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Inventory and Land Held for Sale (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Inventory and Land Held for Sale
Capitalized interest related to land and community valuation adjustments expensed	$ 1.3	$ 5.2	$ 1.3	$ 6.2
Homebuilding interest costs incurred and directly expensed		0.6		0.6
Number of communities assessed for impairment	22
Discount rate for fair value determination, aggregate average percentage	12.00%
Recognized net realizable value adjustments	(0.2)	(0.2)	(0.2)	0.4
Deposits and pre-acquisition costs write-off	$ 3.7	$ 2.3	$ 4.3	$ 2.9