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Real Estate - Text (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Sep. 30, 2023
Real Estate Properties [Line Items]          
Real estate $ 2,115.9   $ 2,115.9   $ 1,790.3
Payments to Acquire Residential Real Estate     350.0    
Payments to Develop Real Estate Assets     450.3    
Asset Impairment Charges 0.0 $ 19.4 0.0 $ 19.4  
Loss on Contract Termination 0.2 $ 0.9 0.4 $ 3.3  
Developed and under development projects          
Real Estate Properties [Line Items]          
Real estate 1,981.1   1,981.1   1,760.8
Land held for future development          
Real Estate Properties [Line Items]          
Real estate $ 134.8   $ 134.8   $ 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%