Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2019	Sep. 30, 2018
ASSETS
Valuation allowance for deferred income taxes	$ 18.7	$ 17.7
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	392,172,821	388,120,243
Common stock, shares outstanding	368,431,454	376,261,635
Treasury stock, shares	23,741,367	11,858,608