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Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2022 | Apr. 30, 2022 | Oct. 31, 2021
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  |  |  | $ 1,000.0 |
Treasury Stock, Shares, Acquired |  | 4,700,000 |  |  |  |  |  |  | 10,500,000 |  |
Payments for Repurchase of Common Stock |  | $ 310.0 |  |  |  |  |  |  | $ 854.2 |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  | $ 690.0 |  |  |  |  |  |  | 690.0 |  |
Divedends declared (in dollars per sh |  | $ 0.225 | $ 0.225 | $ 0.225 | $ 0.20 | $ 0.20 | $ 0.20 | $ 0.20 |  |  |
Cash dividends paid per common share (in dollars per share) |  | $ 0.225 | $ 0.225 | $ 0.225 | $ 0.20 | $ 0.20 | $ 0.20 | $ 0.20 |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Divedends declared (in dollars per sh | $ 0.225 |  |  |  |  |  |  |  |  |  |
Forestar Group [Member] |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity Securities Registered, Value |  |  |  |  |  |  |  |  |  |  | $ 750.0
At-the-market Equity Offering Program, Common Stock Available for Issuance |  | $ 298.2 |  |  |  |  |  |  | $ 298.2 |  | $ 300.0
At-the-market Equity Offering Program, Common Stock Issued |  |  |  |  |  |  |  |  | 84,547 |  |
Stock Issued During Period, Value, New Issues |  |  |  |  |  |  |  |  | $ 1.7 |  |
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs |  |  |  |  |  |  |  |  | 0.1 |  |
Common Stock Available for Issuance, Value Remaining |  | $ 748.2 |  |  |  |  |  |  | $ 748.2 |  |

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