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Stockholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2025
Apr. 01, 2025
Class of Stock [Line Items]              
Stock Repurchase Program, Authorized Amount   $ 4,000.0       $ 4,000.0  
Treasury Stock, Shares, Acquired           16,500,000  
Payments for Repurchase of Common Stock           $ 2,400.0  
Stock Repurchase Program, Remaining Authorized Repurchase Amount   $ 1,200.0       1,200.0  
Cash dividends paid per common share (in dollars per share)   $ 0.40 $ 0.40        
Divedends declared (in dollars per sh   $ 0.40 $ 0.40 $ 0.30 $ 0.30    
Cash dividends declared   $ (125.5) $ (128.5) $ (99.2) $ (99.9)    
Retained Earnings [Member]              
Class of Stock [Line Items]              
Cash dividends declared   (125.5) $ (128.5) $ (99.2) $ (99.9) (254.0)  
Subsequent Event [Member]              
Class of Stock [Line Items]              
Stock Repurchase Program, Authorized Amount             $ 5,000.0
Stock Repurchase Program, Remaining Authorized Repurchase Amount             $ 1,100.0
Divedends declared (in dollars per sh $ 0.40            
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   300.0       $ 300.0  
At-the-market Equity Offering Program, Common Stock Issued           0  
Common Stock Available for Issuance, Value Remaining   $ 750.0       $ 750.0