Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity - Narrative (Details)

v3.8.0.1
Shareholders' Equity - Narrative (Details) - USD ($)
$ in Millions
6 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Class of Stock [Line Items]    
Cash dividends paid on common stock $ 26.2 $ 26.0
Treasury Stock, Shares, Acquired 906,000  
Amount of shares repurchased $ 38.9 $ 17.0
Common stock, shares issued 548,000  
Treasury Stock    
Class of Stock [Line Items]    
Common stock, shares issued 412,000