Consolidated Balance Sheets (Parenthetical) (Unaudited) - USD ($) $ in Millions	Dec. 31, 2018	Sep. 30, 2018
ASSETS
Valuation allowance for deferred income taxes	$ 17.1	$ 17.7
EQUITY
Preferred stock, par value (in dollars per share)	$ 0.1	$ 0.1
Preferred stock, shares authorized	30,000,000	30,000,000
Preferred stock, shares issued	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	1,000,000,000	1,000,000,000
Common stock, shares issued	389,200,668	388,120,243
Common stock, shares outstanding	373,242,060	376,261,635
Treasury stock, shares	15,958,608	11,858,608