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Earnings per share (Tables)
 9 Months Ended
Jun. 30, 2017
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
The following table sets forth the computation of basic and diluted earnings per share for the quarter and nine months ended June 30, 2017 and 2016, respectively.
(in millions, except per share data)
 
 
 
 
 
 
 
 
For the Quarter
Ended June 30,
 
For the Nine Months Ended June 30,
 
2017
 
2016
 
2017
 
2016
Net earnings
$
24.9

 
$
24.2

 
$
167.4

 
$
106.1

Basic average shares outstanding
61.8

 
61.8

 
61.8

 
61.9

Effect of dilutive restricted stock equivalents
0.5

 
0.7

 
0.5

 
0.5

Effect of dilutive performance shares
0.5

 
0.2

 
0.5

 
0.1

Diluted average shares outstanding
62.8

 
62.7

 
62.8

 
62.5

Basic earnings per common share
$
0.40

 
$
0.39

 
$
2.71

 
$
1.71

Diluted earnings per common share
$
0.40

 
$
0.39

 
$
2.67

 
$
1.70