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Segment Results - Schedule of Operating Segment Information (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Segment Reporting Information, Profit (Loss) [Abstract]        
Total operating revenue   $ 208.9 $ 230.5 $ 254.0
Total segment operating profit (loss)   92.0 80.1 125.8
Gain (loss) on disposal of commercial real estate properties, net   0.0 0.0 2.8
Interest expense   (23.0) (22.0) (26.2)
Corporate and other expense   (28.2) (39.3) (27.0)
Income (Loss) from Continuing Operations Before Income Taxes   40.8 18.8 75.4
Total assets $ 1,879.8 1,646.2 1,787.3 1,879.8
Capital expenditures   31.2 21.7 47.2
Depreciation and Amortization   36.8 38.0 39.6
Pension termination charges   0.0 76.9 0.0
Income (loss) related to joint ventures 5.5 1.9 1.6 17.9
Gain (loss) on disposal of non-core assets, net   1.1 54.0 0.1
Scenario, Adjustment        
Segment Reporting Information, Profit (Loss) [Abstract]        
Total segment operating profit (loss)       38.3
Disposal Group, Not Discontinued Operations | McBryde Resources, Inc.,        
Segment Reporting Information, Profit (Loss) [Abstract]        
Pension termination charges     62.2  
Gain (loss) on disposal of non-core assets, net     54.0  
Commercial Real Estate        
Segment Reporting Information, Profit (Loss) [Abstract]        
Commercial Real Estate   194.0 187.2 174.1
Total segment operating profit (loss)   81.2 81.5 72.6
Land Operations        
Segment Reporting Information, Profit (Loss) [Abstract]        
Land operations   14.9 43.3 79.9
Total segment operating profit (loss)   10.8 (1.4) 53.2
Land Operations | Scenario, Adjustment        
Segment Reporting Information, Profit (Loss) [Abstract]        
Total segment operating profit (loss)     (2.5)  
Operating Segments | Discontinued Operations        
Segment Reporting Information, Profit (Loss) [Abstract]        
Total assets 154.7 14.0 126.8 154.7
Operating Segments | Commercial Real Estate        
Segment Reporting Information, Profit (Loss) [Abstract]        
Capital expenditures   31.2 21.4 39.6
Depreciation and Amortization   36.5 36.5 37.7
Pension termination charges     0.7  
Operating Segments | Commercial Real Estate | Continuing Operations        
Segment Reporting Information, Profit (Loss) [Abstract]        
Total assets 1,499.5 1,479.8 1,499.9 1,499.5
Operating Segments | Land Operations        
Segment Reporting Information, Profit (Loss) [Abstract]        
Capital expenditures   0.0 0.2 7.4
Depreciation and Amortization   0.0 1.2 1.1
Operating Segments | Land Operations | Scenario, Adjustment        
Segment Reporting Information, Profit (Loss) [Abstract]        
Total assets 23.4     23.4
Operating Segments | Land Operations | Continuing Operations        
Segment Reporting Information, Profit (Loss) [Abstract]        
Total assets 144.5 112.4 112.0 144.5
Corporate        
Segment Reporting Information, Profit (Loss) [Abstract]        
Capital expenditures   0.0 0.1 0.2
Depreciation and Amortization   0.3 0.3 0.8
Pension termination charges     14.0  
Corporate | Continuing Operations        
Segment Reporting Information, Profit (Loss) [Abstract]        
Total assets $ 81.1 $ 40.0 $ 48.6 $ 81.1