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Revenue and Contract Balances - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Total operating revenue	$ 52.5	$ 49.4	$ 156.0	$ 159.7
Commercial Real Estate
Disaggregation of Revenue [Line Items]
Commercial Real Estate	48.2	46.5	145.6	138.8
Land Operations
Disaggregation of Revenue [Line Items]
Land Operations	4.3	2.9	10.4	20.9
Land Operations | Development sales revenue
Disaggregation of Revenue [Line Items]
Land Operations	0.0	0.0	0.0	6.3
Land Operations | Unimproved/other property sales revenue
Disaggregation of Revenue [Line Items]
Land Operations	4.0	0.0	8.1	2.0
Land Operations | Other operating revenue
Disaggregation of Revenue [Line Items]
Land Operations	$ 0.3	$ 2.9	$ 2.3	$ 12.6

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The total amount of revenue recognized for the period from real estate leasing operations.

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