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Earnings per share (Tables)
 3 Months Ended
Dec. 31, 2012
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, 2012 and 2011, respectively.

(in millions, except per share data)
Quarter Ended December 31,
 
2012
 
2011
Numerator:
 
 
 
Net earnings for basic and dilutive earnings per share
$
129.8

 
$
143.8

Denominator:
 
 
 
Weighted-average shares - basic
61.8

 
66.2

Effect of dilutive securities:
 
 
 
Stock options
0.1

 
0.2

Restricted stock equivalents
0.7

 
0.5

Total dilutive securities
0.8

 
0.7

Weighted-average shares - diluted
62.6

 
66.9

Basic net earnings per share
$
2.10

 
$
2.17

Diluted net earnings per share
$
2.07

 
$
2.15