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Share Repurchases (Tables)
6 Months Ended
Jul. 31, 2012
Share Repurchases [Abstract]  
Schedule Of Company's Share Repurchases
(Amounts in millions, except per share data)
 
Total Number of
Shares Repurchased
 
Average Price Paid per Share
 
Total Investment
Six months ended July 31, 2012
 
54.3
 
$63.17
 
$3,428.9
Six months ended July 31, 2011
 
65.4
 
$54.11
 
$3,540.0