Quarterly Results of Operations (Unaudited) (Details Textuals) (USD $) In Millions, unless otherwise specified	0 Months Ended	3 Months Ended										12 Months Ended
	Apr. 02, 2012	Sep. 30, 2013	Mar. 31, 2013	Sep. 30, 2014 Homebuilding [Member]	Jun. 30, 2014 Homebuilding [Member]	Mar. 31, 2014 Homebuilding [Member]	Dec. 31, 2013 Homebuilding [Member]	Sep. 30, 2013 Homebuilding [Member]	Jun. 30, 2013 Homebuilding [Member]	Mar. 31, 2013 Homebuilding [Member]	Dec. 31, 2012 Homebuilding [Member]	Sep. 30, 2014 Homebuilding [Member]	Sep. 30, 2013 Homebuilding [Member]	Sep. 30, 2012 Homebuilding [Member]
Inventory Impairments Information [Line Items]
Inventory impairments and land option charges				$ 21.3	$ 56.8	$ 4.4	$ 2.6	$ 27.1	$ 0.8	$ 1.8	$ 1.3	$ 85.2	$ 31.1	$ 6.2
Valuation Allowance, Deferred Tax Asset, Change in Amount	$ (753.2)	$ 2.9	$ (18.7)