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Real Estate - Real Estate (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2020
Dec. 31, 2019
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 $ 295.1    
Payments to Develop Real Estate Assets 181.9    
Real estate 1,540.5   $ 1,309.7
Due Diligence Write-Offs $ 0.4 $ 0.3  
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 $ 1,485.0   1,304.3
Land [Member]      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]      
Real estate $ 55.5   $ 5.4