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Segment Results - Schedule of Operating Segment Information (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting Information, Profit (Loss) [Abstract]          
Total operating revenue     $ 305.3 $ 435.2 $ 644.4
Total operating profit (loss)     54.7 17.8 (41.4)
Total gain (loss) on disposal of assets, net     0.5 0.0 51.4
Interest expense     (30.3) (33.1) (35.3)
General corporate expenses     (19.3) (23.6) (27.6)
Income (Loss) from Continuing Operations Before Income Taxes     5.6 (38.9) (52.9)
Identifiable assets   $ 2,225.2 2,036.0 2,084.3 2,225.2
Capital expenditures     25.1 255.1 296.1
Depreciation and Amortization     53.3 50.5 42.8
Impairment of assets     5.6 49.7 268.0
Goodwill impairment $ 49.7 37.2   49.7  
Commercial Real Estate          
Segment Reporting Information, Profit (Loss) [Abstract]          
Commercial Real Estate     150.0 160.6 140.3
Total operating profit (loss)     49.8 66.2 58.5
Goodwill impairment       0.0  
Land Operations          
Segment Reporting Information, Profit (Loss) [Abstract]          
Revenues     40.6 114.1 289.5
Total operating profit (loss)     17.3 20.8 (26.7)
Impairment of assets         186.8
Materials & Construction          
Segment Reporting Information, Profit (Loss) [Abstract]          
Revenues     114.7 160.5 214.6
Total operating profit (loss)     (12.4) (69.2) (73.2)
Goodwill impairment     5.6 49.7  
Operating Segments | Commercial Real Estate          
Segment Reporting Information, Profit (Loss) [Abstract]          
Identifiable assets   1,530.4 1,499.9 1,532.6 1,530.4
Capital expenditures     18.8 250.5 282.7
Depreciation and Amortization     40.1 36.7 28.0
Operating Segments | Land Operations          
Segment Reporting Information, Profit (Loss) [Abstract]          
Identifiable assets   350.0 258.4 282.5 350.0
Capital expenditures     1.4 2.3 1.4
Depreciation and Amortization     1.5 1.6 1.9
Operating Segments | Materials & Construction          
Segment Reporting Information, Profit (Loss) [Abstract]          
Identifiable assets   297.1 211.9 243.0 297.1
Capital expenditures     4.5 1.9 11.0
Depreciation and Amortization     10.8 11.4 12.1
Other          
Segment Reporting Information, Profit (Loss) [Abstract]          
Identifiable assets   $ 47.7 65.8 26.2 47.7
Capital expenditures     0.4 0.4 1.0
Depreciation and Amortization     $ 0.9 $ 0.8 $ 0.8