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Segment Results - Schedule of Operating Segment Information (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Segment Reporting Information, Profit (Loss) [Abstract] |  |
Total operating revenue | $ 80.8 | $ 129.4
Gain (loss) on the sale of commercial real estate properties | 0.5 | 0.0
Interest expense | (7.8) | (9.1)
Income (Loss) from Continuing Operations Before Income Taxes | 5.8 | 8.4
Commercial Real Estate |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |
Commercial Real Estate | 43.4 | 36.8
Land Operations |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |
Revenues | 11.5 | 49.0
Materials & Construction |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |
Revenues | 25.9 | 43.6
Operating Segments |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |
Total operating revenue | 80.8 | 129.4
Total operating profit (loss) | 19.3 | 23.7
Gain (loss) on the sale of commercial real estate properties | 0.5 | 0.0
Interest expense | (7.8) | (9.1)
Operating Segments | Commercial Real Estate |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |
Commercial Real Estate | 43.4 | 36.8
Total operating profit (loss) | 18.1 | 15.6
Operating Segments | Land Operations |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |
Revenues | 11.5 | 49.0
Total operating profit (loss) | 5.0 | 12.6
Operating Segments | Materials & Construction |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |
Revenues | 25.9 | 43.6
Total operating profit (loss) | (3.8) | (4.5)
Other |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |
General corporate expenses | $ (6.2) | $ (6.2)

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