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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 |  |  |  |  |  |  |

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