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Goodwill - Schedule of Goodwill (Details) - USD ($)
 3 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Goodwill [Roll Forward]        
Gross amount of goodwill     $ 102,300,000 $ 102,300,000
Accumulated impairment losses     (86,900,000) (37,200,000)
Goodwill, Beginning Balance     15,400,000 65,100,000
Impairment losses $ (49,700,000) $ (37,200,000)   (49,700,000)
Gross amount of goodwill included in disposal     (7,100,000)  
Accumulated impairment losses included in disposal     2,200,000  
Gross amount of goodwill   102,300,000 95,200,000 102,300,000
Accumulated impairment losses   (37,200,000) (84,700,000) (86,900,000)
Goodwill, Ending Balance   65,100,000 10,500,000 15,400,000
Materials and Construction Segment        
Goodwill [Roll Forward]        
Gross amount of goodwill     93,600,000 93,600,000
Accumulated impairment losses     (86,900,000) (37,200,000)
Goodwill, Beginning Balance     6,700,000 56,400,000
Impairment losses       (49,700,000)
Gross amount of goodwill included in disposal     (7,100,000)  
Accumulated impairment losses included in disposal     2,200,000  
Gross amount of goodwill   93,600,000 86,500,000 93,600,000
Accumulated impairment losses   (37,200,000) (84,700,000) (86,900,000)
Goodwill, Ending Balance   56,400,000 1,800,000 6,700,000
Commercial property        
Goodwill [Roll Forward]        
Gross amount of goodwill     8,700,000 8,700,000
Accumulated impairment losses     0 0
Goodwill, Beginning Balance     8,700,000 8,700,000
Impairment losses       0
Gross amount of goodwill included in disposal     0  
Accumulated impairment losses included in disposal     0  
Gross amount of goodwill   8,700,000 8,700,000 8,700,000
Accumulated impairment losses   0 0 0
Goodwill, Ending Balance   $ 8,700,000 8,700,000 $ 8,700,000
Land Operations        
Goodwill [Roll Forward]        
Goodwill, Ending Balance     $ 0