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Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 30, 2023 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2024 | Jul. 01, 2024 | Nov. 30, 2021
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  | $ 1,500.0 |  |  |  |  |  | $ 1,500.0 |  |
Treasury Stock, Shares, Acquired |  |  |  |  |  |  |  |  | 9,000,000.0 |  |
Payments for Repurchase of Common Stock | $ 201.6 |  |  |  |  |  |  |  | $ 1,200.0 |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  |  | $ 459.7 |  |  |  |  |  | 459.7 |  |
Cash dividends paid per common share (in dollars per share) |  |  | $ 0.30 | $ 0.30 | $ 0.30 |  |  |  |  |  |
Divedends declared (in dollars per sh |  |  | $ 0.30 | $ 0.30 | $ 0.30 |  |  |  |  |  |
Cash dividends declared |  |  | $ (98.5) | $ (99.2) | $ (99.9) | $ (85.2) | $ (85.6) | $ (86.1) |  |  |
Retained Earnings [Member] |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared |  |  | (98.5) | $ (99.2) | $ (99.9) | $ (85.2) | $ (85.6) | $ (86.1) | (297.5) |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  |  |  | $ 4,000.0 |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  |  |  |  |  |  |  |  |  | $ 261.9 |
Divedends declared (in dollars per sh |  | $ 0.30 |  |  |  |  |  |  |  |  |
Forestar Group [Member] |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity Securities Registered, Value |  |  | 750.0 |  |  |  |  |  | 750.0 |  |
At-the-market Equity Offering Program, Common Stock Available for Issuance |  |  | 278.1 |  |  |  |  |  | $ 278.1 |  | $ 300.0
At-the-market Equity Offering Program, Common Stock Issued |  |  |  |  |  |  |  |  | 546,174 |  |
Stock Issued During Period, Value, New Issues |  |  |  |  |  |  |  |  | $ 19.7 |  |
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs |  |  |  |  |  |  |  |  | 0.4 |  |
Common Stock Available for Issuance, Value Remaining |  |  | $ 728.1 |  |  |  |  |  | $ 728.1 |  |

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