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INCOME TAXES: (Tables)
3 Months Ended
Mar. 31, 2012
INCOME TAXES:  
Schedule of income tax provision and effective income tax rate

 

 

 

 

2012

 

2011

 

Income tax provision

 

$

318.8

 

$

238.1

 

Effective income tax rate

 

33.9

%

33.1

%