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Earnings per share (Tables)
 3 Months Ended
Dec. 31, 2013
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
The following table sets forth the computation of basic and diluted earnings per share for the quarter ended December 31, 2013 and 2012, respectively.

(in millions, except per share data)
Quarter Ended December 31,
 
2013
 
2012
Numerator:
 
 
 
Net earnings for basic and dilutive earnings per share
$
107.9

 
$
129.8

Denominator:
 
 
 
Weighted-average shares - basic
62.5

 
61.8

Effect of dilutive securities:
 
 
 
Stock options
0.1

 
0.1

Restricted stock equivalents
0.5

 
0.7

Total dilutive securities
0.6

 
0.8

Weighted-average shares - diluted
63.1

 
62.6

Basic net earnings per share
$
1.73

 
$
2.10

Diluted net earnings per share
$
1.71

 
$
2.07