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Real Estate - Real Estate (Details) - USD ($)
$ in Millions
9 Months Ended
Jun. 30, 2019
Sep. 30, 2018
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]    
Payments to Acquire Residential Real Estate $ 476.9  
Payments to Develop Real Estate Assets 202.3  
Real estate 1,049.5 $ 498.0
Developed and under development projects    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]    
Real estate 988.7 463.1
Land [Member]    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]    
Real estate $ 60.8 $ 34.9
Minimum [Member] | D.R. Horton, Inc. [Member]    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]    
Investment Interest Rate 12.00%  
Maximum [Member] | D.R. Horton, Inc. [Member]    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]    
Investment Interest Rate 16.00%