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Earnings Per Share (Narrative) (Details) - shares
shares in Millions
3 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive share-based awards excluded from computation of diluted earnings per share (in shares) 0.0 0.1