Earnings per Share (Narrative) (Details)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Earnings Per Share        
Antidilutive options excluded from computation of diluted earnings per share 0.2 0.8 0.3 0.8