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INCOME TAXES: (Tables)
3 Months Ended
Mar. 31, 2013
INCOME TAXES:  
Schedule of income tax provision and effective income tax rate

The income tax provision and the effective income tax rate for the first quarter 2013 and 2012 were as follows ($ in millions):

 

 

 

2013

 

2012

 

Income tax provision

 

$

234.9

 

$

318.8

 

Effective income tax rate

 

32.5

%

33.9

%