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EARNINGS PER COMMON SHARE
 12 Months Ended
Sep. 30, 2016
Earnings Per Share [Abstract]  
EARNINGS PER COMMON SHARE
NOTE 10. EARNINGS PER COMMON SHARE

Basic earnings per share is calculated based upon the weighted average number of outstanding common shares for the period, plus the effect of deferred vested shares. Diluted earnings per share is calculated consistent with the basic earnings per share calculation plus the effect of dilutive unissued common shares related to stock-based employee compensation programs. For all years presented, anti-dilutive stock options were excluded from the calculation of dilutive earnings per share. Excluded shares were 0.4 million, 0.2 million and 0.3 million for fiscal years 2016, 2015 and 2014, respectively. Cumulative treasury stock acquired, less cumulative shares reissued, have been excluded in determining the average number of shares outstanding.

Earnings per share is calculated as follows:
   
Years Ended September 30
  
 
  
2016
    
2015
    
2014
  
 
                  
Net income attributable to common shareholders
  
$
124.1
    
$
47.7
    
$
60.6
  
 
                        
Average shares outstanding - Basic (thousands)
    
65,333
      
57,249
      
57,555
  
Add potential effect of exercise of stock options
                        
and other unvested equity awards (thousands)
    
1,263
      
1,287
      
968
  
Average shares outstanding - Diluted (thousands)
    
66,596
      
58,536
      
58,523
  
 
                        
Net income attributable to common shareholders per common share - Basic
  
$
1.90
    
$
0.83
    
$
1.05
  
                         
Net income attributable to common shareholders per common share - Diluted
  
$
1.86
    
$
0.82
    
$
1.04