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, 2017
Jun. 30, 2016
Class of Stock [Line Items]    
Cash dividends paid on common stock $ 39.0 $ 38.3
Treasury Stock, Shares, Acquired 778,000  
Amount of shares repurchased $ 28.0 $ 16.6
Common stock, shares issued 755,000  
Treasury Stock    
Class of Stock [Line Items]    
Common stock, shares issued 665,000