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Earnings per Share (Tables)
 6 Months Ended
Mar. 31, 2017
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,
 
2017
 
2016
 
2017
 
2016
Basic average common shares outstanding
88.2

 
91.3

 
87.7

 
91.9

Impact of restricted shares, restricted share units and performance share units
1.1

 
1.2

 
1.2

 
1.6

Impact of convertible notes
2.7

 
—

 
1.3

 
—

Diluted average common shares outstanding
92.0


92.5


90.2


93.5