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Real Estate - Real Estate (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Sep. 30, 2021
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]      
Inventory, Real Estate, Land and Land Development Costs $ 1,960.1   $ 1,905.2
Payments to Acquire Residential Real Estate 135.2    
Payments to Develop Real Estate Assets 244.8    
Due Diligence Write-Offs $ 0.6 $ 0.4  
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]      
Inventory, Real Estate, Land and Land Development Costs $ 1,854.6   1,824.7
Land [Member]      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]      
Inventory, Real Estate, Land and Land Development Costs $ 105.5   $ 80.5