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Earnings per Common Share (Tables)
 6 Months Ended
Mar. 31, 2017
Earnings Per Share [Abstract]  
Calculated Earnings per Share
Earnings per share are calculated as follows (share information in thousands):
 
Quarter Ended March 31
 
Year to Date Ended March 31
 
2017
 
2016
 
2017
 
2016
Net income attributable to common shareholders
$
34.4

 
$
22.3

 
$
58.2

 
$
27.1

 
 
 
 
 
 
 
 
Average shares outstanding - Basic
65,462

 
65,331

 
65,473

 
65,264

Add potential effect of exercise of stock options
and other unvested equity awards
1,670

 
1,051

 
1,584

 
1,100

Average shares outstanding - Diluted
67,132

 
66,382

 
67,057

 
66,364

 
 
 
 
 
 
 
 
Net income attributable to common shareholders per common share - Basic
$
0.52

 
$
0.34

 
$
0.89

 
$
0.41

 
 
 
 
 
 
 
 
Net income attributable to common shareholders per common share - Diluted
$
0.51

 
$
0.33

 
$
0.87

 
$
0.41

 
 
 
 
 
 
 
 
Shares with anti-dilutive effect excluded from the computation of Diluted EPS
348

 
625

 
500

 
568