Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data	Sep. 30, 2011	Sep. 30, 2010
ASSETS
Valuation allowance for deferred income taxes	$ 848.5	$ 902.6
EQUITY
Preferred stock, par value	$ 0.10	$ 0.10
Preferred stock, shares authorized	30,000,000	30,000,000
Preferred stock, shares issued
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	1,000,000,000	1,000,000,000
Common stock, shares issued	323,243,170	322,478,467
Common stock, shares outstanding	316,043,099	318,823,234
Treasury stock, shares	7,200,071	3,655,233
Homebuilding [Member]
ASSETS
Valuation allowance for deferred income taxes	$ 848.5	$ 902.6