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Notes Payable - Forestar Textuals (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Sep. 30, 2024
Debt Instrument [Line Items]    
Letters of Credit Outstanding, Amount $ 234.2  
Forestar Group [Member]    
Debt Instrument [Line Items]    
Line of Credit Facility, Current Borrowing Capacity 640.0 $ 410.0
Line of Credit Facility, Maximum Borrowing Capacity 1,000.0  
Letter of Credit, Maximum Borrowing Capacity (in dollars) $ 100.0  
Letters of credit, sublimit borrowing capacity, as a percentage 50.00%  
Borrowings outstanding on revolving credit facility $ 0.0 $ 0.0
Letters of Credit Outstanding, Amount 22.3  
Line of Credit Facility, Remaining Borrowing Capacity 617.7  
Authorized Repurchase Of Debt Securities 30.0  
Debt Repurchase Authorization Remaining 30.0  
Forestar Group [Member] | 6.5% Senior Note de 2033    
Debt Instrument [Line Items]    
Debt Instrument, Issued, Principal $ 500.0  
Debt Instrument, Interest Rate, Stated Percentage 6.50%  
Debt Instrument, Interest Rate, Effective Percentage 6.70%  
Forestar Group [Member] | Senior Note Member Forty Six    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 3.85%  
Debt Instrument, Redemption Price $ 333.4  
Debt Instrument, Redemption, Accrued and Unpaid Interest 4.2  
Debt Instrument, Repurchased Face Amount 400.0  
Debt Instrument, Repurchase Amount 329.4  
Gain (Loss) on Repurchase of Debt Instrument 1.1  
Forestar Group [Member] | Credit Facility Maturing December 18, 2029    
Debt Instrument [Line Items]    
Line of Credit Facility, Current Borrowing Capacity $ 575.0  
Line of Credit Facility, Expiration Date Dec. 18, 2029  
Forestar Group [Member] | Credit Facility Maturing October 28, 2026    
Debt Instrument [Line Items]    
Line of Credit Facility, Current Borrowing Capacity $ 65.0  
Line of Credit Facility, Expiration Date Oct. 28, 2026