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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Sep. 30, 2017
Sep. 30, 2016
ASSETS    
Valuation allowance for deferred income taxes $ 11.2 $ 10.3
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 384,036,150 380,123,258
Common stock, shares outstanding 374,986,079 372,923,187
Treasury stock, shares 9,050,071 7,200,071