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INCOME TAXES: (Tables)
6 Months Ended
Jun. 30, 2012
INCOME TAXES:  
Schedule of income tax provision and effective income tax rate

 

 

 

 

2012

 

2011

 

 

 

 

 

 

 

Income tax provision

 

$

628.7

 

$

540.0

 

Effective income tax rate

 

35.1

%

32.1

%