Revenue (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Revenue from External Customer [Line Items]
Residential lot sales	$ 346.9	$ 325.9	$ 594.2	$ 630.1
Deferred development lot sales	0.0	1.7	0.0	3.0
Tract sales and other	4.1	6.2	7.1	6.6
Revenues	$ 351.0	$ 333.8	$ 601.3	$ 639.7

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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