Commitments and Contingencies (Details) (Homebuilding [Member], USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Homebuilding [Member]
Changes in warranty liability
Warranty liability, beginning of period	$ 57.3	$ 57.3	$ 56.9	$ 56.8
Warranties issued	9.2	7.2	23.9	18.8
Changes in liability for pre-existing warranties	3.3	0.7	5.4	5.9
Settlements made	(8.5)	(8.0)	(24.9)	(24.3)
Warranty liability, end of period	$ 61.3	$ 57.2	$ 61.3	$ 57.2