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Real Estate - Real Estate (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Sep. 30, 2021
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]          
Real estate $ 1,960.5   $ 1,960.5   $ 1,905.2
Payments to Acquire Residential Real Estate     220.4    
Payments to Develop Real Estate Assets     495.4    
Asset Impairment Charges 3.8        
Real Estate Carrying Value 8.8   8.8    
Due Diligence Write-Offs 1.6 $ 0.6 $ 2.2 $ 0.9  
D.R. Horton, Inc. [Member] | Maximum [Member]          
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]          
Related Party Transaction, Rate     16.00%    
D.R. Horton, Inc. [Member] | Minimum [Member]          
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]          
Related Party Transaction, Rate     12.00%    
Developed and under development projects          
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]          
Real estate 1,861.7   $ 1,861.7   1,824.7
Land [Member]          
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]          
Real estate $ 98.8   $ 98.8   $ 80.5