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Schedule III - Real Estate and Accumulated Depreciation (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Gross Amounts of Which Carried at Close of Period        
Total $ 1,667.1 $ 1,658.8 $ 1,653.2 $ 1,625.4
Accumulated Depreciation (227.3) $ (202.3) $ (180.5) $ (154.4)
Aggregate tax basis $ 675.4      
Minimum | Building and improvements        
Gross Amounts of Which Carried at Close of Period        
Estimated useful life or lease term 10 years      
Property, plant and equipment, useful life 10 years      
Minimum | Leasehold improvements        
Gross Amounts of Which Carried at Close of Period        
Estimated useful life or lease term 5 years      
Property, plant and equipment, useful life 5 years      
Maximum | Building and improvements        
Gross Amounts of Which Carried at Close of Period        
Estimated useful life or lease term 40 years      
Property, plant and equipment, useful life 40 years      
Maximum | Leasehold improvements        
Gross Amounts of Which Carried at Close of Period        
Estimated useful life or lease term 10 years      
Property, plant and equipment, useful life 10 years      
Commercial Real Estate        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 189.7      
Initial Cost        
Land 730.3      
Buildings and Improvements 608.3      
Costs Capitalized Subsequent to Acquisition        
Improvements 262.6      
Carrying Costs 0.0      
Gross Amounts of Which Carried at Close of Period        
Land 773.5      
Buildings and Improvements 827.7      
Total 1,601.2      
Accumulated Depreciation (226.8)      
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 0.0      
Initial Cost        
Land 7.9      
Buildings and Improvements 16.8      
Costs Capitalized Subsequent to Acquisition        
Improvements 0.7      
Carrying Costs 0.0      
Gross Amounts of Which Carried at Close of Period        
Land 7.9      
Buildings and Improvements 17.5      
Total 25.4      
Accumulated Depreciation (2.7)      
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 0.0      
Initial Cost        
Land 0.1      
Buildings and Improvements 0.0      
Costs Capitalized Subsequent to Acquisition        
Improvements 1.3      
Carrying Costs 0.0      
Gross Amounts of Which Carried at Close of Period        
Land 0.1      
Buildings and Improvements 1.3      
Total 1.4      
Accumulated Depreciation (1.2)      
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 0.0      
Initial Cost        
Land 5.0      
Buildings and Improvements 4.8      
Costs Capitalized Subsequent to Acquisition        
Improvements 0.1      
Carrying Costs 0.0      
Gross Amounts of Which Carried at Close of Period        
Land 5.0      
Buildings and Improvements 4.9      
Total 9.9      
Accumulated Depreciation (0.9)      
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 0.0      
Initial Cost        
Land 10.5      
Buildings and Improvements 2.0      
Costs Capitalized Subsequent to Acquisition        
Improvements 1.2      
Carrying Costs 0.0      
Gross Amounts of Which Carried at Close of Period        
Land 10.6      
Buildings and Improvements 3.1      
Total 13.7      
Accumulated Depreciation (0.8)      
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 1.7      
Initial Cost        
Land 16.9      
Buildings and Improvements 20.6      
Costs Capitalized Subsequent to Acquisition        
Improvements 5.7      
Carrying Costs 0.0      
Gross Amounts of Which Carried at Close of Period        
Land 16.9      
Buildings and Improvements 26.3      
Total 43.2      
Accumulated Depreciation (5.2)      
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 0.0      
Initial Cost        
Land 25.2      
Buildings and Improvements 10.8      
Costs Capitalized Subsequent to Acquisition        
Improvements 1.9      
Carrying Costs 0.0      
Gross Amounts of Which Carried at Close of Period        
Land 25.4      
Buildings and Improvements 12.5      
Total 37.9      
Accumulated Depreciation (4.7)      
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 0.0      
Initial Cost        
Land 10.9      
Buildings and Improvements 27.1      
Costs Capitalized Subsequent to Acquisition        
Improvements 0.0      
Carrying Costs 0.0      
Gross Amounts of Which Carried at Close of Period        
Land 10.9      
Buildings and Improvements 27.1      
Total 38.0      
Accumulated Depreciation (3.6)      
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 0.0      
Initial Cost        
Land 0.0      
Buildings and Improvements 0.0      
Costs Capitalized Subsequent to Acquisition        
Improvements 1.8      
Carrying Costs 0.0      
Gross Amounts of Which Carried at Close of Period        
Land 0.0      
Buildings and Improvements 1.8      
Total 1.8      
Accumulated Depreciation (0.9)      
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 0.0      
Initial Cost        
Land 0.0      
Buildings and Improvements 0.7      
Costs Capitalized Subsequent to Acquisition        
Improvements 2.3      
Carrying Costs 0.0      
Gross Amounts of Which Carried at Close of Period        
Land 0.0      
Buildings and Improvements 3.0      
Total 3.0      
Accumulated Depreciation (2.4)      
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 0.0      
Initial Cost        
Land 19.6      
Buildings and Improvements 7.7      
Costs Capitalized Subsequent to Acquisition        
Improvements 1.6      
Carrying Costs 0.0      
Gross Amounts of Which Carried at Close of Period        
Land 19.7      
Buildings and Improvements 9.2      
Total 28.9      
Accumulated Depreciation (3.3)      
Commercial Real Estate | Kahai Street Industrial (HI) | Hawaii | Industrial        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0.0      
Initial Cost        
Land 4.4      
Buildings and Improvements 2.0      
Costs Capitalized Subsequent to Acquisition        
Improvements 0.0      
Carrying Costs 0.0      
Gross Amounts of Which Carried at Close of Period        
Land 4.4      
Buildings and Improvements 2.0      
Total 6.4      
Accumulated Depreciation (0.1)      
Commercial Real Estate | Maui Lani Industrial (HI) | Hawaii | Industrial        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0.0      
Initial Cost        
Land 0.2      
Buildings and Improvements 0.3      
Costs Capitalized Subsequent to Acquisition        
Improvements 0.0      
Carrying Costs 0.0      
Gross Amounts of Which Carried at Close of Period        
Land 0.2      
Buildings and Improvements 0.3      
Total 0.5      
Accumulated Depreciation 0.0      
Commercial Real Estate | Kaomi Loop (HI) | Hawaii | Industrial        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0.0      
Initial Cost        
Land 3.3      
Buildings and Improvements 5.8      
Costs Capitalized Subsequent to Acquisition        
Improvements 0.0      
Carrying Costs 0.0      
Gross Amounts of Which Carried at Close of Period        
Land 3.3      
Buildings and Improvements 5.8      
Total 9.1      
Accumulated Depreciation (0.1)      
Commercial Real Estate | Kahului Office Building (HI) | Hawaii | Office Properties        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0.0      
Initial Cost        
Land 1.0      
Buildings and Improvements 0.4      
Costs Capitalized Subsequent to Acquisition        
Improvements 8.1      
Carrying Costs 0.0      
Gross Amounts of Which Carried at Close of Period        
Land 1.0      
Buildings and Improvements 8.5      
Total 9.5      
Accumulated Depreciation (7.8)      
Commercial Real Estate | Kahului Office Center (HI) | Hawaii | Office Properties        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0.0      
Initial Cost        
Land 0.0      
Buildings and Improvements 0.0      
Costs Capitalized Subsequent to Acquisition        
Improvements 4.8      
Carrying Costs 0.0      
Gross Amounts of Which Carried at Close of Period        
Land 0.0      
Buildings and Improvements 4.8      
Total 4.8      
Accumulated Depreciation (4.1)      
Commercial Real Estate | Lono Center (HI) | Hawaii | Office Properties        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0.0      
Initial Cost        
Land 0.0      
Buildings and Improvements 1.4      
Costs Capitalized Subsequent to Acquisition        
Improvements 1.6      
Carrying Costs 0.0      
Gross Amounts of Which Carried at Close of Period        
Land 0.0      
Buildings and Improvements 3.0      
Total 3.0      
Accumulated Depreciation (1.9)      
Commercial Real Estate | Gateway at Mililani Mauka South (HI) | Hawaii | Office Properties        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0.0      
Initial Cost        
Land 7.0      
Buildings and Improvements 3.5      
Costs Capitalized Subsequent to Acquisition        
Improvements 7.5      
Carrying Costs 0.0      
Gross Amounts of Which Carried at Close of Period        
Land 7.0      
Buildings and Improvements 11.0      
Total 18.0      
Accumulated Depreciation (2.8)      
Commercial Real Estate | Aikahi Park Shopping Center (HI) | Hawaii | Retail Centers        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0.0      
Initial Cost        
Land 23.5      
Buildings and Improvements 6.7      
Costs Capitalized Subsequent to Acquisition        
Improvements 20.7      
Carrying Costs 0.0      
Gross Amounts of Which Carried at Close of Period        
Land 26.0      
Buildings and Improvements 24.9      
Total 50.9      
Accumulated Depreciation (6.3)      
Commercial Real Estate | Gateway at Mililani Mauka (HI) | Hawaii | Retail Centers        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0.0      
Initial Cost        
Land 7.3      
Buildings and Improvements 4.7      
Costs Capitalized Subsequent to Acquisition        
Improvements 7.1      
Carrying Costs 0.0      
Gross Amounts of Which Carried at Close of Period        
Land 7.8      
Buildings and Improvements 11.3      
Total 19.1      
Accumulated Depreciation (3.2)      
Commercial Real Estate | Hokulei Street (HI) | Hawaii | Retail Centers        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0.0      
Initial Cost        
Land 16.9      
Buildings and Improvements 36.5      
Costs Capitalized Subsequent to Acquisition        
Improvements 3.2      
Carrying Costs 0.0      
Gross Amounts of Which Carried at Close of Period        
Land 17.0      
Buildings and Improvements 39.6      
Total 56.6      
Accumulated Depreciation (7.4)      
Commercial Real Estate | Kahului Shopping Center (HI) | Hawaii | Retail Centers        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0.0      
Initial Cost        
Land 0.0      
Buildings and Improvements 0.0      
Costs Capitalized Subsequent to Acquisition        
Improvements 3.8      
Carrying Costs 0.0      
Gross Amounts of Which Carried at Close of Period        
Land 0.6      
Buildings and Improvements 3.2      
Total 3.8      
Accumulated Depreciation (2.6)      
Commercial Real Estate | Kailua Retail Other (HI) | Hawaii | Retail Centers        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0.0      
Initial Cost        
Land 85.1      
Buildings and Improvements 73.8      
Costs Capitalized Subsequent to Acquisition        
Improvements 22.2      
Carrying Costs 0.0      
Gross Amounts of Which Carried at Close of Period        
Land 88.2      
Buildings and Improvements 92.9      
Total 181.1      
Accumulated Depreciation (27.6)      
Commercial Real Estate | Kaneohe Bay Shopping Ctr. (HI) | Hawaii | Retail Centers        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0.0      
Initial Cost        
Land 0.0      
Buildings and Improvements 13.4      
Costs Capitalized Subsequent to Acquisition        
Improvements 5.0      
Carrying Costs 0.0      
Gross Amounts of Which Carried at Close of Period        
Land 1.5      
Buildings and Improvements 16.9      
Total 18.4      
Accumulated Depreciation (9.3)      
Commercial Real Estate | Kunia Shopping Center (HI) | Hawaii | Retail Centers        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0.0      
Initial Cost        
Land 2.7      
Buildings and Improvements 10.6      
Costs Capitalized Subsequent to Acquisition        
Improvements 3.1      
Carrying Costs 0.0      
Gross Amounts of Which Carried at Close of Period        
Land 3.0      
Buildings and Improvements 13.4      
Total 16.4      
Accumulated Depreciation (6.6)      
Commercial Real Estate | Lanihau Marketplace (HI) | Hawaii | Retail Centers        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0.0      
Initial Cost        
Land 9.4      
Buildings and Improvements 13.2      
Costs Capitalized Subsequent to Acquisition        
Improvements 3.2      
Carrying Costs 0.0      
Gross Amounts of Which Carried at Close of Period        
Land 9.8      
Buildings and Improvements 16.0      
Total 25.8      
Accumulated Depreciation (6.2)      
Commercial Real Estate | Laulani Village (HI) | Hawaii | Retail Centers        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 57.8      
Initial Cost        
Land 43.4      
Buildings and Improvements 64.3      
Costs Capitalized Subsequent to Acquisition        
Improvements 3.5      
Carrying Costs 0.0      
Gross Amounts of Which Carried at Close of Period        
Land 43.5      
Buildings and Improvements 67.7      
Total 111.2      
Accumulated Depreciation (12.0)      
Commercial Real Estate | Manoa Marketplace (HI) | Hawaii | Retail Centers        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 52.7      
Initial Cost        
Land 43.3      
Buildings and Improvements 35.9      
Costs Capitalized Subsequent to Acquisition        
Improvements 19.9      
Carrying Costs 0.0      
Gross Amounts of Which Carried at Close of Period        
Land 45.1      
Buildings and Improvements 54.0      
Total 99.1      
Accumulated Depreciation (9.7)      
Commercial Real Estate | Napili Plaza (HI) | Hawaii | Retail Centers        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0.0      
Initial Cost        
Land 9.4      
Buildings and Improvements 8.0      
Costs Capitalized Subsequent to Acquisition        
Improvements 3.2      
Carrying Costs 0.0      
Gross Amounts of Which Carried at Close of Period        
Land 10.0      
Buildings and Improvements 10.6      
Total 20.6      
Accumulated Depreciation (3.3)      
Commercial Real Estate | Pearl Highlands Center (HI) | Hawaii | Retail Centers        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 77.5      
Initial Cost        
Land 43.4      
Buildings and Improvements 96.2      
Costs Capitalized Subsequent to Acquisition        
Improvements 18.0      
Carrying Costs 0.0      
Gross Amounts of Which Carried at Close of Period        
Land 43.6      
Buildings and Improvements 114.0      
Total 157.6      
Accumulated Depreciation (34.7)      
Commercial Real Estate | Port Allen Marina Ctr. (HI) | Hawaii | Retail Centers        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0.0      
Initial Cost        
Land 0.0      
Buildings and Improvements 3.4      
Costs Capitalized Subsequent to Acquisition        
Improvements 1.1      
Carrying Costs 0.0      
Gross Amounts of Which Carried at Close of Period        
Land 0.0      
Buildings and Improvements 4.5      
Total 4.5      
Accumulated Depreciation (2.8)      
Commercial Real Estate | The Collection (HI) | Hawaii | Retail Centers        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0.0      
Initial Cost        
Land 0.4      
Buildings and Improvements 2.2      
Costs Capitalized Subsequent to Acquisition        
Improvements 0.9      
Carrying Costs 0.0      
Gross Amounts of Which Carried at Close of Period        
Land 0.4      
Buildings and Improvements 3.1      
Total 3.5      
Accumulated Depreciation (0.6)      
Commercial Real Estate | The Shops at Kukui'ula (HI) | Hawaii | Retail Centers        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0.0      
Initial Cost        
Land 8.9      
Buildings and Improvements 30.1      
Costs Capitalized Subsequent to Acquisition        
Improvements 7.6      
Carrying Costs 0.0      
Gross Amounts of Which Carried at Close of Period        
Land 9.5      
Buildings and Improvements 37.1      
Total 46.6      
Accumulated Depreciation (11.1)      
Commercial Real Estate | Waianae Mall (HI) | Hawaii | Retail Centers        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0.0      
Initial Cost        
Land 17.4      
Buildings and Improvements 10.1      
Costs Capitalized Subsequent to Acquisition        
Improvements 9.8      
Carrying Costs 0.0      
Gross Amounts of Which Carried at Close of Period        
Land 18.0      
Buildings and Improvements 19.3      
Total 37.3      
Accumulated Depreciation (6.2)      
Commercial Real Estate | Waipio Shopping Center (HI) | Hawaii | Retail Centers        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0.0      
Initial Cost        
Land 24.0      
Buildings and Improvements 7.6      
Costs Capitalized Subsequent to Acquisition        
Improvements 2.4      
Carrying Costs 0.0      
Gross Amounts of Which Carried at Close of Period        
Land 24.5      
Buildings and Improvements 9.5      
Total 34.0      
Accumulated Depreciation (3.6)      
Commercial Real Estate | Lau Hala Shops (HI) | Hawaii | Retail Centers        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0.0      
Initial Cost        
Land 0.0      
Buildings and Improvements 0.0      
Costs Capitalized Subsequent to Acquisition        
Improvements 40.7      
Carrying Costs 0.0      
Gross Amounts of Which Carried at Close of Period        
Land 15.2      
Buildings and Improvements 25.5      
Total 40.7      
Accumulated Depreciation (5.7)      
Commercial Real Estate | Ho'okele (HI) | Hawaii | Retail Centers        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0.0      
Initial Cost        
Land 0.0      
Buildings and Improvements 0.0      
Costs Capitalized Subsequent to Acquisition        
Improvements 31.4      
Carrying Costs 0.0      
Gross Amounts of Which Carried at Close of Period        
Land 13.5      
Buildings and Improvements 17.9      
Total 31.4      
Accumulated Depreciation (4.2)      
Commercial Real Estate | Puunene Shopping Center (HI) | Hawaii | Retail Centers        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0.0      
Initial Cost        
Land 24.8      
Buildings and Improvements 28.6      
Costs Capitalized Subsequent to Acquisition        
Improvements 8.1      
Carrying Costs 0.0      
Gross Amounts of Which Carried at Close of Period        
Land 25.2      
Buildings and Improvements 36.3      
Total 61.5      
Accumulated Depreciation (8.6)      
Commercial Real Estate | Queens' Marketplace (HI) | Hawaii | Retail Centers        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0.0      
Initial Cost        
Land 20.4      
Buildings and Improvements 58.9      
Costs Capitalized Subsequent to Acquisition        
Improvements 1.9      
Carrying Costs 0.0      
Gross Amounts of Which Carried at Close of Period        
Land 20.4      
Buildings and Improvements 60.8      
Total 81.2      
Accumulated Depreciation (8.2)      
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 0.0      
Initial Cost        
Land 235.5      
Buildings and Improvements 0.1      
Costs Capitalized Subsequent to Acquisition        
Improvements 0.1      
Carrying Costs 0.0      
Gross Amounts of Which Carried at Close of Period        
Land 235.7      
Buildings and Improvements 0.0      
Total 235.7      
Accumulated Depreciation 0.0      
Commercial Real Estate | Other non-core landholdings | Other        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0.0      
Initial Cost        
Land 2.5      
Buildings and Improvements 0.1      
Costs Capitalized Subsequent to Acquisition        
Improvements 7.1      
Carrying Costs 0.0      
Gross Amounts of Which Carried at Close of Period        
Land 2.6      
Buildings and Improvements 7.1      
Total 9.7      
Accumulated Depreciation 4.4      
Land Operations | Hawaii        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0.0      
Initial Cost        
Land 37.0      
Buildings and Improvements 0.0      
Costs Capitalized Subsequent to Acquisition        
Improvements 37.0      
Carrying Costs (8.3)      
Gross Amounts of Which Carried at Close of Period        
Land 29.6      
Buildings and Improvements 36.3      
Total 65.9      
Accumulated Depreciation (0.5)      
Land Operations | Kapolei Business Park West | Hawaii        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0.0      
Initial Cost        
Land 6.2      
Buildings and Improvements 0.0      
Costs Capitalized Subsequent to Acquisition        
Improvements 0.0      
Carrying Costs 0.0      
Gross Amounts of Which Carried at Close of Period        
Land 6.2      
Buildings and Improvements 0.0      
Total 6.2      
Accumulated Depreciation 0.0      
Land Operations | Kamalani | Hawaii        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0.0      
Initial Cost        
Land 0.0      
Buildings and Improvements 0.0      
Costs Capitalized Subsequent to Acquisition        
Improvements 5.2      
Carrying Costs 0.0      
Gross Amounts of Which Carried at Close of Period        
Land 0.0      
Buildings and Improvements 5.2      
Total 5.2      
Accumulated Depreciation 0.0      
Land Operations | Maui Business Park II | Hawaii        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0.0      
Initial Cost        
Land 0.0      
Buildings and Improvements 0.0      
Costs Capitalized Subsequent to Acquisition        
Improvements 20.3      
Carrying Costs 0.0      
Gross Amounts of Which Carried at Close of Period        
Land 0.0      
Buildings and Improvements 20.3      
Total 20.3      
Accumulated Depreciation 0.0      
Land Operations | Wailea | Hawaii        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0.0      
Initial Cost        
Land 24.5      
Buildings and Improvements 0.0      
Costs Capitalized Subsequent to Acquisition        
Improvements 9.5      
Carrying Costs (3.1)      
Gross Amounts of Which Carried at Close of Period        
Land 21.9      
Buildings and Improvements 9.0      
Total 30.9      
Accumulated Depreciation 0.0      
Land Operations | Other non-core landholdings | Hawaii        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0.0      
Initial Cost        
Land 6.3      
Buildings and Improvements 0.0      
Costs Capitalized Subsequent to Acquisition        
Improvements 2.0      
Carrying Costs (5.2)      
Gross Amounts of Which Carried at Close of Period        
Land 1.5      
Buildings and Improvements 1.8      
Total 3.3      
Accumulated Depreciation $ (0.5)