Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2018	Sep. 30, 2017
ASSETS
Valuation allowance for deferred income taxes	$ 17.7	$ 11.2
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	388,120,243	384,036,150
Common stock, shares outstanding	376,261,635	374,986,079
Treasury stock, shares	11,858,608	9,050,071