Consolidated Balance Sheets (Parenthetical) (Unaudited) (USD $) In Millions, except Share data, unless otherwise specified	Jun. 30, 2014	Sep. 30, 2013
Statement of Financial Position [Abstract]
Valuation allowance for deferred income taxes	$ 33.7	$ 31.0
Preferred stock, par value	$ 0.1	$ 0.1
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	371,613,825	330,143,689
Common stock, shares outstanding	364,413,754	322,943,618
Treasury stock, shares	7,200,071	7,200,071