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Earnings per Share Earnings per Share (Tables)
 6 Months Ended
Mar. 31, 2014
Earnings Per Share [Abstract]  
Reconciliation of basic average common shares outstanding
A reconciliation of basic average common shares outstanding to diluted average common shares outstanding is as follows (in millions):
 
Three Months Ended
March 31,
 
Six Months Ended March 31,
 
2014
 
2013
 
2014
 
2013
Basic average common shares outstanding
97.6

 
97.2

 
97.5

 
96.9

Impact of stock options
—

 
—

 
—

 
—

Impact of restricted and performance shares
—

 
—

 
1.7

 
—

Diluted average common shares outstanding
97.6

 
97.2

 
99.2

 
96.9