Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity - Narrative (Details)

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Shareholders' Equity - Narrative (Details) - USD ($)
$ in Millions
9 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Class of Stock [Line Items]    
Cash dividends paid on common stock $ 39.1 $ 39.0
Treasury Stock, Shares, Acquired 1,377,000  
Amount of shares repurchased $ 60.6 $ 28.0
Common stock, shares issued 584,000  
Treasury Stock    
Class of Stock [Line Items]    
Common stock, shares issued 448,000