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Notes Payable - Homebuilding Textuals (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Sep. 30, 2024
Debt Instrument [Line Items]      
Letters of Credit Outstanding, Amount $ 234.2    
Home Building Consolidated      
Debt Instrument [Line Items]      
Line of Credit Facility, Current Borrowing Capacity 2,230.0   $ 2,190.0
Line of Credit Facility, Maximum Borrowing Capacity $ 3,000.0    
Letters of credit, sublimit borrowing capacity, as a percentage 100.00%    
Borrowings outstanding on revolving credit facility $ 0.0   $ 0.0
Letters of Credit Outstanding, Amount 211.9    
Line of Credit Facility, Remaining Borrowing Capacity 2,020.0    
Authorized Repurchase Of Debt Securities 500.0    
Debt Repurchase Authorization Remaining $ 500.0    
Home Building Consolidated | 2.5% Senior Notes due 2024 [Member]      
Debt Instrument [Line Items]      
Maturities of Senior Debt   $ 500.0  
Debt Instrument, Interest Rate, Stated Percentage 2.50%    
Home Building Consolidated | 5.5% Senior Note due 2035      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 5.50%    
Debt Instrument, Issued, Principal $ 700.0    
Debt Instrument, Maturity Date Oct. 15, 2035    
Debt Instrument, Interest Rate, Effective Percentage 5.60%    
Home Building Consolidated | Credit Facility Maturing December 18, 2029      
Debt Instrument [Line Items]      
Line of Credit Facility, Current Borrowing Capacity $ 1,965.0    
Line of Credit Facility, Expiration Date Dec. 18, 2029    
Home Building Consolidated | Credit Facility Maturing October 28, 2027      
Debt Instrument [Line Items]      
Line of Credit Facility, Current Borrowing Capacity $ 265.0    
Line of Credit Facility, Expiration Date Oct. 28, 2027