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Real Estate - Real Estate (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Sep. 30, 2019
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]          
Payments to Acquire Residential Real Estate     $ 385.3    
Payments to Develop Real Estate Assets     348.6    
Real estate $ 1,287.1   1,287.1   $ 1,028.9
Due Diligence Write-Offs 0.1 $ 0.1 $ 0.5 $ 0.1  
D.R. Horton, Inc. [Member]          
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]          
Related Party Transaction, Rate     16.00%    
Developed and under development projects          
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]          
Real estate 1,271.7   $ 1,271.7   1,011.8
Land [Member]          
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]          
Real estate $ 15.4   $ 15.4   $ 17.1