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Earnings per share (Tables)
 12 Months Ended
Sep. 30, 2018
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 years ended September 30, 2018, 2017 and 2016:
 
For the Years Ended September 30,
(in millions, except per share data)
2018
 
2017
 
2016
Net earnings
$
93.5

 
$
201.5

 
$
127.7

Basic average shares outstanding
59.8

 
61.7

 
61.9

Effect of dilutive restricted stock equivalents
0.5

 
0.5

 
0.5

Effect of dilutive performance shares
0.9

 
0.4

 
0.1

Effect of stock based deferred compensation plan
0.2

 
—

 
—

Diluted average shares outstanding
61.4

 
62.6

 
62.5

Basic earnings per common share
$
1.56


$
3.27


$
2.06

Diluted earnings per common share
$
1.52


$
3.22


$
2.04