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Stockholders' Equity (Details) - USD ($)
$ / shares in Units, shares in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Jun. 30, 2019
Jun. 30, 2018
Jul. 30, 2019
Aug. 01, 2018
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]                        
Amount of stock repurchase authorization                       $ 400,000,000
Document Period End Date                 Jun. 30, 2019      
Treasury Stock, Shares, Acquired                 9.8      
Payments for Repurchase of Common Stock                 $ 361,500,000 $ 74,900,000    
Amount remaining under stock repurchase authorization         $ 375,500,000              
Dividends, Common Stock [Abstract]                        
Cash dividends declared per common share (in dollars per share)   $ 0.15 $ 0.15 $ 0.15 $ 0.125 $ 0.125 $ 0.125 $ 0.125        
Cash dividends paid per common share (in dollars per share)   $ 0.15 $ 0.15 $ 0.15 $ 0.125 $ 0.125 $ 0.125 $ 0.125        
Subsequent Event [Member]                        
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]                        
Amount of stock repurchase authorization                     $ 1,000,000,000.0  
Dividends, Common Stock [Abstract]                        
Cash dividends declared per common share (in dollars per share) $ 0.15                      
Forestar Group [Member]                        
Class of Stock [Line Items]                        
Equity Securities Registered, Value         $ 500,000,000