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Earnings per Share (Tables)
 9 Months Ended
Jun. 30, 2018
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,
 
2018
 
2017
 
2018
 
2017
Basic average common shares outstanding
87.2

 
88.4

 
88.1

 
87.9

Impact of restricted shares, restricted share units and performance share units
1.7

 
1.8

 
2.1

 
1.4

Impact of convertible notes
0.9

 
3.1

 
1.0

 
2.1

Diluted average common shares outstanding
89.8


93.3


91.2


91.4