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Stockholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended
Oct. 30, 2023
Mar. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Oct. 31, 2023
Oct. 31, 2021
Class of Stock [Line Items]            
Stock Repurchase Program, Authorized Amount         $ 1,500.0  
Treasury Stock, Shares, Acquired     3,300,000      
Payments for Repurchase of Common Stock $ 201.6   $ 398.3      
Stock Repurchase Program, Remaining Authorized Repurchase Amount     $ 1,300.0      
Divedends declared (in dollars per sh     $ 0.30      
Cash dividends paid per common share (in dollars per share)     $ 0.30      
Cash dividends declared     $ (99.9) $ (86.1)    
Subsequent Event [Member]            
Class of Stock [Line Items]            
Divedends declared (in dollars per sh   $ 0.30        
Forestar Group [Member]            
Class of Stock [Line Items]            
Equity Securities Registered, Value     750.0      
At-the-market Equity Offering Program, Common Stock Available for Issuance     298.2     $ 300.0
Common Stock Available for Issuance, Value Remaining     $ 748.2      
At-the-market Equity Offering Program, Common Stock Issued     0