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Real Estate - Text (Detail) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Sep. 30, 2023
Real Estate Properties [Line Items]      
Real estate $ 2,009.8   $ 1,790.3
Payments to Acquire Residential Real Estate 228.0    
Payments to Develop Real Estate Assets 226.5    
Asset Impairment Charges 0.0 $ 0.0  
Due Diligence Write-Offs 0.2 $ 2.4  
Developed and under development projects      
Real Estate Properties [Line Items]      
Real estate 1,895.7   1,760.8
Land held for future development      
Real Estate Properties [Line Items]      
Real estate $ 114.1   $ 29.5
D.R. Horton, Inc. [Member] | Maximum      
Real Estate Properties [Line Items]      
Related Party Transaction, Rate 16.00%    
D.R. Horton, Inc. [Member] | Minimum      
Real Estate Properties [Line Items]      
Related Party Transaction, Rate 12.00%