Basis of Presentation (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2014	Sep. 30, 2013	Sep. 30, 2014
Homebuilding [Member]
Business Information [Line Items]
Earnest Money Deposits	$ 64.2
Homebuilding [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Business Information [Line Items]
Earnest Money Deposits	60.3		55.7
Cash and Cash Equivalents [Member]
Business Information [Line Items]
Prior Period Reclassification Adjustment	$ 40.7	$ 40.9