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Stockholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
Oct. 30, 2023
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Jun. 30, 2024
Jul. 01, 2024
Nov. 30, 2021
Class of Stock [Line Items]                      
Stock Repurchase Program, Authorized Amount     $ 1,500.0           $ 1,500.0    
Treasury Stock, Shares, Acquired                 9,000,000.0    
Payments for Repurchase of Common Stock $ 201.6               $ 1,200.0    
Stock Repurchase Program, Remaining Authorized Repurchase Amount     $ 459.7           459.7    
Cash dividends paid per common share (in dollars per share)     $ 0.30 $ 0.30 $ 0.30            
Divedends declared (in dollars per sh     $ 0.30 $ 0.30 $ 0.30            
Cash dividends declared     $ (98.5) $ (99.2) $ (99.9) $ (85.2) $ (85.6) $ (86.1)      
Retained Earnings [Member]                      
Class of Stock [Line Items]                      
Cash dividends declared     (98.5) $ (99.2) $ (99.9) $ (85.2) $ (85.6) $ (86.1) (297.5)    
Subsequent Event [Member]                      
Class of Stock [Line Items]                      
Stock Repurchase Program, Authorized Amount                   $ 4,000.0  
Stock Repurchase Program, Remaining Authorized Repurchase Amount                   $ 261.9  
Divedends declared (in dollars per sh   $ 0.30                  
Forestar Group [Member]                      
Class of Stock [Line Items]                      
Equity Securities Registered, Value     750.0           750.0    
At-the-market Equity Offering Program, Common Stock Available for Issuance     278.1           $ 278.1   $ 300.0
At-the-market Equity Offering Program, Common Stock Issued                 546,174    
Stock Issued During Period, Value, New Issues                 $ 19.7    
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs                 0.4    
Common Stock Available for Issuance, Value Remaining     $ 728.1           $ 728.1