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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	(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)	218.0
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	62.0
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)	$ 0.0	16.2
Unsecured debt | Bank syndicated loan
Debt Instrument [Line Items]
Total Debt (contractual)	$ 50.0	50.0
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)	$ 10.0	10.0
Unsecured debt | Series B Note
Debt Instrument [Line Items]
Stated interest rate	5.55%
Total Debt (contractual)	$ 46.0	46.0
Unsecured debt | Series C Note
Debt Instrument [Line Items]
Stated interest rate	5.56%
Total Debt (contractual)	$ 22.0	23.0
Unsecured debt | Series F Note
Debt Instrument [Line Items]
Stated interest rate	4.35%
Total Debt (contractual)	$ 19.7	22.0
Unsecured debt | Series H Note
Debt Instrument [Line Items]
Stated interest rate	4.04%
Total Debt (contractual)	$ 50.0	50.0
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	35.0
Unsecured debt | Series L Note
Debt Instrument [Line Items]
Stated interest rate	4.89%
Total Debt (contractual)	$ 18.0	18.0
Unsecured debt | Series I Note
Debt Instrument [Line Items]
Stated interest rate	4.16%
Total Debt (contractual)	$ 25.0	25.0
Unsecured debt | Term Loan 5
Debt Instrument [Line Items]
Stated interest rate	4.30%				4.30%
Total Debt (contractual)	$ 25.0	25.0	$ 25.0		$ 25.0
Revolving Credit Facility
Debt Instrument [Line Items]
Total Debt (contractual)	111.0	98.7
Total debt (carrying value)	111.0
Revolving Credit Facility | GLP Asphalt revolving credit facility
Debt Instrument [Line Items]
Total Debt (contractual)	$ 0.0	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)	$ 111.0	$ 98.7
Revolving Credit Facility | A&B Revolver | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	2.05%

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