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Earnings per Share (Tables)
 9 Months Ended
Jun. 30, 2015
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
June 30,
 
Nine Months Ended June 30,
 
2015
 
2014
 
2015
 
2014
Basic average common shares outstanding
96.9

 
97.6

 
97.6

 
97.5

Impact of stock options
0.1

 
0.1

 
0.1

 
0.1

Impact of restricted shares, restricted share units and performance share units
1.8

 
1.6

 
2.0

 
1.5

Impact of convertible notes
1.5

 
1.8

 
1.3

 
—

Diluted average common shares outstanding
100.3

 
101.1

 
101.0

 
99.1