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Notes Payable - Forestar Textuals (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Oct. 01, 2025
Sep. 30, 2025
Mar. 31, 2025
Sep. 30, 2025
Oct. 31, 2025
Dec. 31, 2024
Sep. 30, 2024
Debt Instrument [Line Items]              
Letters of credit, amount outstanding   $ 282.3   $ 282.3      
Forestar Group [Member]              
Debt Instrument [Line Items]              
Line of credit, current borrowing capacity   640.0   640.0   $ 410.0  
Line of credit, maximum borrowing capacity   1,000.0   1,000.0      
Letter of Credit, Maximum Borrowing Capacity (in dollars)   $ 100.0   $ 100.0      
Letter of Credit, Maximum Borrowing Capacity   50.00%   50.00%      
Line of credit, amount outstanding   $ 0.0   $ 0.0     $ 0.0
Letters of credit, amount outstanding   51.1   51.1      
Line of Credit Facility, Remaining Borrowing Capacity   588.9   588.9      
Authorized Repurchase Of Debt Securities   30.0   30.0      
Debt Repurchase Authorization Remaining   30.0   30.0      
Forestar Group [Member] | Subsequent Event [Member]              
Debt Instrument [Line Items]              
Line of credit, current borrowing capacity         $ 665.0    
Forestar Group [Member] | Credit Facility Maturing December 18, 2029              
Debt Instrument [Line Items]              
Line of credit, current borrowing capacity   575.0   $ 575.0      
Line of Credit Facility, Expiration Date       Dec. 18, 2029      
Forestar Group [Member] | Credit Facility Maturing December 18, 2029 | Subsequent Event [Member]              
Debt Instrument [Line Items]              
Line of Credit Facility, Increase (Decrease), Net $ 25.0            
Forestar Group [Member] | Credit Facility Maturing October 28, 2026              
Debt Instrument [Line Items]              
Line of credit, current borrowing capacity   65.0   $ 65.0      
Line of Credit Facility, Expiration Date       Oct. 28, 2026      
Forestar Group [Member] | 5.0% Senior Notes due 2028 [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Face Amount   $ 300.0   $ 300.0      
Senior notes, stated interest rate   5.00%   5.00%      
Debt Instrument, Interest Rate, Effective Percentage   5.20%   5.20%      
Debt Instrument, Maturity Date       Mar. 01, 2028      
Debt Instrument, Call Feature       Yes      
Forestar Group [Member] | 6.5% Senior Notes due 2033              
Debt Instrument [Line Items]              
Debt Instrument, Face Amount   $ 500.0   $ 500.0      
Senior notes, stated interest rate   6.50%   6.50%      
Debt Instrument, Interest Rate, Effective Percentage   6.70%   6.70%      
Debt Instrument, Maturity Date       Mar. 15, 2033      
Debt Instrument, Call Feature       Yes      
Forestar Group [Member] | 3.85% Senior Notes due 2026              
Debt Instrument [Line Items]              
Senior notes, stated interest rate   3.85%   3.85%      
Debt Instrument, Repurchased Face Amount     $ 400.0        
Debt Instrument, Repurchase Amount     329.4        
Debt Instrument, Total Repurchase Price     333.4        
Debt Instrument, Repurchase, Accrued and Unpaid Interest     $ 4.2        
Debt Redemption, Principal Amount Redeemed   $ 70.6          
Debt Redemption, Total Amount   71.6          
Debt Redemption, Amount of Unpaid Interest Paid   1.0          
Gain (Loss) on Repurchase of Debt Instrument       $ 1.2      
Forestar Group [Member] | Senior Notes [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Face Amount   $ 800.0   $ 800.0