v3.26.1
Stockholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Mar. 31, 2026
Dec. 31, 2025
Mar. 31, 2025
Dec. 31, 2024
Mar. 31, 2026
Class of Stock [Line Items]            
Stock Repurchase Program, Authorized Amount   $ 5,000.0       $ 5,000.0
Treasury Stock, Shares, Acquired           10,400,000
Payments for Repurchase of Common Stock           $ 1,600.0
Stock Repurchase Program, Remaining Authorized Repurchase Amount   $ 1,700.0       1,700.0
Cash dividends paid per common share (in dollars per share)   $ 0.45 $ 0.45      
Divedends declared (in dollars per share)   $ 0.45 $ 0.45 $ 0.40 $ 0.40  
Cash dividends declared   $ (129.7) $ (131.5) $ (125.5) $ (128.5)  
Retained Earnings [Member]            
Class of Stock [Line Items]            
Cash dividends declared   (129.7) $ (131.5) $ (125.5) $ (128.5) (261.2)
Subsequent Event [Member]            
Class of Stock [Line Items]            
Divedends declared (in dollars per share) $ 0.45          
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