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Earnings per Common Share (Tables)
 9 Months Ended
Jun. 30, 2017
Earnings Per Share [Abstract]  
Calculated Earnings per Share
Earnings per share are calculated as follows (share information in thousands):
 
Quarter Ended June 30
 
Year to Date Ended June 30
 
2017
 
2016
 
2017
 
2016
Net income attributable to common shareholders
$
6.0

 
$
45.3

 
$
64.2

 
$
72.4

 
 
 
 
 
 
 
 
Average shares outstanding - Basic
65,795

 
65,406

 
65,567

 
65,300

Add potential effect of exercise of stock options
and other unvested equity awards
1,893

 
1,146

 
1,733

 
1,102

Average shares outstanding - Diluted
67,688

 
66,552

 
67,300

 
66,402

 
 
 
 
 
 
 
 
Net income attributable to common shareholders per common share - Basic
$
0.09

 
$
0.69

 
$
0.98

 
$
1.11

 
 
 
 

 
 

 
 

Net income attributable to common shareholders per common share - Diluted
$
0.09

 
$
0.68

 
$
0.95

 
$
1.09

 
 
 
 
 
 
 
 
Shares with anti-dilutive effect excluded from the computation of Diluted EPS
2

 
557

 
225

 
502