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Stockholders' Equity (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |  |  |
Amount of stock repurchase authorization |  |  | $ 1,000,000,000.0 |  |  |  |
Treasury Stock, Shares, Acquired |  | 3,000,000.0 |  |  |  |  |
Payments for Repurchase of Common Stock |  | $ 163,100,000 |  |  |  | $ 140,600,000 |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  | $ 732,600,000 |  |  |  |  |
Dividends, Common Stock [Abstract] |  |  |  |  |  |  |
Cash dividends declared per common share (in dollars per share) |  | $ 0.175 | $ 0.15 | $ 0.15 | $ 0.15 | $ 0.15 |
Cash dividends paid per common share (in dollars per share) |  | $ 0.175 | $ 0.15 | $ 0.15 | $ 0.15 | $ 0.15 |
Common Stock, Shares, Issued |  | 393,014,557 | 392,172,821 |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |
Dividends, Common Stock [Abstract] |  |  |  |  |  |  |
Cash dividends declared per common share (in dollars per share) | $ 0.175 |  |  |  |  |  |
Forestar Group [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Equity Securities Registered, Value |  |  |  |  |  |  | $ 500,000,000
Dividends, Common Stock [Abstract] |  |  |  |  |  |  |
Common Stock, Shares, Issued |  |  | 6,000,000.0 |  |  |  |
Shares Issued, Price Per Share |  |  | $ 17.50 |  |  |  |
Common Stock Available for Issuance, Value Remaining |  | $ 394,300,000 |  |  |  |  |

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