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Real Estate - Real Estate (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Sep. 30, 2020
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]          
Payments to Acquire Residential Real Estate     $ 484.6    
Payments to Develop Real Estate Assets     369.4    
Real estate $ 1,698.6   1,698.6   $ 1,309.7
Inventory, Land Held for Development and Sale 55.5   55.5   5.4
Due Diligence Write-Offs 0.6 $ 0.1 $ 0.9 $ 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]          
Real estate $ 1,643.1   $ 1,643.1   $ 1,304.3