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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	23.0	24.5	24.7
Commercial Real Estate
Disaggregation of Revenue [Line Items]
Commercial Real Estate	150.0	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

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