 2022 2023 2024 2025 There- after Total (Unamort Total Secured debt $ 20.4 $ 6.0 $ 5.9 $ 134.9 $ 1.9 $ 49.0 $ 218.1 $ (0.1) $ 218.0 Unsecured debt 23.1 24.1 78.6 22.0 38.3 172.1 358.2 (0.1) 358.1 Revolving credit facilities — 111.0 — — — — 111.0 — 111.0 Total Notes payable and other debt $ 43.5 $ 141.1 $ 84.5 $ 156.9 $ 40.2 $ 221.1 $ 687.3 $ (0.2) $ 687.1

Derivative Instruments (Tables)

Derivative Instruments (Tables)	12 Months Ended
	Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Interest Rate Swap	as follows (dollars in millions): Effective Maturity Fixed Notional Amount at Asset (Liability) Fair Value at Classification on Date Date Interest Rate December 31, 2020 December 31, 2020 December 31, 2019 Balance Sheet 4/7/2016 8/1/2029 3.14% $ 57.9 $ (4.8) $ (0.2) Accrued and other liabilities 2/13/2020 2/27/2023 3.35% $ 50.0 $ (1.3) N/A Accrued and other liabilities As of December 31, 2020, the Company has one interest rate swap that has not been designated as a cash flow hedge, whose key terms are as follows (dollars in millions): Effective Maturity Fixed Notional Amount at Asset (Liability) Fair Value at Classification on Date Date Interest Rate December 31, 2020 December 31, 2020 December 31, 2019 Balance Sheet 1/1/2014 9/1/2021 5.95% $ 9.8 $ (0.3) $ (0.5) Accrued and other liabilities
Schedule of Derivative Instruments in Consolidated Statements of Comprehensive Income (Loss)	The following table represents the pre-tax effect of the derivative instruments in the Company's consolidated statement of comprehensive income (loss) during the years ended December 31, 2020 and 2019 (in millions): 2020 2019 Derivatives in Designated Cash Flow Hedging Relationships: Amount of gain (loss) recognized in OCI on derivatives $ (6.9) $ (4.0) Impact of reclassification adjustment to interest expense included in Net Income (Loss) $ 1.0 $ (0.1)

Revenue and Contract Balances (

Revenue and Contract Balances (Tables)	12 Months Ended
	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	Revenue by type for the years ended December 31, 2020, 2019 and 2018 was as follows (in millions): 2020 2019 2018 Revenues: Commercial Real Estate $ 150.0 $ 160.6 $ 140.3 Land Operations: Development sales revenue 7.9 57.2 54.3 Unimproved/other property sales revenue 9.7 32.4 210.5 Other operating revenue 23.0 24.5 24.7 Land Operations 40.6 114.1 289.5 Materials & Construction 114.7 160.5 214.6 Total revenues $ 305.3 $ 435.2 $ 644.4
Schedule of Contract Balances	The following table provides information about receivables, contract assets and contract liabilities from contracts with customers as of December 31, 2020 and 2019: (in millions) 2020 2019 Accounts receivable $ 39.5 $ 43.6 Contracts retention 7.3 8.6 Allowances (credit losses and doubtful accounts) (3.3) (0.6) Accounts receivable and retention, net $ 43.5 $ 51.6 Costs and estimated earnings in excess of billings on uncompleted contracts $ 2.3 $ 10.0 Billings in excess of costs and estimated earnings on uncompleted contracts $ 8.5 $ 7.9 Variable consideration 1 $ 62.0 $ 62.0 Other deferred revenue $ 4.9 $ 5.6 1 Variable consideration deferred as of the period end related to amounts received in the sale of agricultural land on Maui in 2018 that, under revenue recognition guidance, could not be included in the transaction price (refer to Note 23). Finally, additional information related to uncompleted contracts (presented in the contract assets and contract liabilities table above) as of December 31, 2020 and 2019 is as follows (in millions): 2020 2019 Costs incurred on uncompleted contracts $ 389.8 $ 339.3 Estimated earnings 41.1 38.3 Subtotal 430.9 377.6 Billings to date (437.1) (375.5) Total $ (6.2) $ 2.1

(Tables)

(Tables)	12 Months Ended
	Dec. 31, 2020
Leases [Abstract]
Schedule of Historical Cost and Accumulated Depreciation of Leased Property	The historical cost of, and accumulated depreciation on, leased property as of December 31, 2020 and 2019 was as follows (in millions): 2020 2019 Leased property - real estate $ 1,525.3 $ 1,511.3 Less: Accumulated depreciation (152.2) (125.0) Property under operating leases, net $ 1,373.1 $ 1,386.3
Schedule of Rental Income Under Non-cancelable Operating Leases	Total rental income (i.e., revenue) under these operating leases relating to lease payments and variable lease payments were as follows (in millions): 2020 2019 Lease payments $ 113.7 $ 111.2 Variable lease payments 39.3 51.8 Total rental income $ 153.0 $ 163.0
Schedule of Future Minimum Rentals on Non-cancelable Operating Leases	Contractual future lease payments to be received on non-cancelable operating leases as of December 31, 2020 were as follows (in millions): 2021 $ 119.3 2022 109.2 2023 98.4 2024 85.4 2025 73.2 Thereafter 502.3 Total future lease payments to be received $ 987.8

Leases - The Company as Lessee

Leases - The Company as Lessee (Tables)	12 Months Ended
	Dec. 31, 2020
Leases [Abstract]
Lease Cost and Other Amounts Relating to Finance and Operating Leases	Lease expense for operating leases that provide for future escalations are accounted for on a straight-line basis. For the year ended December 31, 2020, lease expense under operating and finance leases was as follows (in millions): 2020 2019 Lease cost - operating and finance leases: Operating lease cost $ 4.6 $ 5.1 Finance lease cost: Amortization of right-of-use assets 1.2 0.6 Interest on lease liabilities 0.1 0.1 Total lease cost - operating and finance leases $ 5.9 $ 5.8 Amounts related to other lease transactions: Short-term lease cost $ 0.6 $ 0.7 Variable lease cost $ 0.6 $ 0.5 Sublease income $ 0.3 $ 0.3 Other amounts relating to leases segregated between those for finance and operating leases include the following for the year ended December 31, 2020 and December 31, 2019 (in millions): 2020 2019 Cash paid for amounts included in the measurement of lease liabilities: Operating cash outflows from operating leases $ 4.6 $ 5.3 Operating cash outflows from financing leases $ 0.1 $ 0.1 Financing cash flows from finance leases $ 1.2 $ 0.6 Other details: Weighted-average remaining lease term (years) - operating leases 9.1 9.3 Weighted-average remaining lease term (years) - finance leases 2.9 3.3 Weighted-average discount rate - operating leases 4.4 % 4.4 % Weighted-average discount rate - finance leases 3.2 % 3.1 %
Schedule of Finance Lease Maturities	Future lease payments under non-cancelable operating and finance leases as of December 31, 2020 were as follows (in millions): Operating Leases Finance Leases 2021 $ 4.6 $ 1.4 2022 4.6 1.0 2023 3.4 0.7 2024 2.7 0.2 2025 1.2 — Thereafter 7.9 — Total lease payments $ 24.4 $ 3.3 Less: Interest (6.0) (0.1) Total lease liabilities $ 18.4 $ 3.2
Schedule of Lessee Future Payments Under Non-cancelable Operating Leases	Future lease payments under non-cancelable operating and finance leases as of December 31, 2020 were as follows (in millions): Operating Leases Finance Leases 2021 $ 4.6 $ 1.4 2022 4.6 1.0 2023 3.4 0.7 2024 2.7 0.2 2025 1.2 — Thereafter 7.9 — Total lease payments $ 24.4 $ 3.3 Less: Interest (6.0) (0.1) Total lease liabilities $ 18.4 $ 3.2
ROU Assets and Lease liabilities related to Balance Sheets Information	ROU assets and lease liabilities related to operating leases are presented separately on the consolidated balance sheets. Information for finance leases as of the years ended December 31, 2020 and 2019 were as follows (in millions): 2020 2019 ROU assets $ 4.2 $ 3.8 Lease liabilities $ 3.2 $ 3.5

Share-Based Payment Awards (Tab

Share-Based Payment Awards (Tables)	12 Months Ended
	Dec. 31, 2020
Share-based Payment Arrangement [Abstract]
Schedule of Stock Option Activity	The following table summarizes the Company's stock option activity for the year ended December 31, 2020 (in thousands, except weighted-average exercise price and weighted-average contractual life): 2012 Plan Weighted- Weighted- Aggregate Outstanding, January 1, 2020 352.2 $ 13.95 Exercised (254.3) $ 13.62 Canceled — $ — Outstanding, December 31, 2020 97.9 $ 14.80 1.0 year $ 221.7 Vested or expected to vest 97.9 $ 14.80 1.0 year $ 221.7 Exercisable, December 31, 2020 97.9 $ 14.80 1.0 year $ 221.7
Summary of Non-vested Restricted Stock Unit Activity	The following table summarizes non-vested restricted stock unit activity for the year ended December 31, 2020 (in thousands, except weighted-average grant-date fair value amounts): 2012 Plan Weighted- Outstanding, January 1, 2020 454.7 $ 27.33 Granted 286.2 $ 22.01 Vested (135.3) $ 25.14 Canceled (55.1) $ 23.93 Outstanding, December 31, 2020 550.5 $ 25.44
Schedule of Fair Value Assumptions of Market-based Awards	The fair value of the Company's market-based awards is estimated using the Company's stock price on the date of grant and the probability of vesting using a Monte Carlo simulation with the following weighted-average assumptions: 2020 Grants 2019 Grants 2018 Grants Volatility of A&B common stock 22.6 % 23.6 % 22.7 % Average volatility of peer companies 22.5 % 24.2 % 21.6 % Risk-free interest rate 1.3 % 2.5 % 2.3 %
Summary of Compensation Cost related to Share-based Payments	A summary of compensation cost related to share-based payments is as follows for the years ended December 31, 2020, 2019 and 2018 (in millions): 2020 2019 2018 Share-based expense: Time-based and market-based restricted stock units $ 5.8 $ 5.4 $ 4.7 Total share-based expense 5.8 5.4 4.7 Total recognized tax benefit — — — Share-based expense (net of tax) $ 5.8 $ 5.4 $ 4.7 Cash received upon option exercise $ 3.5 $ 2.6 $ 0.4 Intrinsic value of options exercised $ 0.5 $ 2.6 $ 0.4 Tax benefit realized upon option exercise $ — $ — $ — Fair value of stock vested $ 3.0 $ 4.5 $ 4.0

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2020
Retirement Benefits [Abstract]
Schedule of Net Funded Status	The status of the funded defined benefit pension plan and the unfunded accumulated post-retirement benefit plans at December 31, 2020 and 2019 and are shown below (in millions): Pension Benefits Other Post-retirement Benefits Non-qualified Plan Benefits 2020 2019 2020 2019 2020 2019 Change in Benefit Obligation Benefit obligation at beginning of year $ 204.4 $ 189.6 $ 10.1 $ 10.6 $ 2.8 $ 2.7 Service cost 0.8 2.3 0.1 0.1 — 0.1 Interest cost 6.5 8.0 0.3 0.4 0.1 0.1 Plan participants’ contributions — — 0.8 0.8 — — Actuarial (gain) loss 21.1 19.0 3.7 (0.3) 0.2 0.2 Benefits paid (14.1) (14.5) (1.5) (1.5) — (0.3) Settlement — — — — — — Benefit obligation at end of year $ 218.7 $ 204.4 $ 13.5 $ 10.1 $ 3.1 $ 2.8 Change in Plan Assets Fair value of plan assets at beginning of year $ 190.5 $ 173.6 $ — $ — $ — $ — Actual return on plan assets 24.2 31.4 — — — — Employer contributions — — 0.7 0.8 — 0.3 Participant contributions — — 0.8 0.7 — — Benefits paid (14.1) (14.5) (1.5) (1.5) — (0.3) Settlement — — — — — — Fair value of plan assets at end of year $ 200.6 $ 190.5 $ — $ — $ — $ — Funded Status (Recognized Liability 1 ) $ (18.1) $ (13.9) $ (13.5) $ (10.1) $ (3.1) $ (2.8) 1 Presented as Accrued pension and post-retirement benefits as of December 31, 2020 and 2019.
Weighted Average and Target Asset Allocations	The Company’s target allocation by asset category as of December 31, 2020, and the weighted-average asset allocations at December 31, 2020 and 2019 were as follows: Target 2020 2019 Fixed income securities 1 100 % 99 % 99 % Cash and cash equivalents — % 1 % 1 % Total 100 % 100 % 100 % 1 Fixed income securities include investment-grade corporate bonds from diversified industries and U.S. Treasuries.
Schedule of Allocation of Plan Assets	The fair values of the Company’s defined benefit pension plan assets at December 31, 2020 and 2019, by asset category, are as follows (in millions): Fair Value Measurements at December 31, 2020 December 31, 2019 Total Quoted Prices in Active Markets (Level 1) Significant Observable Inputs Total Quoted Prices in Active Markets (Level 1) Significant Observable Inputs Asset Category Cash and cash equivalents $ 1.2 $ 1.2 $ — $ 1.2 $ 1.2 $ — Fixed income securities U.S. Treasury obligations — — — — — — Domestic corporate bonds and notes — — — — — — Foreign corporate bonds — — — — — — Assets measured at NAV 199.4 — — 189.3 — — Total $ 200.6 $ 1.2 $ — $ 190.5 $ 1.2 $ —
Schedule of Expected Benefit Payments	The estimated future benefit payments for the next ten years are as follows (in millions): 2021 2022 2023 2024 2025 2026-2030 Estimated Benefit Payments Pension $ 13.2 $ 13.1 $ 12.9 $ 13.2 $ 12.7 $ 59.5 Post-retirement Benefits 0.8 0.8 0.7 0.7 0.7 3.3 Non-qualified Plan Benefits — 1.2 — — 1.9 — Total estimated benefit payments $ 14.0 $ 15.1 $ 13.6 $ 13.9 $ 15.3 $ 62.8
Summary of Components of Net Periodic Benefit Cost and Other Amounts Recognized in Other Comprehensive Loss	Components of the net periodic benefit cost and other amounts recognized in other comprehensive income (loss) for the defined benefit pension plans and the post-retirement health care and life insurance benefit plans during 2020, 2019, and 2018, are shown below (in millions): Pension Benefits Other Post-retirement Benefits Non-qualified Plan Benefits Components of Net Periodic Benefit Cost 2020 2019 2018 2020 2019 2018 2020 2019 2018 Service cost $ (0.8) $ (2.3) $ (1.8) $ (0.1) $ (0.1) $ (0.1) $ — $ (0.1) $ (0.1) Interest cost (6.5) (8.0) (7.4) (0.3) (0.4) (0.4) (0.1) (0.1) (0.1) Expected return on plan assets 6.8 7.3 8.2 — — — — — — Amortization of net loss (2.5) (4.1) (4.2) 0.1 0.1 (0.3) (0.1) — (0.1) Amortization of prior service cost — 0.6 0.5 — — — — 0.1 0.2 Curtailment gain (loss) — 1.3 — — — — — 0.1 0.6 Settlement gain (loss) — — — — — — — — (0.1) Net periodic benefit cost $ (3.0) $ (5.2) $ (4.7) $ (0.3) $ (0.4) $ (0.8) $ (0.2) $ — $ 0.4 Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Loss) Net gain (loss) $ (3.8) $ 5.2 $ (6.5) $ (3.7) $ 0.3 $ 1.4 $ (0.2) $ (0.2) $ 0.2 Amortization of net loss 1 2.5 4.1 4.2 (0.1) (0.1) 0.3 0.1 — 0.1 Prior service credit — — — — — — — — — Prior service cost (0.1) — — — — — — — — Amortization of prior service credit 1 — (0.6) (0.5) — — — — (0.1) (0.2) Curtailment gain recognition of prior service credit 1 — (1.3) — — — — — (0.1) (0.6) Recognition of settlement loss 1 — — — — — — — — 0.1 Total recognized in Other comprehensive income (loss) (1.4) 7.4 (2.8) (3.8) 0.2 1.7 (0.1) (0.4) (0.4) Total recognized in net periodic benefit cost and Other comprehensive income (loss) $ (4.4) $ 2.2 $ (7.5) $ (4.1) $ (0.2) $ 0.9 $ (0.3) $ (0.4) $ — 1 Represents amortization or recognition of balances previously recorded to Accumulated other comprehensive income (loss) in the consolidated balance sheets and recognized as a component of net periodic benefit cost.
Amounts Recognized on the Consolidated Balance Sheets and in Accumulated Other Comprehensive Loss	Amounts recognized on the consolidated balance sheets in accumulated other comprehensive income (loss) at December 31, 2020 and 2019 were as follows (in millions): Pension Benefits Other Post-retirement Benefits Non-qualified Plan Benefits 2020 2019 2020 2019 2020 2019 Net gain (loss), net of taxes $ (48.8) $ (47.4) $ (3.6) $ 0.2 $ (0.8) $ (0.8) Unrecognized prior service credit (cost), net of taxes (0.1) — — — — — Total $ (48.9) $ (47.4) $ (3.6) $ 0.2 $ (0.8) $ (0.8)
Schedule of Assumptions Used	The weighted average assumptions used to determine benefit information during 2020, 2019, and 2018 were as follows: Pension Benefits Other Post-retirement Benefits Non-qualified Plan Benefits 2020 2019 2018 2020 2019 2018 2020 2019 2018 Weighted Average Assumptions Discount rate 2.40 % 3.29 % 4.33 % 2.49 % 3.38 % 4.38 % 1.07 % 2.48 % 3.78 % Rate of compensation increase N/A 0.5%-3.0% 0.5%-3.0% 0.5%-3.0% 0.5%-3.0% 0.5%-3.0% N/A N/A N/A Expected return on plan assets 3.70 % 4.30 % 4.30 % N/A N/A N/A N/A N/A N/A Interest crediting rates 0.71 % 1.68 % 3.01 % N/A N/A N/A 0.71 % 1.68 % 3.01 % Initial health care cost trend rate N/A N/A N/A 5.70 % 6.00 % 6.20 % N/A N/A N/A Ultimate rate N/A N/A N/A 4.50 % 4.50 % 4.50 % N/A N/A N/A Year ultimate rate is reached N/A N/A N/A 2037 2037 2037 N/A N/A N/A
Schedule of Multiemployer Plans	The "FIP/RP Status Pending/Implemented" column indicates plans for which a financial improvement plan (FIP) or a rehabilitation plan (RP) is either pending or has been implemented and the "Surcharge Imposed" column represents whether the Company has paid a surcharge to the plan as of December 31, 2020. The "Expiration Date" column describes the expiration dates of the collective-bargaining agreements requiring contributions to the plan. FIP/RP Status Contribution by Entity Contribution by Entity Contribution by Entity Surcharge Imposed Expiration Date Fund EIN Pension Plan Number PPA Zone Status Pending/Implemented Jan. 1 - Dec. 31, 2020 Jan. 1 - Dec. 31, 2019 Jan. 1 - Dec. 31, 2018 Operating Engineers 94-6090764; 001 Yellow Yes $ 3.3 $ 4.1 $ 4.7 No 8/31/24 Laborers National 52-6074345; 001 Yellow Yes 0.2 0.2 0.2 No 8/31/21 Hawai‘i Laborers (GPRM) 99-6025107; 001 Green No 0.3 1.1 0.9 No N/A Hawai‘i Laborers (GPRS) 99-6025107; 001 Green No 0.2 0.2 0.2 No 9/30/24 Total $ 4.0 $ 5.6 $ 6.0

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Schedule of Components of Income Tax Expense (Benefit)	The income tax expense (benefit) on income (loss) from continuing operations for the years ended December 31, 2020, 2019 and 2018 consisted of the following (in millions): 2020 2019 2018 Current: Federal $ (0.1) $ (1.6) $ (0.3) State (0.3) (0.4) — Current $ (0.4) $ (2.0) $ (0.3) Deferred: Federal $ — $ — $ 14.0 State — — 2.6 Deferred $ — $ — $ 16.6 Income tax expense (benefit) $ (0.4) $ (2.0) $ 16.3
Schedule of Effective Income Tax Rate Reconciliation	Income tax expense (benefit) for the years ended December 31, 2020, 2019, and 2018 differs from amounts computed by applying the statutory federal rate to income from continuing operations before income taxes for the following reasons (in millions): 2020 2019 2018 Computed federal income tax expense $ 1.2 $ (8.2) $ (11.1) State income taxes (1.1) (5.1) (15.6) Valuation allowance 3.4 8.3 84.4 REIT rate differential (4.7) (7.9) (51.5) Amended return — (1.1) 0.6 Noncontrolling interest 0.1 0.5 (0.6) Impairment — 12.4 10.7 Other, net 0.7 (0.9) (0.6) Income tax expense (benefit) $ (0.4) $ (2.0) $ 16.3
Schedule of Deferred Tax Assets and Liabilities	The tax effects of temporary differences that give rise to significant portions of the deferred tax assets and deferred tax liabilities as of December 31, 2020 and 2019 were as follows (in millions): 2020 2019 Deferred tax assets: Employee benefits $ 11.5 $ 10.4 Capitalized costs 5.5 6.2 Joint ventures and other investments 42.6 49.1 Impairment and amortization 1.6 0.9 Solar investment benefits 15.7 16.7 Insurance and other reserves 6.4 3.2 Disallowed interest expense 9.1 8.4 Net operating losses 20.5 17.6 Operating lease liability 2.0 2.6 Other 3.2 3.4 Total deferred tax assets $ 118.1 $ 118.5 Valuation allowance (104.0) (99.3) Total net deferred tax assets $ 14.1 $ 19.2 Deferred tax liabilities: Property (including tax-deferred gains on real estate transactions) $ 12.2 $ 16.0 Operating lease asset 1.9 2.5 Other — 0.7 Total deferred tax liabilities $ 14.1 $ 19.2 Net deferred tax assets (liabilities) $ — $ —
Summary of Valuation Allowance	Significant management judgment is required in determining the period in which reversal of a valuation allowance should occur. The net change to the valuation allowance recorded during the years ended December 31, 2020, 2019 and 2018 were as follows (in millions): Balance at Beginning of Year Net Change Balance at End of Year 2020 $ 99.3 $ 4.7 $ 104.0 2019 $ 91.5 $ 7.8 $ 99.3 2018 $ 6.9 $ 84.6 $ 91.5

Earnings Per Share (_EPS_) (Tab

Earnings Per Share (“EPS”) (Tables)	12 Months Ended
	Dec. 31, 2020
Earnings Per Share [Abstract]
Schedule of Reconciliation of Income and Computation of Earnings per Share	The following table provides a reconciliation of income (loss) from continuing operations to income (loss) from continuing operations available to A&B shareholders and net income (loss) available to A&B shareholders for the years ended December 31, 2020, 2019 and 2018 (in millions): 2020 2019 2018 Income (loss) from continuing operations $ 6.0 $ (36.9) $ (69.2) Exclude: (Income) loss attributable to noncontrolling interest 0.4 2.0 (2.2) Income (loss) from continuing operations attributable to A&B shareholders 6.4 (34.9) (71.4) Exclude: (Increase) decrease in carrying value of redeemable non-controlling interest — — — Income (loss) from continuing operations available to A&B shareholders 6.4 (34.9) (71.4) Distributions and allocations to participating securities (0.1) (0.2) — Income (loss) from continuing operations available to A&B common shareholders 6.3 (35.1) (71.4) Income (loss) from discontinued operations available to A&B common shareholders (0.8) (1.5) (0.6) Net income (loss) available to A&B common shareholders $ 5.5 $ (36.6) $ (72.0) The number of shares used to compute basic and diluted earnings per share for the years ended December 31, 2020, 2019 and 2018 were as follows (in millions): 2020 2019 2018 Denominator for basic EPS - weighted average shares outstanding 72.3 72.2 70.6 Effect of dilutive securities: Stock options and restricted stock unit awards 0.1 — — Special Distribution — — — Denominator for diluted EPS - weighted average shares outstanding 72.4 72.2 70.6

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Loss) (Tables)	12 Months Ended
	Dec. 31, 2020
Equity [Abstract]
Schedule of Components of Accumulated Other Comprehensive Income (Loss), Net of Taxes	The components of accumulated other comprehensive loss, net of taxes, were as follows for the years ended December 31, 2020 and 2019 (in millions): 2020 2019 Employee benefit plans: Pension plans $ (48.9) $ (47.4) Post-retirement plans (3.6) 0.2 Non-qualified benefit plans (0.8) (0.8) Total employee benefit plans (53.3) (48.0) Interest rate swap (6.7) (0.8) Accumulated other comprehensive income (loss) $ (60.0) $ (48.8) The changes in accumulated other comprehensive income (loss) by component for the years ended December 31, 2020, 2019 and 2018 were as follows (in millions, net of tax): Employee Benefit Plans Interest Rate Swap Total Balance, January 1, 2018 $ (44.2) $ 1.9 $ (42.3) Other comprehensive income (loss) before reclassifications, net of taxes of $0 (4.9) 1.0 (3.9) Amounts reclassified from accumulated other comprehensive income (loss), net of taxes of $0 3.4 — 3.4 Impact of adoption of ASU 2018-02 (9.5) 0.4 (9.1) Balance, December 31, 2018 $ (55.2) $ 3.3 $ (51.9) Other comprehensive income (loss) before reclassifications, net of taxes of $0 5.3 (4.0) 1.3 Amounts reclassified from accumulated other comprehensive income (loss), net of taxes of $0 1.9 (0.1) 1.8 Balance, December 31, 2019 $ (48.0) $ (0.8) $ (48.8) Other comprehensive income (loss) before reclassifications, net of taxes of $0 (7.7) (6.9) (14.6) Amounts reclassified from accumulated other comprehensive income (loss), net of taxes of $0 2.4 1.0 3.4 Balance, December 31, 2020 $ (53.3) $ (6.7) $ (60.0)
Schedule of Reclassification out of Accumulated Other Comprehensive Income (Loss)	The reclassifications of other comprehensive income (loss) components out of accumulated other comprehensive income (loss) for the years ended December 31, 2020, 2019 and 2018 were as follows (in millions): 2020 2019 2018 Unrealized interest rate hedging gain (loss) $ (6.9) $ (4.0) $ 1.0 Actuarial loss (7.7) 5.3 (4.9) Impact of reclassification adjustment to interest expense included in Net Income (Loss) 1.0 (0.1) — Amortization of defined benefit pension items reclassified to net periodic pension cost: Net loss* 2.5 4.0 4.6 Prior service cost* (0.1) — — Prior service credit* — (0.7) (0.7) Curtailment (gain)/loss* — (1.4) (0.6) Settlement (gain)/loss* — — 0.1 Total before income tax $ (11.2) $ 3.1 $ (0.5) Income taxes — — — Other comprehensive income (loss), net of tax $ (11.2) $ 3.1 $ (0.5) * This accumulated other comprehensive income (loss) component is included in the computation of net periodic pension cost (refer to Note 17).

Segment Results (Tables)

Segment Results (Tables)	12 Months Ended
	Dec. 31, 2020
Segment Reporting [Abstract]
Schedule of Operating Segment Information	Operating segment information for the years ended December 31, 2020, 2019 and 2018 is summarized below (in millions): 2020 2019 2018 Operating Revenue: Commercial Real Estate $ 150.0 $ 160.6 $ 140.3 Land Operations 40.6 114.1 289.5 Materials & Construction 114.7 160.5 214.6 Total operating revenue 305.3 435.2 644.4 Operating Profit (Loss): Commercial Real Estate 1 49.8 66.2 58.5 Land Operations 2 17.3 20.8 (26.7) Materials & Construction 3 (12.4) (69.2) (73.2) Total operating profit (loss) 54.7 17.8 (41.4) Gain (loss) on disposal of commercial real estate properties, net 0.5 — 51.4 Interest expense (30.3) (33.1) (35.3) General corporate expenses (19.3) (23.6) (27.6) Income (Loss) from Continuing Operations Before Income Taxes $ 5.6 $ (38.9) $ (52.9) Identifiable Assets: Commercial Real Estate $ 1,499.9 $ 1,532.6 $ 1,530.4 Land Operations 4 258.4 282.5 350.0 Materials & Construction 211.9 243.0 297.1 Other 65.8 26.2 47.7 Total assets $ 2,036.0 $ 2,084.3 $ 2,225.2 Capital Expenditures: Commercial Real Estate 5 $ 18.8 $ 250.5 $ 282.7 Land Operations 6 1.4 2.3 1.4 Materials & Construction 4.5 1.9 11.0 Other 0.4 0.4 1.0 Total capital expenditures $ 25.1 $ 255.1 $ 296.1 Depreciation and Amortization: Commercial Real Estate $ 40.1 $ 36.7 $ 28.0 Land Operations 1.5 1.6 1.9 Materials & Construction 10.8 11.4 12.1 Other 0.9 0.8 0.8 Total depreciation and amortization $ 53.3 $ 50.5 $ 42.8 1 Commercial Real Estate segment operating profit (loss) includes intersegment operating revenue, primarily from the Materials & Construction segment, and is eliminated in the consolidated results of operations. 2 Land Operations segment operating profit (loss) includes equity in earnings (losses) from the Company's various real estate joint ventures and non-cash reductions related to the Company's solar tax equity investments. The year ended December 31, 2018 also includes a non-cash, other-than-temporary impairment of $186.8 million recorded against the Company's investment in Kukui‘ula. 3 Materials & Construction segment operating profit (loss) for the year ended December 31, 2020 includes an impairment charge of $5.6 million related to its disposal of GPRM. Materials & Construction segment operating profit (loss) for the December 31, 2019 includes an impairment charge related to its goodwill of $49.7 million. Materials & Construction segment operating profit (loss) for the December 31, 2018 includes cumulative impairment charges related to long-lived assets, finite-lived intangible assets and goodwill of $77.8 million. 4 The Land Operations segment includes assets related to its investment in various real estate joint ventures. 5 Represents gross capital additions to the commercial real estate portfolio, including gross tax deferred property purchases but excluding the assumption of debt, that are reflected as non-cash transactions in the consolidated statements of cash flows. 6 Excludes expenditures for real estate developments held for sale, which are classified as cash flows from operating activities within the consolidated statements of cash flows, and excludes investment in joint ventures classified as cash flows from investing activities.

Long-lived Assets - Impairmen_2

Long-lived Assets - Impairments, Held for Sale or Disposals (Tables)	12 Months Ended
	Dec. 31, 2020
Discontinued Operations and Disposal Groups [Abstract]
Long-lived Assets - Impairments of Assets Held and Used	Changes to Materials & Construction fixed assets and intangible assets for the year ended December 31, 2018 including such impairments were as follows (in millions): Intangible Assets Materials & Construction Fixed Assets Materials & Construction Balance, January 1, 2018 $ 16.5 Balance, January 1, 2018 $ 139.5 Additions to intangible assets — Additions to fixed assets 11.1 Amortization (0.9) Depreciation (11.2) Intangible impairment (7.0) Fixed asset impairment (33.6) Balance, December 31, 2018 $ 8.6 Balance, December 31, 2018 $ 105.8

Background and Basis of Prese_2

Background and Basis of Presentation (Details) ft² in Millions, $ in Millions	Dec. 17, 2018a	Dec. 31, 2020aft²propertysegment	Dec. 31, 2019USD ($)a	Dec. 31, 2018USD ($)	Feb. 28, 2019a
Real Estate [Line Items]
Number of operating segments | segment		3
Gross leasable area (in sq ft) | ft²		3.9
Area of ground leases owned (in acres) | a		153.8
Maui | Mahi Pono Holdings, LLC | Not Discontinued Operations
Real Estate [Line Items]
Gross profit | $			$ 6.7	$ 162.2
Area of land sold (acres) | a	41,000		41,000		800
GPRM Prestress, LLC
Real Estate [Line Items]
Ownership interest percentage in subsidiaries		51.00%
GLP Alphalt, LLC
Real Estate [Line Items]
Ownership interest percentage in subsidiaries		70.00%
Maui Diversified Agriculture | Maui | Not Discontinued Operations
Real Estate [Line Items]
Ownership interest held (percent)	100.00%
Retail
Real Estate [Line Items]
Company's CRE improved real estate assets		22
Industrial Properties
Real Estate [Line Items]
Company's CRE improved real estate assets		10
Office
Real Estate [Line Items]
Company's CRE improved real estate assets		4

Significant Accounting Polici_4

Significant Accounting Policies - Schedule of Estimated Useful Lives of Property (Details)	12 Months Ended
	Dec. 31, 2020
Building and improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives of property	10 years
Building and improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives of property	40 years
Leasehold improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives of property	5 years
Leasehold improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives of property	10 years
Water, power and sewer systems | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives of property	5 years
Water, power and sewer systems | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives of property	50 years
Asphalt plants, machinery and equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives of property	2 years
Asphalt plants, machinery and equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives of property	35 years
Other property improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives of property	3 years
Other property improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives of property	35 years

Significant Accounting Polici_5

Significant Accounting Policies - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020USD ($)segment	Dec. 31, 2019USD ($)	Jan. 01, 2020USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Number of operating segments | segment	3
Accounting Standards Update [Extensible List]		us-gaap:AccountingStandardsUpdate201613Member
Net decrease to total equity	$ (1,096.1)	$ (1,128.7)		$ (1,208.3)	$ (651.1)
Impact of adoption of new accounting standards
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net decrease to total equity		$ 4.1			$ 1.4
Impact of adoption of new accounting standards | ASU 2016-13
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net decrease to total equity			$ 4.1
GLP
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Ownership interest percentage in subsidiaries	70.00%

Significant Accounting Polici_6

Significant Accounting Policies - Schedule of Interest and Other Income (Expense), Net (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounting Policies [Abstract]
Pension and postretirement benefit (expense)	$ (2.6)	$ (3.1)	$ (3)
Interest income	1.7	3	1.5
Gain (loss) on sale of joint venture interest	0	2.6	4.2
Reductions in solar investments, net	0	(0.1)	(0.5)
Other income (expense)	1.2	0.8	0.1
Interest and other income (expense), net	$ 0.3	$ 3.2	$ 2.3

Significant Accounting Polici_7

Significant Accounting Policies - Impact of ASC 326 (Details) - USD ($) $ in Millions	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses on Accounts receivable and retention	$ 3.3	$ 0.3	$ 0.6
Allowance for credit losses on Other receivables		1.6
Allowance for credit losses on cost and estimated earnings in excess of billings on uncompleted contracts		0
Total		1.9
As Reported under ASC 326
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses on Accounts receivable and retention		1.6
Allowance for credit losses on Other receivables		4.3
Allowance for credit losses on cost and estimated earnings in excess of billings on uncompleted contracts		0.1
Total		6
Impact of adoption of new accounting standards | ASU 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses on Accounts receivable and retention		1.3
Allowance for credit losses on Other receivables		2.7
Allowance for credit losses on cost and estimated earnings in excess of billings on uncompleted contracts		0.1
Total		$ 4.1

Real Estate Property, Net and_3

Real Estate Property, Net and Other Property, Net (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Leased property - real estate	$ 1,549.7	$ 1,540.2
Accumulated depreciation	(154.4)	(127.5)
Real estate property, net	1,395.3	1,412.7
Other property	188.3	201
Accumulated depreciation	(77.5)	(76.6)
Other property, net	110.8	124.4
Land
Property, Plant and Equipment [Line Items]
Leased property - real estate	769.6	768.8
Other property	39.3	38.4
Buildings
Property, Plant and Equipment [Line Items]
Leased property - real estate	696	692.4
Other property	18.5	19.7
Asphalt plants, machinery and equipment
Property, Plant and Equipment [Line Items]
Other property	104.4	105.5
Water, power and sewer systems
Property, Plant and Equipment [Line Items]
Other property	19.7	30.6
Other property improvements
Property, Plant and Equipment [Line Items]
Leased property - real estate	84.1	79
Other property	$ 6.4	$ 6.8

Real Estate Property, Net and_4

Real Estate Property, Net and Other Property, Net - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Abstract]
Interest costs incurred	$ 30.6	$ 34.1	$ 35.9
Capitalized interest costs	0.3	1	0.6
Depreciation expense	$ 38.8	$ 35.6	$ 32.5

Acquisitions and Intangible A_3

Acquisitions and Intangible Assets, Net (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019USD ($)property	Dec. 31, 2018USD ($)property	Dec. 31, 2020USD ($)
Real Estate [Line Items]
Property and improvements	$ 1,412.7		$ 1,395.3
Total assets	2,084.3	$ 2,225.2	2,036
Long-term Debt	704.6		687.1
Total liabilities	949.3		$ 933.4
Hawaii | 2019 Acquisitions
Real Estate [Line Items]
Purchase consideration	218.4
Land	106.9
Property and improvements	91.3
In-place leases	23.2
Favorable leases	4.3
Total assets	225.7
Unfavorable leases	7.3
Total liabilities	7.3
Net assets acquired	$ 218.4
Hawaii | 2019 Acquisitions | In-place leases
Real Estate [Line Items]
Weighted average amortization periods	8 years 2 months 12 days
Hawaii | 2019 Acquisitions | Favorable leases
Real Estate [Line Items]
Weighted average amortization periods	4 years 8 months 12 days
Hawaii | 2019 Acquisitions | Favorable leases
Real Estate [Line Items]
Unfavorable lease, weighted average useful life (in years)	18 years 7 months 6 days
Hawaii | 2018 Acquisitions
Real Estate [Line Items]
Debt assumed		62
Capitalized acquisition costs		2.7
Land		92.8
Property and improvements		173.9
In-place leases		32
Favorable leases		6.7
Total assets		305.4
Unfavorable leases		2.7
Long-term Debt		61
Total liabilities		63.7
Net assets acquired		241.7
Fair value adjustment		$ 1
Hawaii | 2018 Acquisitions | In-place leases
Real Estate [Line Items]
Weighted average amortization periods		12 years 4 months 24 days
Hawaii | 2018 Acquisitions | Favorable leases
Real Estate [Line Items]
Weighted average amortization periods		11 years 8 months 12 days
Hawaii | 2018 Acquisitions | Favorable leases
Real Estate [Line Items]
Unfavorable lease, weighted average useful life (in years)		11 years 6 months
Hawaii | Commercial property | 2019 Acquisitions
Real Estate [Line Items]
Number of commercial properties acquired | property	5
Hawaii | Commercial property | 2018 Acquisitions
Real Estate [Line Items]
Number of commercial properties acquired | property		5
Purchase consideration		$ 303.7
Number of properties sold used to fund the acquisitions | property		7

Acquisitions and Intangible A_4

Acquisitions and Intangible Assets, Net - Schedule of Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Total assets	$ 61.9	$ 74.9
Other intangible assets	20.4	20.2
Other intangible assets, net	10.2	12.3
Amortization of intangible assets	14.5	12.5	$ 8.7
In-place leases
Finite-Lived Intangible Assets [Line Items]
Amortized intangible assets:	125	125.2
Accumulated amortization	(73.8)	(63.4)
Favorable leases
Finite-Lived Intangible Assets [Line Items]
Amortized intangible assets:	29	29
Accumulated amortization	(18.3)	(15.9)
Other Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Accumulated amortization	$ (10.2)	$ (7.9)

Acquisitions and Intangible A_5

Acquisitions and Intangible Assets, Net - Schedule of Estimated Amortization Expenses Related to Intangible Assets (Details) $ in Millions	Dec. 31, 2020USD ($)
Property, Plant and Equipment [Abstract]
2021	$ 11.5
2022	9.1
2023	8.1
2024	5.8
2025	$ 5.4

Investments in Affiliates - Nar

Investments in Affiliates - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Investment in various real estate joint ventures		$ 169.6	$ 167.6
Undistributed earnings of investments in affiliates		10.6	9.2
Dividends and distributions from unconsolidated affiliates		6.1	12.4	$ 51.1
Impairment of equity method investment	$ 188.6	0	0	$ 188.6
Kukui'iula
Schedule of Equity Method Investments [Line Items]
Investment in various real estate joint ventures		$ 118.7	$ 116.2
Equity method ownership percentage (in percent)		62.00%
Kukui'iula | Weighted average discount rate
Schedule of Equity Method Investments [Line Items]
Weighted average discount rate (percent)	18.00%			18.00%

Investments in Affiliates - Sum

Investments in Affiliates - Summary of Financial Information for Equity Method Investments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Balance Sheet
Total assets	$ 2,036	$ 2,084.3	$ 2,225.2
Total liabilities	933.4	949.3
Income Statement
Revenue	305.3	435.2	644.4
Operating costs and expenses	285.2	449.5	523
Income (loss) from Continuing Operations	5.6	(38.9)	(52.9)
Net income (loss)	5.6	(36.4)	(72)
Equity Method Investments
Balance Sheet
Current assets	73	79.3
Non-current assets	688	697.9
Total assets	761	777.2
Current liabilities	33.5	27.1
Non-current liabilities	96.7	109
Total liabilities	130.2	136.1
Income Statement
Revenue	174.2	191.9	243.6
Operating costs and expenses	147.1	173	209.7
Gross profit (loss)	27.1	18.9	33.9
Income (loss) from Continuing Operations	12.1	6.6	17.4
Net income (loss)	$ 11.6	$ 6.6	$ 16.5

Allowance and Other Reserves -

Allowance and Other Reserves - Balances and Activity of Allowance and Reserve (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of year	$ 1.6
Balance at end of year	3.9	$ 1.6
Reserve for cash basis tenants
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of year	0.9	0
Additions	10.6	0
Deductions or other	1.2	0.9
Balance at end of year	12.7	0.9	$ 0
Allowance for doubtful accounts
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of year	0.6	2	1.4
Additions	3.6	(0.4)	1.3
Deductions or other	(1.3)	(1)	(0.7)
Balance at end of year	2.6	0.6	2
Allowance for doubtful accounts | Impact of adoption of new accounting standards
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of year	(0.3)
Balance at end of year		(0.3)
Reserve for contract credits
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of year	2.3	0
Additions	0	2.3
Deductions or other	0	0
Balance at end of year	2.3	2.3	0
Allowance for credit losses - financing receivables
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of year	0
Additions	(0.4)
Deductions or other	0
Balance at end of year	3.9	0
Allowance for credit losses - financing receivables | Impact of adoption of new accounting standards
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of year	1.6
Balance at end of year		1.6
Allowance for credit losses - financing receivables | Impact of adoption of new accounting standards | (Distribution in Excess of Accumulated Earnings) Earnings Surplus
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of year	2.7
Balance at end of year		2.7
Allowance for credit losses - contract assets
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of year	0
Additions	(0.9)
Deductions or other	(0.1)
Balance at end of year	0.7	0
Allowance for credit losses - contract assets | Impact of adoption of new accounting standards
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of year	0.3
Balance at end of year		0.3
Allowance for credit losses - contract assets | Impact of adoption of new accounting standards | (Distribution in Excess of Accumulated Earnings) Earnings Surplus
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of year	1.4
Balance at end of year		1.4
Loans allowance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of year	1.6	1.6	1.6
Additions	0	0	0
Deductions or other	0	0	0
Balance at end of year	0	1.6	1.6
Loans allowance | Impact of adoption of new accounting standards
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of year	(1.6)
Balance at end of year		(1.6)
Other reserves
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of year	0.4	0.4	0.4
Additions	0	0	0
Deductions or other	(0.4)	0	0
Balance at end of year	$ 0	$ 0.4	$ 0.4

Allowance and Other Reserves _2

Allowance and Other Reserves - Narrative (Details) $ in Millions	Dec. 31, 2020USD ($)asset	Jan. 01, 2020USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]
Number of assets | asset	3
Land Operations | First security, generated in 2008
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost basis of financing receivable	$ 1.6	$ 1.6
Land Operations | Second security, generated in 2016
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost basis of financing receivable	11.1	13.5
Land Operations | Third security, generated in 2017
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost basis of financing receivable	$ 2.7	$ 2.6

Inventories (Details)

Inventories (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Inventory [Line Items]
Inventories	$ 18.4	$ 20.7
Asphalt
Inventory [Line Items]
Inventories	4.2	8
Processed rock and sand
Inventory [Line Items]
Inventories	7.9	6.6
Work in progress
Inventory [Line Items]
Inventories	3.2	2.9
Retail merchandise
Inventory [Line Items]
Inventories	2.1	2
Parts, materials and supplies inventories
Inventory [Line Items]
Inventories	$ 1	$ 1.2

Goodwill (Details)

Goodwill (Details) $ in Millions	3 Months Ended		12 Months Ended
	Sep. 30, 2019USD ($)reportingUnit	Dec. 31, 2018USD ($)	Dec. 31, 2019USD ($)reportingUnit	Dec. 31, 2020USD ($)
Goodwill [Line Items]
Goodwill		$ 65.1	$ 15.4	$ 10.5
Goodwill impairment	$ 49.7	$ 37.2	$ 49.7
Weighted average discount rate | Discounted cash flow analysis
Goodwill [Line Items]
Weighted average discount rate (percent)		13.60%	12.70%
Materials and Construction Segment
Goodwill [Line Items]
Goodwill		$ 56.4	$ 6.7	$ 1.8
Number of Reporting Units | reportingUnit	3		3
Goodwill impairment			$ 49.7

Goodwill - Schedule of Goodwill

Goodwill - Schedule of Goodwill (Details) - USD ($)	3 Months Ended		12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018	Dec. 31, 2020	Dec. 31, 2019
Goodwill [Roll Forward]
Gross amount of goodwill			$ 102,300,000	$ 102,300,000
Accumulated impairment losses			(86,900,000)	(37,200,000)
Goodwill, Beginning Balance			15,400,000	65,100,000
Impairment losses	$ (49,700,000)	$ (37,200,000)		(49,700,000)
Gross amount of goodwill included in disposal			(7,100,000)
Accumulated impairment losses included in disposal			2,200,000
Gross amount of goodwill		102,300,000	95,200,000	102,300,000
Accumulated impairment losses		(37,200,000)	(84,700,000)	(86,900,000)
Goodwill, Ending Balance		65,100,000	10,500,000	15,400,000
Materials and Construction Segment
Goodwill [Roll Forward]
Gross amount of goodwill			93,600,000	93,600,000
Accumulated impairment losses			(86,900,000)	(37,200,000)
Goodwill, Beginning Balance			6,700,000	56,400,000
Impairment losses				(49,700,000)
Gross amount of goodwill included in disposal			(7,100,000)
Accumulated impairment losses included in disposal			2,200,000
Gross amount of goodwill		93,600,000	86,500,000	93,600,000
Accumulated impairment losses		(37,200,000)	(84,700,000)	(86,900,000)
Goodwill, Ending Balance		56,400,000	1,800,000	6,700,000
Commercial property
Goodwill [Roll Forward]
Gross amount of goodwill			8,700,000	8,700,000
Accumulated impairment losses			0	0
Goodwill, Beginning Balance			8,700,000	8,700,000
Impairment losses				0
Gross amount of goodwill included in disposal			0
Accumulated impairment losses included in disposal			0
Gross amount of goodwill		8,700,000	8,700,000	8,700,000
Accumulated impairment losses		0	0	0
Goodwill, Ending Balance		$ 8,700,000	8,700,000	$ 8,700,000
Land Operations
Goodwill [Roll Forward]
Goodwill, Ending Balance			$ 0

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of goodwill and other long-lived assets		$ 5.6	$ 49.7	$ 79.4
Non-cash reduction in equity method investments	$ 188.6	0	0	$ 188.6
Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of notes		11.5	15.7
Company's debt		687.1	704.6
Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of notes		11.5	15.7
Company's debt		$ 704.1	$ 727.3

Notes Payable and Other Debt -

Notes Payable and Other Debt - Schedule of Notes Payable and Long-term Debt (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Nov. 30, 2017	Mar. 31, 2017
Debt Instrument [Line Items]
Total Debt (contractual)	$ 687.3	$ 705.2
Unamortized debt premium (discount)	0	(0.1)
Unamortized debt issuance costs	(0.2)	(0.5)
Total debt (carrying value)	687.1	704.6
Secured debt
Debt Instrument [Line Items]
Total Debt (contractual)	218.1	223.3
Total debt (carrying value)	218
Secured debt | Kailua Town Center
Debt Instrument [Line Items]
Total Debt (contractual)	$ 9.8	10.2
Fixed interest rate (percent)	5.95%
Secured debt | Kailua Town Center | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.50%
Secured debt | Kailua Town Center #2
Debt Instrument [Line Items]
Stated interest rate				3.15%		3.15%
Total Debt (contractual)	$ 4.5	4.6
Secured debt | Heavy Equipment Financing
Debt Instrument [Line Items]
Total Debt (contractual)	$ 3.2	3.6
Weighted average interest rate (percent)	3.00%
Secured debt | Laulani Village
Debt Instrument [Line Items]
Stated interest rate	3.93%
Total Debt (contractual)	$ 61.3	62
Secured debt | Pearl Highlands
Debt Instrument [Line Items]
Stated interest rate	4.15%
Total Debt (contractual)	$ 81.4	83.4
Secured debt | Manoa Marketplace
Debt Instrument [Line Items]
Total Debt (contractual)	$ 57.9	59.5
Fixed interest rate (percent)	3.14%
Secured debt | Manoa Marketplace | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.35%
Unsecured debt
Debt Instrument [Line Items]
Total Debt (contractual)	$ 358.2	383.2
Total debt (carrying value)	$ 358.1
Unsecured debt | Series D Note
Debt Instrument [Line Items]
Stated interest rate	0.00%
Total Debt (contractual)	$ 0	16.2
Unsecured debt | Bank syndicated loan
Debt Instrument [Line Items]
Total Debt (contractual)	$ 50	50
Fixed interest rate (percent)	3.35%
Unsecured debt | Bank syndicated loan | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	2.00%
Unsecured debt | Series A Note
Debt Instrument [Line Items]
Stated interest rate	5.53%
Total Debt (contractual)	$ 28.4	28.5
Unsecured debt | Series J Note
Debt Instrument [Line Items]
Stated interest rate	4.66%
Total Debt (contractual)	$ 10	10
Unsecured debt | Series B Note
Debt Instrument [Line Items]
Stated interest rate	5.55%
Total Debt (contractual)	$ 46	46
Unsecured debt | Series C Note
Debt Instrument [Line Items]
Stated interest rate	5.56%
Total Debt (contractual)	$ 22	23
Unsecured debt | Series F Note
Debt Instrument [Line Items]
Stated interest rate	4.35%
Total Debt (contractual)	$ 19.7	22
Unsecured debt | Series H Note
Debt Instrument [Line Items]
Stated interest rate	4.04%
Total Debt (contractual)	$ 50	50
Unsecured debt | Series K Note
Debt Instrument [Line Items]
Stated interest rate	4.81%
Total Debt (contractual)	$ 34.5	34.5
Unsecured debt | Series G Note
Debt Instrument [Line Items]
Stated interest rate	3.88%
Total Debt (contractual)	$ 29.6	35
Unsecured debt | Series L Note
Debt Instrument [Line Items]
Stated interest rate	4.89%
Total Debt (contractual)	$ 18	18
Unsecured debt | Series I Note
Debt Instrument [Line Items]
Stated interest rate	4.16%
Total Debt (contractual)	$ 25	25
Unsecured debt | Term Loan 5
Debt Instrument [Line Items]
Stated interest rate	4.30%				4.30%
Total Debt (contractual)	$ 25	25	$ 25		$ 25
Revolving Credit Facility
Debt Instrument [Line Items]
Total Debt (contractual)	111	98.7
Total debt (carrying value)	111
Revolving Credit Facility | GLP Asphalt revolving credit facility
Debt Instrument [Line Items]
Total Debt (contractual)	$ 0	0
Revolving Credit Facility | GLP Asphalt revolving credit facility | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.25%
Revolving Credit Facility | A&B Revolver
Debt Instrument [Line Items]
Total Debt (contractual)	$ 111	$ 98.7
Revolving Credit Facility | A&B Revolver | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	2.05%

Notes Payable and Other Debt _2

Notes Payable and Other Debt - Narrative (Details)

Nov. 30, 2015USD ($)

Dec. 01, 2014USD ($)

Sep. 30, 2018

Feb. 28, 2018USD ($)

Sep. 30, 2017USD ($)

Dec. 31, 2020USD ($)

Dec. 31, 2018USD ($)

Dec. 31, 2016USD ($)

Dec. 31, 2019USD ($)

Aug. 31, 2018USD ($)

Mar. 31, 2018

Dec. 31, 2017USD ($)

Nov. 30, 2017USD ($)

Aug. 31, 2017

Mar. 31, 2017USD ($)

Dec. 31, 2015USD ($)

Dec. 20, 2013USD ($)

Sep. 17, 2013USD ($)

Debt Instrument [Line Items]

Total debt

$ 687,300,000

$ 705,200,000

Collateral amount

375,500,000

Wells Fargo Term Facility

Debt Instrument [Line Items]

Maximum borrowing capacity

$ 50,000,000

Borrowings (payments) on line-of-credit agreement, net

$ 50,000,000

Cash Flow Hedging | Designated as Hedging Instrument | Other Assets | Interest Rate Swap

Debt Instrument [Line Items]

Fixed interest rate (percent)

3.14%

Pearl City

Debt Instrument [Line Items]

Long term debt acquired

$ 59,300,000

Secured debt

Debt Instrument [Line Items]

Total debt

$ 218,100,000

223,300,000

Secured debt | Kailua Town Center

Debt Instrument [Line Items]

Face amount

$ 12,000,000

Fixed interest rate (percent)

5.95%

Total debt

$ 9,800,000

10,200,000

Secured debt | Kailua Town Center | LIBOR

Debt Instrument [Line Items]

Basis spread on variable rate

1.50%

Secured debt | Kailua Town Center #2

Debt Instrument [Line Items]

Face amount

$ 5,000,000

Total debt

$ 4,500,000

4,600,000

Stated interest rate

3.15%

3.15%

Secured debt | Mortgage Secured by Laulani Village

Debt Instrument [Line Items]

Face amount

$ 62,000,000

Stated interest rate

3.93%

Interest only payments, amount

$ 200,000

Principal and interest payment, amount

300,000

Secured debt | Refinanced Loan, Maturity 2024

Debt Instrument [Line Items]

Face amount

$ 92,000,000

Stated interest rate

4.15%

Principal and interest payment, amount

$ 400,000

Balloon payment to be paid

$ 73,000,000

Secured debt | LIBOR plus 1.35%, payable through 2029, secured by Manoa Marketplace

Debt Instrument [Line Items]

Face amount

$ 60,000,000

Balloon payment to be paid

$ 41,700,000

Secured debt | LIBOR plus 1.35%, payable through 2029, secured by Manoa Marketplace | LIBOR

Debt Instrument [Line Items]

Basis spread on variable rate

1.35%

Unsecured debt

Debt Instrument [Line Items]

Total debt

358,200,000

383,200,000

Unsecured debt | Prudential Notes

Debt Instrument [Line Items]

Maximum borrowing capacity

$ 450,000,000

Unsecured debt | Pru Amendment

Debt Instrument [Line Items]

Covenant compliance, debt to total assets ratio

0.35

Increase (decrease) in interest rate (percent)

0.20%

Unsecured debt | Term Loan 5

Debt Instrument [Line Items]

Total debt

$ 25,000,000

$ 25,000,000

25,000,000

$ 25,000,000

Stated interest rate

4.30%

4.30%

Revolving Credit Facility

Debt Instrument [Line Items]

Total debt

$ 111,000,000

98,700,000

Long-term line of credit

111,000,000

Letters of credit outstanding, amount

1,100,000

Remaining borrowing capacity

337,900,000

Revolving Credit Facility | GLP Asphalt revolving credit facility

Debt Instrument [Line Items]

Face amount

$ 30,000,000

$ 30,000,000

Total debt

$ 0

$ 0

Covenant compliance, debt to total assets ratio

0.6

0.5

Increase (decrease) in interest rate (percent)

(0.25%)

Unused capacity fee (percent)

0.20%

Aggregate maximum amount of priority debt

25.00%

20.00%

Covenant compliance, minimum shareholders' equity amount

$ 850,600,000

Ownership interest held (percent)

75.00%

Revolving Credit Facility | GLP Asphalt revolving credit facility | LIBOR

Debt Instrument [Line Items]

Basis spread on variable rate

1.25%

A&B Revolver | Revolving Credit Facility

Debt Instrument [Line Items]

Maximum borrowing capacity

$ 350,000,000

$ 450,000,000

Line of credit facility, term

5 years

Uncommitted increase option

$ 100,000,000

Sub limit for the issuance of standby and commercial letters of credit

100,000,000

Sub limit for swing line loans

$ 80,000,000

Letters of credit outstanding, amount

$ 1,100,000

Notes Payable and Other Debt _3

Notes Payable and Other Debt - Schedule of Debt Principal Payments (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
2021	$ 43.5
2022	141.1
2023	84.5
2024	156.9
2025	40.2
There- after	221.1
Total Debt (contractual)	687.3	$ 705.2
(Unamort Debt Issue Cost)/ (Discount) Premium	(0.2)
Total debt (carrying value)	687.1	704.6
Secured debt
Debt Instrument [Line Items]
2021	20.4
2022	6
2023	5.9
2024	134.9
2025	1.9
There- after	49
Total Debt (contractual)	218.1	223.3
(Unamort Debt Issue Cost)/ (Discount) Premium	(0.1)
Total debt (carrying value)	218
Unsecured debt
Debt Instrument [Line Items]
2021	23.1
2022	24.1
2023	78.6
2024	22
2025	38.3
There- after	172.1
Total Debt (contractual)	358.2	383.2
(Unamort Debt Issue Cost)/ (Discount) Premium	(0.1)
Total debt (carrying value)	358.1
Revolving Credit Facility
Debt Instrument [Line Items]
2021	0
2022	111
2023	0
2024	0
2025	0
There- after	0
Total Debt (contractual)	111	$ 98.7
(Unamort Debt Issue Cost)/ (Discount) Premium	0
Total debt (carrying value)	$ 111

Derivative Instruments - Cash F

Derivative Instruments - Cash Flow Hedges of Interest Rate Swaps (Details) - Accrued and other liabilities - Cash Flow Hedging - Designated as Hedging Instrument - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Interest rate Swap Maturing 2029
Derivative [Line Items]
Interest Rate	3.14%
Notional amount	$ 57.9
Fair value of interest rate swap liability	$ (4.8)	$ (0.2)
Interest Rate Swap Maturing 2023
Derivative [Line Items]
Interest Rate	3.35%
Notional amount	$ 50
Fair value of interest rate swap liability	$ (1.3)

Derivative Instruments - Deriva

Derivative Instruments - Derivative Instruments in Designated Cash Flow Hedging Relationships (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Derivative [Line Items]
Amount of gain (loss) recognized in OCI on derivatives	$ (6.9)	$ (4)	$ 1
Impact of reclassification adjustment to interest expense included in Net Income (Loss)	(1)	0.1	$ 0
Cash Flow Hedging
Derivative [Line Items]
Net gains (losses) on derivative instruments expected to be reclassified from accumulated other comprehensive income in next 12 months	1.6
Cash Flow Hedging | Designated as Hedging Instrument
Derivative [Line Items]
Amount of gain (loss) recognized in OCI on derivatives	(6.9)	(4)
Impact of reclassification adjustment to interest expense included in Net Income (Loss)	$ 1	$ (0.1)

Derivative Instruments - Non-de

Derivative Instruments - Non-designated Hedges Interest Rate Swaps (Details)	12 Months Ended
	Dec. 31, 2020USD ($)agreement	Dec. 31, 2019USD ($)
Derivative [Line Items]
Amount of gain recognized related to changes in fair value	$ 200,000	$ 0
Not Designated as Hedging Instrument | Interest Rate Swap - Maturing Sep 2021 | Accrued and other liabilities
Derivative [Line Items]
Number of interest rate swap agreements | agreement	1
Interest Rate	5.95%
Notional amount	$ 9,800,000
Fair value of interest rate swap liability	$ (300,000)	$ (500,000)

Commitments and Contingencies -

Commitments and Contingencies - Narrative (Details) a in Thousands, gal in Millions, $ in Millions	Oct. 11, 2019license	Jan. 07, 2019gal	Apr. 10, 2015plaintiff	May 31, 2016	Dec. 31, 2015plaintiff	Jan. 31, 2019	Dec. 31, 2020USD ($)	Dec. 31, 2018alicense
EMI
Loss Contingencies [Line Items]
Ownership interest held (percent)						50.00%
EMI | Maui
Loss Contingencies [Line Items]
Area of land sold (acres) | a								41
EMI | East Maui
Loss Contingencies [Line Items]
Watershed lands owned (in acres) | a								16
State of Hawaii | East Maui
Loss Contingencies [Line Items]
Number of water licenses held and extended as revocable permits | license								4
Additional watershed lands accessible by licenses (in acres) | a								30
Financial Guarantee
Loss Contingencies [Line Items]
Guarantor obligations, current carrying value							$ 0
Bonds related to real estate and construction
Loss Contingencies [Line Items]
Possible administrative penalty							258.6
Bid, Performance and Payment Bonds and Commercial Bonds
Loss Contingencies [Line Items]
Estimated remaining exposure							59.2
Long Term Water Lease Request
Loss Contingencies [Line Items]
Number of water licenses held and extended as revocable permits | license	4
Number of parties filed lawsuit | plaintiff			3		3
Duration of revocable permits for disposition of water rights	1 year			3 years
Sierra Club Lawsuit Against BLNR, A&B, and EMI
Loss Contingencies [Line Items]
Number of gallons per day sought to be enjoined (gallons) | gal		25
Maximum | Bonds related to real estate and construction
Loss Contingencies [Line Items]
Possible administrative penalty							277.9
Revolving Credit Facility | A&B Revolver
Loss Contingencies [Line Items]
Letters of credit outstanding, amount							$ 1.1

Revenue and Contract Balances -

Revenue and Contract Balances - Disaggregation of Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Total operating revenue	$ 305.3	$ 435.2	$ 644.4
Development sales revenue
Disaggregation of Revenue [Line Items]
Land operations revenues	7.9	57.2	54.3
Unimproved/other property sales revenue
Disaggregation of Revenue [Line Items]
Land operations revenues	9.7	32.4	210.5
Other operating revenue
Disaggregation of Revenue [Line Items]
Land operations revenues	23	24.5	24.7
Commercial Real Estate
Disaggregation of Revenue [Line Items]
Commercial Real Estate	150	160.6	140.3
Land Operations
Disaggregation of Revenue [Line Items]
Land operations revenues	40.6	114.1	289.5
Materials & Construction
Disaggregation of Revenue [Line Items]
Land operations revenues	$ 114.7	$ 160.5	$ 214.6

Revenue and Contract Balances_2

Revenue and Contract Balances - Performance Obligation (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Revenue from Contract with Customer [Abstract]
Remaining performance obligation	$ 120.8	$ 75.7
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance obligation satisfaction period	12 months
Minimum | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Percentage of remaining obligation expected to be satisfied (percent)	50.00%
Maximum | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Percentage of remaining obligation expected to be satisfied (percent)	60.00%

Revenue and Contract Balances_3

Revenue and Contract Balances - Information About Receivables, Contract Assets and Contract Liabilities from Contracts with Customers (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2020
Revenue from Contract with Customer [Abstract]
Accounts receivable	$ 39.5	$ 43.6
Contracts retention	7.3	8.6
Allowances (credit losses and doubtful accounts)	(3.3)	(0.6)	$ (0.3)
Accounts receivable and retention, net	43.5	51.6
Costs and estimated earnings in excess of billings on uncompleted contracts	2.3	10
Billings in excess of costs and estimated earnings on uncompleted contracts	8.5	7.9
Variable consideration	62	62
Other deferred revenue	4.9	5.6
Revenue recognized related to contract liabilities	$ 7.4	$ 4.7

Revenue and Contract Balances_4

Revenue and Contract Balances - Uncompleted Contracts (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Revenue from Contract with Customer [Abstract]
Costs incurred on uncompleted contracts	$ 389.8	$ 339.3
Estimated earnings	41.1	38.3
Subtotal	430.9	377.6
Billings to date	(437.1)	(375.5)
Total	$ (6.2)	$ 2.1

Leases - The Company as Lessor

Leases - The Company as Lessor - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2018
Leases [Abstract]
Reductions to revenue for receivables and unbilled straight-line assets whose payment receipt is deemed not probable	$ 15.4
Reduction of revenue for allowance for doubtful accounts on operating lease receivables	$ 3.6
Contingent rentals		$ 4.7

Leases - The Company as Lesso_2

Leases - The Company as Lessor - Schedule of Historical Cost and Accumulated Depreciation of Leased Property (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Lessor, Lease, Description [Line Items]
Leased property - real estate	$ 1,549.7	$ 1,540.2
Less: Accumulated depreciation	(154.4)	(127.5)
Real estate property, net	1,395.3	1,412.7
Leased property
Lessor, Lease, Description [Line Items]
Leased property - real estate	1,525.3	1,511.3
Less: Accumulated depreciation	(152.2)	(125)
Real estate property, net	$ 1,373.1	$ 1,386.3

Leases - The Company as Lesso_3

Leases - The Company as Lessor - Schedule of Rental Income Under Non-cancelable Operating Leases (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Lease payments	$ 113.7	$ 111.2
Variable lease payments	39.3	51.8
Total rental income	$ 153	$ 163

Leases - The Company as Lesso_4

Leases - The Company as Lessor - Schedule of Future Minimum Rentals on Non-cancelable Operating Leases (Details) $ in Millions	Dec. 31, 2020USD ($)
Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract]
2021	$ 119.3
2022	109.2
2023	98.4
2024	85.4
2025	73.2
Thereafter	502.3
Total future lease payments to be received	$ 987.8

Leases - The Company as Lesse_2

Leases - The Company as Lessee - Schedule of Lease Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease cost	$ 4.6	$ 5.1
Amortization of right-of-use assets	1.2	0.6
Interest on lease liabilities	0.1	0.1
Total lease cost - operating and finance leases	5.9	5.8
Short-term lease cost	0.6	0.7
Variable lease cost	0.6	0.5
Sublease income	$ 0.3	$ 0.3

Leases - The Company as Lesse_3

Leases - The Company as Lessee - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018USD ($)
Leases [Abstract]
Lease expense	$ 6.1

Leases - The Company as Lesse_4

Leases - The Company as Lessee - Other amounts Relating to Finance and Operating Leases (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating cash outflows from operating leases	$ 4.6	$ 5.3
Operating cash outflows from financing leases	0.1	0.1
Financing cash flows from finance leases	$ 1.2	$ 0.6
Weighted-average remaining lease term (years) - operating leases	9 years 1 month 6 days	9 years 3 months 18 days
Weighted-average remaining lease term (years) - finance leases	2 years 10 months 24 days	3 years 3 months 18 days
Weighted-average discount rate - operating leases (percent)	4.40%	4.40%
Weighted-average discount rate - finance leases (percent)	3.20%	3.10%

Leases - The Company as Lesse_5

Leases - The Company as Lessee - Future Minimum Payments Under Non-cancelable Operating Leases as Lessee (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Operating Leases
2021	$ 4.6
2022	4.6
2023	3.4
2024	2.7
2025	1.2
Thereafter	7.9
Total lease payments	24.4
Less: Interest	(6)
Total lease liabilities	18.4	$ 21.6
Finance Leases
2021	1.4
2022	1
2023	0.7
2024	0.2
2025	0
Thereafter	0
Total lease payments	3.3
Less: Interest	(0.1)
Total lease liabilities	$ 3.2	$ 3.5

Leases - The Company as Lesse_6

Leases - The Company as Lessee - ROU Assets and Lease liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
ROU assets	$ 4.2	$ 3.8
Lease liabilities	$ 3.2	$ 3.5

Share-Based Payment Awards - Na

Share-Based Payment Awards - Narrative (Details)	12 Months Ended
	Dec. 31, 2020USD ($)program_under_incentive_compensation_plan$ / sharesshares	Dec. 31, 2019USD ($)$ / sharesshares	Dec. 31, 2018USD ($)$ / sharesshares	Jan. 01, 2018shares	Dec. 31, 2017shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (shares) | shares	0	0	0
Total recognized tax benefit	$ 0	$ 0	$ 0
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Maximum contractual term	10 years
Time-based restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation not yet recognized	$ 5,700,000
Expected recognition period	3 years
Time-based restricted stock units | Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Time-based restricted stock units | Non-employee Director | Granted prior to 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Time-based restricted stock units | Non-employee Director | 2019 Grants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year
Performance share units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
2012 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant (shares) | shares	1,400,000			5,300,000	4,300,000
Number of separate incentive compensation programs | program_under_incentive_compensation_plan	4
Number of programs that generally award share-based compensation | program_under_incentive_compensation_plan	3
2012 Plan | Time-based restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value (in dollars per share) | $ / shares	$ 22.01
2012 Plan | Restricted stock units and market-based performance share units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value (in dollars per share) | $ / shares	$ 22.01	$ 20.05	$ 28.76
Total recognized tax benefit	$ 0	$ 0

Share-Based Payment Awards - Sc

Share-Based Payment Awards - Schedule of Stock Option Activity (Details) - Stock Options - 2012 Plan	12 Months Ended
	Dec. 31, 2020USD ($)$ / sharesshares
2012 Plan Stock Options
Outstanding, beginning balance (in shares) | shares	352,200
Exercised (in shares) | shares	(254,300)
Cancelled (in shares) | shares	0
Outstanding, ending balance (in shares) | shares	97,900
Vested or expected to vest (in shares) | shares	97,900
Exercisable (in shares) | shares	97,900
Weighted- Average Exercise Price
Outstanding, beginning balance (in dollars per share) | $ / shares	$ 13.95
Exercised (in dollars per share) | $ / shares	13.62
Cancelled (in dollars per share) | $ / shares	0
Outstanding, ending balance (in dollars per share) | $ / shares	14.80
Vested or expected to vest (in dollars per share) | $ / shares	14.80
Exercisable (in dollars per share) | $ / shares	$ 14.80
Weighted- Average Contractual Life
Weighted Average Contractual Life, Outstanding	1 year
Weighted Average Contractual Life, Vested or expected to vest (in years)	1 year
Weighted Average Contractual Life, Exercisable	1 year
Aggregate Intrinsic Value
Aggregate Intrinsic Value, Outstanding | $	$ 221,700
Aggregate Intrinsic Value, Vested or expected to vest | $	221,700
Aggregate Intrinsic Value, Exercisable | $	$ 221,700

Share-Based Payment Awards - Su

Share-Based Payment Awards - Summary of Non-vested Restricted Stock Unit Activity (Details) - Time-based restricted stock units - 2012 Plan	12 Months Ended
	Dec. 31, 2020$ / sharesshares
2012 Plan Restricted Stock Units
Outstanding, beginning balance (in shares) | shares	454,700
Granted (in shares) | shares	286,200
Vested (in shares) | shares	(135,300)
Canceled (in shares) | shares	(55,100)
Outstanding, ending balance (in shares) | shares	550,500
Weighted- Average Grant-date Fair Value
Outstanding, beginning balance (in dollars per share) | $ / shares	$ 27.33
Granted (in dollars per share) | $ / shares	22.01
Vested (in dollars per share) | $ / shares	25.14
Canceled (in dollars per share) | $ / shares	23.93
Outstanding, ending balance (in dollars per share) | $ / shares	$ 25.44

Share-Based Payment Awards - _2

Share-Based Payment Awards - Schedule of Fair Value Assumptions of Market-based Awards (Details) - Time-based restricted stock units - 2012 Plan - Time-Based Vesting	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility of A&B common stock (percent)	22.60%	23.60%	22.70%
Average volatility of peer companies (percent)	22.50%	24.20%	21.60%
Risk-free interest rate (percent)	1.30%	2.50%	2.30%

Share-Based Payment Awards - _3

Share-Based Payment Awards - Summary of Compensation Cost related to Share-based Payments (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based expense	$ 5,800,000	$ 5,400,000	$ 4,700,000
Total recognized tax benefit	0	0	0
Share-based expense (net of tax)	5,800,000	5,400,000	4,700,000
Cash received upon option exercise	3,500,000	2,600,000	400,000
Intrinsic value of options exercised	500,000	2,600,000	400,000
Tax benefit realized upon option exercise	0	0	0
Fair value of stock vested	3,000,000	4,500,000	4,000,000
Time-based and market-based restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based expense	$ 5,800,000	$ 5,400,000	$ 4,700,000

Employee Benefit Plans - Schedu

Employee Benefit Plans - Schedule of the Status of Funded Defined Benefit Pension Plan and Unfunded Accumulated Post-retirement Benefit Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Pension Benefits
Change in Benefit Obligation
Benefit obligation at beginning of year	$ 204.4	$ 189.6
Service cost	0.8	2.3	$ 1.8
Interest cost	6.5	8	7.4
Plan participants’ contributions	0	0
Actuarial (gain) loss	21.1	19
Benefits paid	(14.1)	(14.5)
Settlement	0	0
Benefit obligation at end of year	218.7	204.4	189.6
Change in Plan Assets
Fair value of plan assets at beginning of year	190.5	173.6
Actual return on plan assets	24.2	31.4
Employer contributions	0	0	0
Participant contributions	0	0
Benefits paid	(14.1)	(14.5)
Settlement	0	0
Fair value of plan assets at end of year	200.6	190.5	173.6
Funded Status (Recognized Liability)	(18.1)	(13.9)
Other Post-retirement Benefits
Change in Benefit Obligation
Benefit obligation at beginning of year	10.1	10.6
Service cost	0.1	0.1	0.1
Interest cost	0.3	0.4	0.4
Plan participants’ contributions	0.8	0.8
Actuarial (gain) loss	3.7	(0.3)
Benefits paid	(1.5)	(1.5)
Settlement	0	0
Benefit obligation at end of year	13.5	10.1	10.6
Change in Plan Assets
Fair value of plan assets at beginning of year	0	0
Actual return on plan assets	0	0
Employer contributions	0.7	0.8
Participant contributions	0.8	0.7
Benefits paid	(1.5)	(1.5)
Settlement	0	0
Fair value of plan assets at end of year	0	0	0
Funded Status (Recognized Liability)	(13.5)	(10.1)
Other Post-retirement Benefits | Non-qualified Plan Benefits
Change in Benefit Obligation
Benefit obligation at beginning of year	2.8	2.7
Service cost	0	0.1	0.1
Interest cost	0.1	0.1	0.1
Plan participants’ contributions	0	0
Actuarial (gain) loss	0.2	0.2
Benefits paid	0	(0.3)
Settlement	0	0
Benefit obligation at end of year	3.1	2.8	2.7
Change in Plan Assets
Fair value of plan assets at beginning of year	0	0
Actual return on plan assets	0	0
Employer contributions	0	0.3
Participant contributions	0	0
Benefits paid	0	(0.3)
Settlement	0	0
Fair value of plan assets at end of year	0	0	$ 0
Funded Status (Recognized Liability)	$ (3.1)	$ (2.8)

Employee Benefit Plans - Sche_2

Employee Benefit Plans - Schedule of Weighted-Average and Target Asset Allocations (Details) - Pension Benefits	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Target allocations (percent)	100.00%
Weighted-average asset allocations (percent)	100.00%	100.00%
Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Target allocations (percent)	100.00%
Weighted-average asset allocations (percent)	99.00%	99.00%
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Target allocations (percent)	0.00%
Weighted-average asset allocations (percent)	1.00%	1.00%

Employee Benefit Plans - Sche_3

Employee Benefit Plans - Schedule of Fair Value of Pension Plan Assets by Asset Category (Details) - Pension plans - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 200.6	$ 190.5	$ 173.6
Fair Value, Levels | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Plan assets	1.2	1.2
Fair Value, Levels | U.S. Treasury obligations
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
Fair Value, Levels | Domestic corporate bonds and notes
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
Fair Value, Levels | Foreign corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
Quoted Prices in Active Markets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	1.2	1.2
Quoted Prices in Active Markets (Level 1) | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Plan assets	1.2	1.2
Quoted Prices in Active Markets (Level 1) | U.S. Treasury obligations
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
Quoted Prices in Active Markets (Level 1) | Domestic corporate bonds and notes
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
Quoted Prices in Active Markets (Level 1) | Foreign corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
Significant Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
Significant Observable Inputs (Level 2) | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
Significant Observable Inputs (Level 2) | U.S. Treasury obligations
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
Significant Observable Inputs (Level 2) | Domestic corporate bonds and notes
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
Significant Observable Inputs (Level 2) | Foreign corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0	0
Assets measured at NAV
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 199.4	$ 189.3

Employee Benefit Plans - Narrat

Employee Benefit Plans - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Actual return on plan assets (percent)	12.70%	18.10%
Defined Contribution 401k Plan
Defined Benefit Plan Disclosure [Line Items]
Employer matching contribution (percent)	3.00%
Company's matching contribution expense	$ 0.6	$ 0.2	$ 0.6
Cash Balance Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Employer matching contribution (percent)	3.00%
Company's matching contribution expense	$ 0.7	0	0
Grace 401(k) Plans
Defined Benefit Plan Disclosure [Line Items]
Company's matching contribution expense	$ 1.1	1.1	1.8
Company's maximum annual contributions per employee (percent)	10.00%
Deferred Profit Sharing
Defined Benefit Plan Disclosure [Line Items]
Company's matching contribution expense	$ 0.5	$ 0.3	$ 0.4
Deferred Profit Sharing | Minimum
Defined Benefit Plan Disclosure [Line Items]
Employer matching contribution (percent)	1.00%
Deferred Profit Sharing | Maximum
Defined Benefit Plan Disclosure [Line Items]
Employer matching contribution (percent)	5.00%
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Expected return on plan assets	3.70%	4.30%	4.30%
Accumulated benefit obligation	$ 218.7	$ 204.4
Employer contributions	$ 0	$ 0	$ 0

Employee Benefit Plans - Sche_4

Employee Benefit Plans - Schedule of Estimated Future Benefit Payments for the Next Ten Years (Details) $ in Millions	Dec. 31, 2020USD ($)
Defined Benefit Plan Disclosure [Line Items]
2021	$ 14
2022	15.1
2023	13.6
2024	13.9
2025	15.3
2026-2030	62.8
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
2021	13.2
2022	13.1
2023	12.9
2024	13.2
2025	12.7
2026-2030	59.5
Other Post-retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
2021	0.8
2022	0.8
2023	0.7
2024	0.7
2025	0.7
2026-2030	3.3
Other Post-retirement Benefits | Non-qualified Plan Benefits
Defined Benefit Plan Disclosure [Line Items]
2021	0
2022	1.2
2023	0
2024	0
2025	1.9
2026-2030	$ 0

Employee Benefit Plans - Summar

Employee Benefit Plans - Summary of Components of Net Periodic Benefit Cost and Other Amounts Recognized in Other Comprehensive Loss (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Pension Benefits
Components of Net Periodic Benefit Cost
Service cost	$ (0.8)	$ (2.3)	$ (1.8)
Interest cost	(6.5)	(8)	(7.4)
Expected return on plan assets	6.8	7.3	8.2
Amortization of net loss	(2.5)	(4.1)	(4.2)
Amortization of prior service cost	0	0.6	0.5
Curtailment gain (loss)	0	1.3	0
Settlement gain (loss)	0	0	0
Net periodic benefit cost	(3)	(5.2)	(4.7)
Net gain (loss)	(3.8)	5.2	(6.5)
Amortization of net loss	2.5	4.1	4.2
Prior service cost	(0.1)	0	0
Amortization of prior service credit	0	(0.6)	(0.5)
Curtailment gain recognition of prior service credit	0	(1.3)	0
Recognition of settlement loss	0	0	0
Total recognized in Other comprehensive income (loss)	(1.4)	7.4	(2.8)
Total recognized in net periodic benefit cost and Other comprehensive income (loss)	(4.4)	2.2	(7.5)
Other Post-retirement Benefits
Components of Net Periodic Benefit Cost
Service cost	(0.1)	(0.1)	(0.1)
Interest cost	(0.3)	(0.4)	(0.4)
Expected return on plan assets	0	0	0
Amortization of net loss	0.1	0.1	(0.3)
Amortization of prior service cost	0	0	0
Curtailment gain (loss)	0	0	0
Settlement gain (loss)	0	0	0
Net periodic benefit cost	(0.3)	(0.4)	(0.8)
Net gain (loss)	(3.7)	0.3	1.4
Amortization of net loss	(0.1)	(0.1)	0.3
Prior service cost	0	0	0
Amortization of prior service credit	0	0	0
Curtailment gain recognition of prior service credit	0	0	0
Recognition of settlement loss	0	0	0
Total recognized in Other comprehensive income (loss)	(3.8)	0.2	1.7
Total recognized in net periodic benefit cost and Other comprehensive income (loss)	(4.1)	(0.2)	0.9
Other Post-retirement Benefits | Non-qualified Plan Benefits
Components of Net Periodic Benefit Cost
Service cost	0	(0.1)	(0.1)
Interest cost	(0.1)	(0.1)	(0.1)
Expected return on plan assets	0	0	0
Amortization of net loss	(0.1)	0	(0.1)
Amortization of prior service cost	0	0.1	0.2
Curtailment gain (loss)	0	0.1	0.6
Settlement gain (loss)	0	0	(0.1)
Net periodic benefit cost	(0.2)	0	0.4
Net gain (loss)	(0.2)	(0.2)	0.2
Amortization of net loss	0.1	0	0.1
Prior service cost	0	0	0
Amortization of prior service credit	0	(0.1)	(0.2)
Curtailment gain recognition of prior service credit	0	(0.1)	(0.6)
Recognition of settlement loss	0	0	0.1
Total recognized in Other comprehensive income (loss)	(0.1)	(0.4)	(0.4)
Total recognized in net periodic benefit cost and Other comprehensive income (loss)	$ (0.3)	$ (0.4)	$ 0

Employee Benefit Plans - Summ_2

Employee Benefit Plans - Summary of Amounts Recognized on the Consolidated Balance Sheets and in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Pension Benefits
Amounts recognized in accumulated other comprehensive loss [Abstract]
Net gain (loss), net of taxes	$ (48.8)	$ (47.4)
Unrecognized prior service credit (cost), net of taxes	(0.1)	0
Total	(48.9)	(47.4)
Other Post-retirement Benefits
Amounts recognized in accumulated other comprehensive loss [Abstract]
Net gain (loss), net of taxes	(3.6)	0.2
Unrecognized prior service credit (cost), net of taxes	0	0
Total	(3.6)	0.2
Other Post-retirement Benefits | Non-qualified Plan Benefits
Amounts recognized in accumulated other comprehensive loss [Abstract]
Net gain (loss), net of taxes	(0.8)	(0.8)
Unrecognized prior service credit (cost), net of taxes	0	0
Total	$ (0.8)	$ (0.8)

Employee Benefit Plans - Summ_3

Employee Benefit Plans - Summary of Weighted Average Assumptions used to Determine Benefit Information (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Pension Benefits
Weighted average assumptions used to determine net periodic benefit cost [Abstract]
Discount rate	2.40%	3.29%	4.33%
Expected return on plan assets	3.70%	4.30%	4.30%
Interest crediting rates	0.71%	1.68%	3.01%
Pension Benefits | Minimum
Weighted average assumptions used to determine net periodic benefit cost [Abstract]
Rate of compensation increase		0.50%	0.50%
Pension Benefits | Maximum
Weighted average assumptions used to determine net periodic benefit cost [Abstract]
Rate of compensation increase		3.00%	3.00%
Other Post-retirement Benefits
Weighted average assumptions used to determine net periodic benefit cost [Abstract]
Discount rate	2.49%	3.38%	4.38%
Assumed health care cost trend rates [Abstract]
Initial health care cost trend rate	5.70%	6.00%	6.20%
Ultimate rate	4.50%	4.50%	4.50%
Other Post-retirement Benefits | Minimum
Weighted average assumptions used to determine net periodic benefit cost [Abstract]
Rate of compensation increase	0.50%	0.50%	0.50%
Other Post-retirement Benefits | Maximum
Weighted average assumptions used to determine net periodic benefit cost [Abstract]
Rate of compensation increase	3.00%	3.00%	3.00%
Other Post-retirement Benefits | Non-qualified Plan Benefits
Weighted average assumptions used to determine net periodic benefit cost [Abstract]
Discount rate	1.07%	2.48%	3.78%
Interest crediting rates	0.71%	1.68%	3.01%

Employee Benefit Plans - Sche_5

Employee Benefit Plans - Schedule of Multiemployer Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Multiemployer Plans [Line Items]
Plan Number	001
Contribution by Entity	$ 4	$ 5.6	$ 6
Operating Engineers
Multiemployer Plans [Line Items]
EIN	946090764
Multiemployer Plan, Pension, Significant, Certified Zone Status [Fixed List]	Yellow
Multiemployer Plan, Pension, Significant, Funding Improvement or Rehabilitation Plan, Implementation Status [Fixed List]	Implemented
Contribution by Entity	$ 3.3	4.1	4.7
Multiemployer Plan, Pension, Significant, Surcharge [Fixed List]	No
Multiemployer Plan, Pension, Significant, Collective-Bargaining Arrangement, Expiration Date	Aug. 31, 2024
Laborers National
Multiemployer Plans [Line Items]
EIN	526074345
Multiemployer Plan, Pension, Significant, Certified Zone Status [Fixed List]	Yellow
Multiemployer Plan, Pension, Significant, Funding Improvement or Rehabilitation Plan, Implementation Status [Fixed List]	Implemented
Contribution by Entity	$ 0.2	0.2	0.2
Multiemployer Plan, Pension, Significant, Surcharge [Fixed List]	No
Multiemployer Plan, Pension, Significant, Collective-Bargaining Arrangement, Expiration Date	Aug. 31, 2021
Hawai‘i Laborers (GPRM)
Multiemployer Plans [Line Items]
EIN	996025107
Multiemployer Plan, Pension, Significant, Certified Zone Status [Fixed List]	Green
Multiemployer Plan, Pension, Significant, Funding Improvement or Rehabilitation Plan, Implementation Status [Fixed List]	No
Contribution by Entity	$ 0.3	1.1	0.9
Multiemployer Plan, Pension, Significant, Surcharge [Fixed List]	No
Hawai‘i Laborers (GPRS)
Multiemployer Plans [Line Items]
EIN	996025107
Multiemployer Plan, Pension, Significant, Certified Zone Status [Fixed List]	Green
Multiemployer Plan, Pension, Significant, Funding Improvement or Rehabilitation Plan, Implementation Status [Fixed List]	No
Contribution by Entity	$ 0.2	$ 0.2	$ 0.2
Multiemployer Plan, Pension, Significant, Surcharge [Fixed List]	No
Multiemployer Plan, Pension, Significant, Collective-Bargaining Arrangement, Expiration Date	Sep. 30, 2024

Income Taxes - Schedule of Inco

Income Taxes - Schedule of Income Tax Expense (Benefit) on Income from Continuing Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current:
Federal	$ (0.1)	$ (1.6)	$ (0.3)
State	(0.3)	(0.4)	0
Current	(0.4)	(2)	(0.3)
Deferred:
Federal	0	0	14
State	0	0	2.6
Deferred	0	0	16.6
Income tax expense (benefit)	$ (0.4)	$ (2)	$ 16.3

Income Taxes - Schedule of In_2

Income Taxes - Schedule of Income Tax Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Computed federal income tax expense	$ 1.2	$ (8.2)	$ (11.1)
State income taxes	(1.1)	(5.1)	(15.6)
Valuation allowance	3.4	8.3	84.4
REIT rate differential	(4.7)	(7.9)	(51.5)
Amended return	0	(1.1)	0.6
Noncontrolling interest	0.1	0.5	(0.6)
Impairment	0	12.4	10.7
Other, net	0.7	(0.9)	(0.6)
Income tax expense (benefit)	$ (0.4)	$ (2)	$ 16.3

Income Taxes - Schedule of Tax

Income Taxes - Schedule of Tax effects of Temporary Differences Affecting Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets:
Employee benefits	$ 11.5	$ 10.4
Capitalized costs	5.5	6.2
Joint ventures and other investments	42.6	49.1
Impairment and amortization	1.6	0.9
Solar investment benefits	15.7	16.7
Insurance and other reserves	6.4	3.2
Disallowed interest expense	9.1	8.4
Net operating losses	20.5	17.6
Operating lease liability	2	2.6
Other	3.2	3.4
Total deferred tax assets	118.1	118.5
Valuation allowance	(104)	(99.3)
Total net deferred tax assets	14.1	19.2
Deferred tax liabilities:
Property (including tax-deferred gains on real estate transactions)	12.2	16
Operating lease asset	1.9	2.5
Other	0	0.7
Total deferred tax liabilities	14.1	19.2
Net deferred tax assets (liabilities)	$ 0	$ 0

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating Loss Carryforwards [Line Items]
Federal net operating loss carryforward	$ 74,900,000
Federal net operating loss carryforward, tax-effected	15,700,000
Increase in valuation allowance	4,700,000
Total recognized tax benefit	0	$ 0	$ 0
Accrued interest or penalties on unrecognized tax positions	0
Federal
Operating Loss Carryforwards [Line Items]
Tax credit carryforward	8,700,000
Operating loss carryforwards subject to expiration	11,500,000
Operating loss carryforwards subject to expiration, tax-effected	2,400,000
State
Operating Loss Carryforwards [Line Items]
Tax credit carryforward	6,900,000
State net operating loss carryforwards	94,300,000
State net operating loss carryforwards, tax-effected	4,800,000
State | California
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards subject to expiration	21,600,000
Operating loss carryforwards subject to expiration, tax-effected	$ 1,100,000

Income Taxes - Summary of Valua

Income Taxes - Summary of Valuation Allowance Activity (Details) - Deferred Tax Asset Valuation Allowance - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ 99.3	$ 91.5	$ 6.9
Net Change	4.7	7.8	84.6
Balance at End of Year	$ 104	$ 99.3	$ 91.5

Earnings Per Share (_EPS_) - Sc

Earnings Per Share (“EPS”) - Schedule of Reconciliation of Income from Continuing Operations and Computation of Earnings per Share (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Income (loss) from continuing operations	$ 6	$ (36.9)	$ (69.2)
Exclude: (Income) loss attributable to noncontrolling interest	0.4	2	(2.2)
Income (loss) from continuing operations attributable to A&B shareholders	6.4	(34.9)	(71.4)
Exclude: (Increase) decrease in carrying value of redeemable non-controlling interest	0	0	0
Income (loss) from continuing operations available to A&B shareholders	6.4	(34.9)	(71.4)
Distributions and allocations to participating securities	(0.1)	(0.2)	0
Income (loss) from continuing operations available to A&B common shareholders	6.3	(35.1)	(71.4)
Income (loss) from discontinued operations available to A&B common shareholders	(0.8)	(1.5)	(0.6)
Net income (loss) available to A&B common shareholders	$ 5.5	$ (36.6)	$ (72)
Effect of dilutive securities:
Denominator for basic EPS – weighted-average shares outstanding (in shares)	72.3	72.2	70.6
Non-participating stock options and restricted stock unit awards (in shares)	0.1	0	0
Special Distribution (in shares)	0	0	0
Denominator for diluted EPS – weighted average shares outstanding (in shares)	72.4	72.2	70.6

Earnings Per Share (_EPS_) - Na

Earnings Per Share (“EPS”) - Narrative (Details) - shares shares in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Anti-dilutive securities excluded from the computation of weighted average dilutive shares outstanding (in shares)	0.3	0.2	0

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss)	$ (60)	$ (48.8)
Beginning balance	1,128.7	1,208.3	$ 651.1
Other comprehensive income (loss) before reclassifications, net of taxes	(14.6)	1.3	(3.9)
Amounts reclassified from accumulated other comprehensive loss, net of taxes	3.4	1.8	3.4
Ending balance	1,096.1	1,128.7	1,208.3
Other comprehensive income (loss) before reclassifications, tax	0	0	0
Reclassification from AOCI, Current Period, Tax	0	0	0
Impact of adoption of new accounting standards
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(4.1)		(1.4)
Ending balance		(4.1)
Accumulated Other Compre- hensive Income (Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(48.8)	(51.9)	(42.3)
Impact of adoption of ASU 2018-02			(9.1)
Ending balance	(60)	(48.8)	(51.9)
Accumulated Other Compre- hensive Income (Loss) | Impact of adoption of new accounting standards
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	0		(9.1)
Ending balance		0
Employee Benefit Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(48)	(55.2)	(44.2)
Other comprehensive income (loss) before reclassifications, net of taxes	(7.7)	5.3	(4.9)
Amounts reclassified from accumulated other comprehensive loss, net of taxes	2.4	1.9	3.4
Impact of adoption of ASU 2018-02			(9.5)
Ending balance	(53.3)	(48)	(55.2)
Employee Benefit Plans | Pension Benefits
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss)	(53.3)	(48)
Employee Benefit Plans | Qualified Plans | Pension Benefits
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss)	(48.9)	(47.4)
Employee Benefit Plans | Qualified Plans | Post-retirement plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss)	(3.6)	0.2
Employee Benefit Plans | Non-qualified Plan | Pension Benefits
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss)	(0.8)	(0.8)
Interest Rate Swap
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss)	(6.7)	(0.8)
Beginning balance	(0.8)	3.3	1.9
Other comprehensive income (loss) before reclassifications, net of taxes	(6.9)	(4)	1
Amounts reclassified from accumulated other comprehensive loss, net of taxes	1	(0.1)	0
Impact of adoption of ASU 2018-02			0.4
Ending balance	$ (6.7)	$ (0.8)	$ 3.3

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Income (Loss) - Reclassification of Other Comprehensive Income (Loss) Components (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Equity [Abstract]
Amount of gain (loss) recognized in OCI on derivatives	$ (6.9)	$ (4)	$ 1
Actuarial loss	(7.7)	5.3	(4.9)
Impact of reclassification adjustment to interest expense included in Net Income (Loss)	1	(0.1)	0
Amortization of net loss included in net periodic benefit cost	2.5	4	4.6
Prior service cost	(0.1)	0	0
Amortization of defined benefit pensions items reclassified to net periodic pension cost: Prior service credit	0	(0.7)	(0.7)
Curtailment (gain)/loss	0	(1.4)	(0.6)
Settlement (gain)/loss	0	0	0.1
Total before income tax	(11.2)	3.1	(0.5)
Income taxes	0	0	0
Other comprehensive income (loss), net of tax	$ (11.2)	$ 3.1	$ (0.5)

Related Party Transactions (Det

Related Party Transactions (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)commercial_unit	Dec. 31, 2018USD ($)
The Collection High-rise Residential Condominium | Hawaii
Related Party Transaction [Line Items]
Number of units acquired | commercial_unit		5
Payments to acquire real estate		$ 6.9
Affiliated Entity | Materials & Construction | Supplier Contracts
Related Party Transaction [Line Items]
Revenue from related parties	$ 7.4	10.5	$ 16.6
Receivables from related parties	0.9	0.2
Payables to related parties	0.3	1.2
Affiliated Entity | Real estate leasing and development | Lease Agreements
Related Party Transaction [Line Items]
Revenue from related parties		1.3	4.3
Expenses related to affiliates	1.1	0.1	0.1
Affiliated Entity | Land Operations | Land Operations
Related Party Transaction [Line Items]
Revenue from related parties	3.1	2.2	$ 1.1
Affiliated Entity | Land Operations | Service Revenues and Interest
Related Party Transaction [Line Items]
Receivables from related parties	0.1	0.1
Affiliated Entity | Land Operations | Extension of Secured Note Receivable
Related Party Transaction [Line Items]
Receivable from affiliate	$ 9.5	$ 13.1

Segment Results - Narrative (De

Segment Results - Narrative (Details) ft² in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2020ft²asegment	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Revenue, Major Customer [Line Items]
Number of operating segments	3
Number of reportable segments	3
Maui | Mahi Pono Holdings, LLC | Not Discontinued Operations
Revenue, Major Customer [Line Items]
Gross profit | $		$ 6.7	$ 162.2
Land | Real estate leasing and development
Revenue, Major Customer [Line Items]
Rentable area | ft²	3.9
Land | Hawaii | Real estate leasing and development
Revenue, Major Customer [Line Items]
Area of real estate property | a	153.8

Segment Results - Schedule of O

Segment Results - Schedule of Operating Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information, Profit (Loss) [Abstract]
Total operating revenue			$ 305.3	$ 435.2	$ 644.4
Total operating profit (loss)			54.7	17.8	(41.4)
Total gain (loss) on disposal of assets, net			0.5	0	51.4
Interest expense			(30.3)	(33.1)	(35.3)
General corporate expenses			(19.3)	(23.6)	(27.6)
Income (Loss) from Continuing Operations Before Income Taxes			5.6	(38.9)	(52.9)
Identifiable assets		$ 2,225.2	2,036	2,084.3	2,225.2
Capital expenditures			25.1	255.1	296.1
Depreciation and Amortization			53.3	50.5	42.8
Impairment of assets			5.6	49.7	268
Goodwill impairment	$ 49.7	37.2		49.7
Commercial Real Estate
Segment Reporting Information, Profit (Loss) [Abstract]
Commercial Real Estate			150	160.6	140.3
Total operating profit (loss)			49.8	66.2	58.5
Goodwill impairment				0
Land Operations
Segment Reporting Information, Profit (Loss) [Abstract]
Revenues			40.6	114.1	289.5
Total operating profit (loss)			17.3	20.8	(26.7)
Impairment of assets					186.8
Materials & Construction
Segment Reporting Information, Profit (Loss) [Abstract]
Revenues			114.7	160.5	214.6
Total operating profit (loss)			(12.4)	(69.2)	(73.2)
Goodwill impairment			5.6	49.7
Operating Segments | Commercial Real Estate
Segment Reporting Information, Profit (Loss) [Abstract]
Identifiable assets		1,530.4	1,499.9	1,532.6	1,530.4
Capital expenditures			18.8	250.5	282.7
Depreciation and Amortization			40.1	36.7	28
Operating Segments | Land Operations
Segment Reporting Information, Profit (Loss) [Abstract]
Identifiable assets		350	258.4	282.5	350
Capital expenditures			1.4	2.3	1.4
Depreciation and Amortization			1.5	1.6	1.9
Operating Segments | Materials & Construction
Segment Reporting Information, Profit (Loss) [Abstract]
Identifiable assets		297.1	211.9	243	297.1
Capital expenditures			4.5	1.9	11
Depreciation and Amortization			10.8	11.4	12.1
Other
Segment Reporting Information, Profit (Loss) [Abstract]
Identifiable assets		$ 47.7	65.8	26.2	47.7
Capital expenditures			0.4	0.4	1
Depreciation and Amortization			$ 0.9	$ 0.8	$ 0.8

Agricultural Land Sale (Details

Agricultural Land Sale (Details) $ in Millions	Dec. 17, 2018USD ($)a	Feb. 28, 2019USD ($)a	Jan. 31, 2019	Dec. 31, 2019USD ($)a	Dec. 31, 2018USD ($)a	Dec. 31, 2020USD ($)
Real Estate [Line Items]
Contingency reserves				$ 62		$ 62
Deferred revenue				$ 67.6		66.9
EMI
Real Estate [Line Items]
Ownership interest held (percent)			50.00%
Maui | EMI
Real Estate [Line Items]
Area of land sold (acres) | a					41,000
Not Discontinued Operations | Maui | Maui Diversified Agriculture
Real Estate [Line Items]
Ownership interest held (percent)	100.00%
Not Discontinued Operations | Maui | EMI
Real Estate [Line Items]
Ownership interest held (percent)		50.00%
Not Discontinued Operations | Mahi Pono Holdings, LLC | Maui
Real Estate [Line Items]
Area of land sold (acres) | a	41,000	800		41,000
Proceeds from sale	$ 261.6	$ 2.7
Contingency reserves	$ 19.5
Gross profit				$ 6.7	$ 162.2
Not Discontinued Operations | Mahi Pono Holdings, LLC | Maui | State Water Leases
Real Estate [Line Items]
Deferred revenue				$ 62		$ 62

Long-lived Assets - Impairmen_3

Long-lived Assets - Impairments, Held for Sale or Disposals - Schedule of Intangible Assets and Fixed Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Finite-lived Intangible Assets [Roll Forward]
Balance, January 1, 2018	$ 74.9
Amortization	(14.5)	$ (12.5)	$ (8.7)
Balance, December 31, 2018	61.9	74.9
Movement in Property, Plant and Equipment [Roll Forward]
Additions to fixed assets	25.1	255.1	296.1
Depreciation	(38.8)	(35.6)	(32.5)
Materials and Construction Segment
Finite-lived Intangible Assets [Roll Forward]
Balance, January 1, 2018	8.6	16.5
Additions to intangible assets		0
Amortization		(0.9)
Intangible impairment		(7)
Balance, December 31, 2018		8.6	16.5
Movement in Property, Plant and Equipment [Roll Forward]
Balance, January 1, 2018	$ 105.8	139.5
Additions to fixed assets		11.1
Depreciation		(11.2)
Fixed asset impairment		(33.6)
Balance, December 31, 2018		$ 105.8	$ 139.5

Long-lived Assets - Impairmen_4

Long-lived Assets - Impairments, Held for Sale or Disposals - Narrative (Details) - USD ($) $ in Millions	Jun. 29, 2020	Sep. 30, 2020	Dec. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment of assets				$ 5.6	$ 49.7	$ 268
Impairment of assets related to materials & construction		$ 5.6
Goodwill			$ (65.1)	(10.5)	$ (15.4)	(65.1)
Port Allen Solar Power Facility assets | Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Purchase consideration upon disposal		17.1
Net gain (loss) on disposal		$ 8.9
GPRM Prestress, LLC | Held for sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership interest sold	51.00%				51.00%
GPRM Prestress, LLC | Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Purchase consideration upon disposal	$ 5
Net gain (loss) on disposal	$ (0.1)
Materials and Construction Segment
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Goodwill			(56.4)	(1.8)	$ (6.7)	(56.4)
Commercial property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Goodwill			(8.7)	$ (8.7)	$ (8.7)	$ (8.7)
Paving and Quarry Assets | Materials and Construction Segment
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment of assets			$ 40.6
Paving and Quarry Assets | Materials and Construction Segment | Weighted average discount rate
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Weighted average discount rate (percent)					13.50%

Subsequent Event (Details)

Subsequent Event (Details) - $ / shares	Feb. 23, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Subsequent Event [Line Items]
Dividends declared (in dollars per share)		$ 0.34	$ 0.69	$ 11.65
Subsequent Event
Subsequent Event [Line Items]
Dividends declared (in dollars per share)	$ 0.15

Schedule III - Real Estate an_2

Schedule III - Real Estate and Accumulated Depreciation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Gross Amounts of Which Carried at Close of Period
Total	$ 1,625.4	$ 1,619.3	$ 1,447.7	$ 1,325.1
Accumulated Depreciation	(154.4)	$ (127.5)	$ (107.6)	$ (133.5)
Aggregate tax basis	$ 703.2
Minimum | Building and improvements
Gross Amounts of Which Carried at Close of Period
Estimated useful life or lease term	10 years
Minimum | Leasehold improvements
Gross Amounts of Which Carried at Close of Period
Estimated useful life or lease term	5 years
Minimum | Other property improvements
Gross Amounts of Which Carried at Close of Period
Estimated useful life or lease term	3 years
Maximum | Building and improvements
Gross Amounts of Which Carried at Close of Period
Estimated useful life or lease term	40 years
Maximum | Leasehold improvements
Gross Amounts of Which Carried at Close of Period
Estimated useful life or lease term	10 years
Maximum | Other property improvements
Gross Amounts of Which Carried at Close of Period
Estimated useful life or lease term	35 years
Commercial Real Estate
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	$ 214.9
Initial Cost
Land	723.2
Buildings and Improvements	609.9
Costs Capitalized Subsequent to Acquisition
Improvements	167.1
Carrying Costs	0
Gross Amounts of Which Carried at Close of Period
Land	756.5
Buildings and Improvements	776.8
Total	1,533.3
Accumulated Depreciation	(151.9)
Commercial Real Estate | Kapolei Enterprise Center (HI) | Hawaii | Industrial
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	7.9
Buildings and Improvements	16.8
Costs Capitalized Subsequent to Acquisition
Improvements	0.8
Carrying Costs	0
Gross Amounts of Which Carried at Close of Period
Land	7.9
Buildings and Improvements	17.5
Total	25.4
Accumulated Depreciation	(1)
Commercial Real Estate | Harbor Industrial (HI) | Hawaii | Industrial
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	0
Buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition
Improvements	1.3
Carrying Costs	0
Gross Amounts of Which Carried at Close of Period
Land	0
Buildings and Improvements	1.3
Total	1.3
Accumulated Depreciation	(1.1)
Commercial Real Estate | Honokohau Industrial (HI) | Hawaii | Industrial
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	5
Buildings and Improvements	4.8
Costs Capitalized Subsequent to Acquisition
Improvements	0.1
Carrying Costs	0
Gross Amounts of Which Carried at Close of Period
Land	5
Buildings and Improvements	4.9
Total	9.9
Accumulated Depreciation	(0.5)
Commercial Real Estate | Kailua Industrial/Other (HI) | Hawaii | Industrial
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	10.5
Buildings and Improvements	2
Costs Capitalized Subsequent to Acquisition
Improvements	0.6
Carrying Costs	0
Gross Amounts of Which Carried at Close of Period
Land	10.5
Buildings and Improvements	2.6
Total	13.1
Accumulated Depreciation	(0.5)
Commercial Real Estate | Kakaako Commerce Center (HI) | Hawaii | Industrial
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	16.9
Buildings and Improvements	20.6
Costs Capitalized Subsequent to Acquisition
Improvements	1.9
Carrying Costs	0
Gross Amounts of Which Carried at Close of Period
Land	16.9
Buildings and Improvements	22.5
Total	39.4
Accumulated Depreciation	(3.4)
Commercial Real Estate | Komohana Industrial Park (HI) | Hawaii | Industrial
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	25.2
Buildings and Improvements	10.8
Costs Capitalized Subsequent to Acquisition
Improvements	1.7
Carrying Costs	0
Gross Amounts of Which Carried at Close of Period
Land	25.2
Buildings and Improvements	12.4
Total	37.6
Accumulated Depreciation	(3.3)
Commercial Real Estate | Opule Industrial (HI) | Hawaii | Industrial
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	10.9
Buildings and Improvements	27.1
Costs Capitalized Subsequent to Acquisition
Improvements	0
Carrying Costs	0
Gross Amounts of Which Carried at Close of Period
Land	10.9
Buildings and Improvements	27.1
Total	38
Accumulated Depreciation	(1.4)
Commercial Real Estate | P&L Warehouse (HI) | Hawaii | Industrial
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	0
Buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition
Improvements	1.3
Carrying Costs	0
Gross Amounts of Which Carried at Close of Period
Land	0
Buildings and Improvements	1.3
Total	1.3
Accumulated Depreciation	(0.8)
Commercial Real Estate | Port Allen (HI) | Hawaii | Industrial
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	0
Buildings and Improvements	0.7
Costs Capitalized Subsequent to Acquisition
Improvements	2.4
Carrying Costs	0
Gross Amounts of Which Carried at Close of Period
Land	0
Buildings and Improvements	3.1
Total	3.1
Accumulated Depreciation	(2.3)
Commercial Real Estate | Waipio Industrial (HI) | Hawaii | Industrial
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	19.6
Buildings and Improvements	7.7
Costs Capitalized Subsequent to Acquisition
Improvements	0.7
Carrying Costs	0
Gross Amounts of Which Carried at Close of Period
Land	19.7
Buildings and Improvements	8.4
Total	28.1
Accumulated Depreciation	(2.5)
Commercial Real Estate | Kahului Office Building (HI) | Hawaii | Office
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	1
Buildings and Improvements	0.4
Costs Capitalized Subsequent to Acquisition
Improvements	7.7
Carrying Costs	0
Gross Amounts of Which Carried at Close of Period
Land	1
Buildings and Improvements	8.1
Total	9.1
Accumulated Depreciation	(8.8)
Commercial Real Estate | Kahului Office Center (HI) | Hawaii | Office
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	0
Buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition
Improvements	5.3
Carrying Costs	0
Gross Amounts of Which Carried at Close of Period
Land	0
Buildings and Improvements	5.3
Total	5.3
Accumulated Depreciation	(3.9)
Commercial Real Estate | Lono Center (HI) | Hawaii | Office
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	0
Buildings and Improvements	1.4
Costs Capitalized Subsequent to Acquisition
Improvements	1.3
Carrying Costs	0
Gross Amounts of Which Carried at Close of Period
Land	0
Buildings and Improvements	2.7
Total	2.7
Accumulated Depreciation	(1.7)
Commercial Real Estate | Gateway at Mililani Mauka South (HI) | Hawaii | Office
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	7
Buildings and Improvements	3.5
Costs Capitalized Subsequent to Acquisition
Improvements	6.8
Carrying Costs	0
Gross Amounts of Which Carried at Close of Period
Land	5.5
Buildings and Improvements	10.3
Total	15.8
Accumulated Depreciation	(1.6)
Commercial Real Estate | Aikahi Park Shopping Center (HI) | Hawaii | Retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	23.5
Buildings and Improvements	6.7
Costs Capitalized Subsequent to Acquisition
Improvements	5.9
Carrying Costs	0
Gross Amounts of Which Carried at Close of Period
Land	23.5
Buildings and Improvements	12.6
Total	36.1
Accumulated Depreciation	(2.5)
Commercial Real Estate | Gateway at Mililani Mauka (HI) | Hawaii | Retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	7.3
Buildings and Improvements	4.7
Costs Capitalized Subsequent to Acquisition
Improvements	6.1
Carrying Costs	0
Gross Amounts of Which Carried at Close of Period
Land	7.7
Buildings and Improvements	10.8
Total	18.5
Accumulated Depreciation	(2.1)
Commercial Real Estate | Hokulei Street (HI) | Hawaii | Retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	16.9
Buildings and Improvements	36.5
Costs Capitalized Subsequent to Acquisition
Improvements	2.7
Carrying Costs	0
Gross Amounts of Which Carried at Close of Period
Land	16.9
Buildings and Improvements	39.2
Total	56.1
Accumulated Depreciation	(3.6)
Commercial Real Estate | Kahului Shopping Center (HI) | Hawaii | Retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	0
Buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition
Improvements	2.8
Carrying Costs	0
Gross Amounts of Which Carried at Close of Period
Land	0.6
Buildings and Improvements	2.8
Total	3.4
Accumulated Depreciation	(1.7)
Commercial Real Estate | Kailua Retail Other (HI) | Hawaii | Retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	14.3
Initial Cost
Land	85.1
Buildings and Improvements	73.8
Costs Capitalized Subsequent to Acquisition
Improvements	16.1
Carrying Costs	0
Gross Amounts of Which Carried at Close of Period
Land	86.1
Buildings and Improvements	89.9
Total	176
Accumulated Depreciation	(17.8)
Commercial Real Estate | Kaneohe Bay Shopping Ctr. (HI) | Hawaii | Retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	0
Buildings and Improvements	13.4
Costs Capitalized Subsequent to Acquisition
Improvements	2.4
Carrying Costs	0
Gross Amounts of Which Carried at Close of Period
Land	0.9
Buildings and Improvements	15.8
Total	16.7
Accumulated Depreciation	(7.7)
Commercial Real Estate | Kunia Shopping Center (HI) | Hawaii | Retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	2.7
Buildings and Improvements	10.6
Costs Capitalized Subsequent to Acquisition
Improvements	2
Carrying Costs	0
Gross Amounts of Which Carried at Close of Period
Land	3
Buildings and Improvements	12.6
Total	15.6
Accumulated Depreciation	(5.6)
Commercial Real Estate | Lanihau Marketplace (HI) | Hawaii | Retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	9.4
Buildings and Improvements	13.2
Costs Capitalized Subsequent to Acquisition
Improvements	2.4
Carrying Costs	0
Gross Amounts of Which Carried at Close of Period
Land	9.4
Buildings and Improvements	15.6
Total	25
Accumulated Depreciation	(4.8)
Commercial Real Estate | Laulani Village (HI) | Hawaii | Retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	61.3
Initial Cost
Land	43.4
Buildings and Improvements	64.3
Costs Capitalized Subsequent to Acquisition
Improvements	3
Carrying Costs	0
Gross Amounts of Which Carried at Close of Period
Land	43.4
Buildings and Improvements	67.4
Total	110.8
Accumulated Depreciation	(6)
Commercial Real Estate | Manoa Marketplace (HI) | Hawaii | Retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	57.9
Initial Cost
Land	43.3
Buildings and Improvements	35.9
Costs Capitalized Subsequent to Acquisition
Improvements	3.6
Carrying Costs	0
Gross Amounts of Which Carried at Close of Period
Land	45.1
Buildings and Improvements	39.5
Total	84.6
Accumulated Depreciation	(5.7)
Commercial Real Estate | Napili Plaza (HI) | Hawaii | Retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	9.4
Buildings and Improvements	8
Costs Capitalized Subsequent to Acquisition
Improvements	1.1
Carrying Costs	0
Gross Amounts of Which Carried at Close of Period
Land	9.4
Buildings and Improvements	9.1
Total	18.5
Accumulated Depreciation	(2.3)
Commercial Real Estate | Pearl Highlands Center (HI) | Hawaii | Retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	81.4
Initial Cost
Land	43.4
Buildings and Improvements	96.2
Costs Capitalized Subsequent to Acquisition
Improvements	13.5
Carrying Costs	0
Gross Amounts of Which Carried at Close of Period
Land	43.5
Buildings and Improvements	109.7
Total	153.2
Accumulated Depreciation	(23.9)
Commercial Real Estate | Port Allen Marina Ctr. (HI) | Hawaii | Retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	0
Buildings and Improvements	3.4
Costs Capitalized Subsequent to Acquisition
Improvements	2
Carrying Costs	0
Gross Amounts of Which Carried at Close of Period
Land	0
Buildings and Improvements	5.3
Total	5.3
Accumulated Depreciation	(3.3)
Commercial Real Estate | The Collection (HI) | Hawaii | Retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	0.4
Buildings and Improvements	2.2
Costs Capitalized Subsequent to Acquisition
Improvements	0.8
Carrying Costs	0
Gross Amounts of Which Carried at Close of Period
Land	0.4
Buildings and Improvements	3
Total	3.4
Accumulated Depreciation	(0.2)
Commercial Real Estate | The Shops at Kukui'ula (HI) | Hawaii | Retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	8.9
Buildings and Improvements	30.1
Costs Capitalized Subsequent to Acquisition
Improvements	4.1
Carrying Costs	0
Gross Amounts of Which Carried at Close of Period
Land	9.2
Buildings and Improvements	34.2
Total	43.4
Accumulated Depreciation	(7.6)
Commercial Real Estate | Waianae Mall (HI) | Hawaii | Retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	17.4
Buildings and Improvements	10.1
Costs Capitalized Subsequent to Acquisition
Improvements	5.2
Carrying Costs	0
Gross Amounts of Which Carried at Close of Period
Land	17.7
Buildings and Improvements	15.3
Total	33
Accumulated Depreciation	(3.7)
Commercial Real Estate | Waipio Shopping Center (HI) | Hawaii | Retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	24
Buildings and Improvements	7.6
Costs Capitalized Subsequent to Acquisition
Improvements	1.7
Carrying Costs	0
Gross Amounts of Which Carried at Close of Period
Land	24.3
Buildings and Improvements	9.3
Total	33.6
Accumulated Depreciation	(2.6)
Commercial Real Estate | Lau Hala Shops (HI) | Hawaii | Retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	0
Buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition
Improvements	23.2
Carrying Costs	0
Gross Amounts of Which Carried at Close of Period
Land	14.7
Buildings and Improvements	23.2
Total	37.9
Accumulated Depreciation	(2.2)
Commercial Real Estate | Ho'okele (HI) | Hawaii | Retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	0
Buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition
Improvements	17.5
Carrying Costs	0
Gross Amounts of Which Carried at Close of Period
Land	13.5
Buildings and Improvements	17.5
Total	31
Accumulated Depreciation	(1.3)
Commercial Real Estate | Puunene Shopping Center (HI) | Hawaii | Retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	24.8
Buildings and Improvements	28.6
Costs Capitalized Subsequent to Acquisition
Improvements	7.1
Carrying Costs	0
Gross Amounts of Which Carried at Close of Period
Land	24.8
Buildings and Improvements	35.7
Total	60.5
Accumulated Depreciation	(3.9)
Commercial Real Estate | Queens' Marketplace (HI) | Hawaii | Retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	20.4
Buildings and Improvements	58.9
Costs Capitalized Subsequent to Acquisition
Improvements	1.5
Carrying Costs	0
Gross Amounts of Which Carried at Close of Period
Land	20.4
Buildings and Improvements	60.4
Total	80.8
Accumulated Depreciation	(3)
Commercial Real Estate | Waipouli Town Center (HI) | Hawaii | Retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	5.9
Buildings and Improvements	9.7
Costs Capitalized Subsequent to Acquisition
Improvements	0.9
Carrying Costs	0
Gross Amounts of Which Carried at Close of Period
Land	5.9
Buildings and Improvements	10.6
Total	16.5
Accumulated Depreciation	(0.6)
Commercial Real Estate | Oahu Ground Leases (HI) | Hawaii | Other
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	230.5
Buildings and Improvements	0.1
Costs Capitalized Subsequent to Acquisition
Improvements	(0.1)
Carrying Costs	0
Gross Amounts of Which Carried at Close of Period
Land	230.7
Buildings and Improvements	0
Total	230.7
Accumulated Depreciation	0
Commercial Real Estate | Other miscellaneous investments | Other
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	2.5
Buildings and Improvements	0.1
Costs Capitalized Subsequent to Acquisition
Improvements	9.7
Carrying Costs	0
Gross Amounts of Which Carried at Close of Period
Land	2.8
Buildings and Improvements	9.8
Total	12.6
Accumulated Depreciation	(7)
Land Operations | Hawaii
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	37.9
Buildings and Improvements	0.3
Costs Capitalized Subsequent to Acquisition
Improvements	57.1
Carrying Costs	(0.5)
Gross Amounts of Which Carried at Close of Period
Land	35.2
Buildings and Improvements	56.9
Total	92.1
Accumulated Depreciation	(2.5)
Land Operations | Other miscellaneous investments | Hawaii
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	2
Buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition
Improvements	0.9
Carrying Costs	0
Gross Amounts of Which Carried at Close of Period
Land	1.9
Buildings and Improvements	0.9
Total	2.8
Accumulated Depreciation	(0.5)
Land Operations | Agricultural Land | Hawaii
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	11.3
Buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition
Improvements	0.9
Carrying Costs	0
Gross Amounts of Which Carried at Close of Period
Land	11.3
Buildings and Improvements	0.9
Total	12.2
Accumulated Depreciation	(0.5)
Land Operations | Kahala Portfolio | Hawaii
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	0
Buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition
Improvements	0
Carrying Costs	0
Gross Amounts of Which Carried at Close of Period
Land	0
Buildings and Improvements	0
Total	0
Accumulated Depreciation	0
Land Operations | Kamalani | Hawaii
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	0
Buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition
Improvements	5.1
Carrying Costs	0
Gross Amounts of Which Carried at Close of Period
Land	0
Buildings and Improvements	5.1
Total	5.1
Accumulated Depreciation	0
Land Operations | Kauai Landholdings | Hawaii
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	0
Buildings and Improvements	0.1
Costs Capitalized Subsequent to Acquisition
Improvements	2.5
Carrying Costs	0
Gross Amounts of Which Carried at Close of Period
Land	0
Buildings and Improvements	2.6
Total	2.6
Accumulated Depreciation	(0.8)
Land Operations | Maui Business Park II | Hawaii
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	0
Buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition
Improvements	33
Carrying Costs	0
Gross Amounts of Which Carried at Close of Period
Land	0
Buildings and Improvements	33
Total	33
Accumulated Depreciation	0
Land Operations | Maui Landholdings | Hawaii
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	0.1
Buildings and Improvements	0.2
Costs Capitalized Subsequent to Acquisition
Improvements	6.2
Carrying Costs	0
Gross Amounts of Which Carried at Close of Period
Land	0.1
Buildings and Improvements	6.4
Total	6.5
Accumulated Depreciation	(0.7)
Land Operations | Wailea B-1 | Hawaii
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	4.6
Buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition
Improvements	0
Carrying Costs	0
Gross Amounts of Which Carried at Close of Period
Land	4.6
Buildings and Improvements	0
Total	4.6
Accumulated Depreciation	0
Land Operations | Wailea, other | Hawaii
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	19.9
Buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition
Improvements	8.5
Carrying Costs	(0.5)
Gross Amounts of Which Carried at Close of Period
Land	17.3
Buildings and Improvements	8
Total	25.3
Accumulated Depreciation	$ 0

Schedule III - Real Estate an_3

Schedule III - Real Estate and Accumulated Depreciation - Reconciliations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of Real Estate
Balance at beginning of year	$ 1,619.3	$ 1,447.7	$ 1,325.1
Additions and improvements	20.4	232.8	317.8
Dispositions, retirements and other adjustments	(14.3)	(61.2)	(194.7)
Impairment of assets	0	0	(0.5)
Balance at end of year	1,625.4	1,619.3	1,447.7
Reconciliation of Accumulated Depreciation
Balance at beginning of year	127.5	107.6	133.5
Depreciation expense	27.4	24.3	20.4
Dispositions, retirements and other adjustments	(0.5)	(4.4)	(46.3)
Balance at end of year	$ 154.4	$ 127.5	$ 107.6