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Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2020 | Mar. 31, 2019 | Sep. 30, 2018
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  | $ 1,000.0 |  |  |  |  |  |
Treasury Stock, Shares, Acquired |  |  |  |  |  |  |  | 7,000,000.0 |  |
Payments for Repurchase of Common Stock |  |  |  |  |  |  |  | $ 360.4 | $ 216.2 |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  | $ 535.3 |  |  |  |  |  | $ 535.3 |  |
Dividends, Common Stock [Abstract] |  |  |  |  |  |  |  |  |  |
Divedends declared (in dollars per sh |  | $ 0.175 | $ 0.175 | $ 0.15 | $ 0.15 | $ 0.15 | $ 0.15 |  |  |
Cash dividends paid per common share (in dollars per share) |  | $ 0.175 | $ 0.175 | $ 0.15 | $ 0.15 | $ 0.15 | $ 0.15 |  |  |
Common Stock, Shares, Issued |  | 394,279,177 |  | 392,172,821 |  |  |  | 394,279,177 |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Dividends, Common Stock [Abstract] |  |  |  |  |  |  |  |  |  |
Divedends declared (in dollars per sh | $ 0.175 |  |  |  |  |  |  |  |  |
Forestar Group [Member] |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Equity Securities Registered, Value |  |  |  |  |  |  |  |  |  | $ 500.0
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 |  | $ 394.3 |  |  |  |  |  | $ 394.3 |  |

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