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v3.20.1

Related Party Transactions (Details) $ in Millions | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 31, 2019 USD ($) | Mar. 31, 2019 USD ($) a | Mar. 31, 2020 USD ($) | Sep. 30, 2019 USD ($)
Related Party Transaction [Line Items] |  |  |  |
Inventory, Real Estate, Land and Land Development Costs |  |  | $ 6,151.9 | $ 5,939.4
Immediate Family Member of Management or Principal Owner [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related Party Transaction, Due from (to) Related Party |  | $ 77.5 |  |
Area of Land | a |  | 119 |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Interest Rate |  | 2.55% |  |
Inventory, Real Estate, Land and Land Development Costs |  |  |  | 77.5
Payments to Acquire Land | $ 84.2 |  |  |
Land under Purchase Options, Recorded |  | $ 77.5 |  |
Related Party Transaction, Rate |  | 16.00% |  |
Forestar Group [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Inventory, Real Estate, Land and Land Development Costs |  |  | $ 1,171.0 | $ 1,011.8

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