Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
ASSETS
Valuation allowance for deferred income taxes	$ 31.0	$ 41.9
EQUITY
Preferred stock, par value	$ 0.10	$ 0.10
Preferred stock, shares authorized	30,000,000	30,000,000
Preferred stock, shares issued	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	1,000,000,000	1,000,000,000
Common stock, shares issued	330,143,689	328,092,047
Common stock, shares outstanding	322,943,618	320,891,976
Treasury stock, shares	7,200,071	7,200,071