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Revenue and Contract Balances - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Total operating revenue	$ 208.9	$ 230.5	$ 254.0
Commercial Real Estate
Disaggregation of Revenue [Line Items]
Commercial Real Estate	194.0	187.2	174.1
Land Operations
Disaggregation of Revenue [Line Items]
Revenues	14.9	43.3	79.9
Land Operations | Development sales revenue
Disaggregation of Revenue [Line Items]
Revenues	0.0	8.1	16.0
Land Operations | Unimproved/other property sales revenue
Disaggregation of Revenue [Line Items]
Revenues	12.3	19.9	41.3
Land Operations | Other operating revenue
Disaggregation of Revenue [Line Items]
Revenues	$ 2.6	$ 15.3	$ 22.6

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

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