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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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