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Income Taxes
3 Months Ended
Mar. 31, 2015
Income Tax Disclosure [Abstract]  
Income Taxes
Income Taxes

The tax provision for interim periods is determined using the estimated annual effective consolidated tax rate, based on the current estimate of full-year earnings before taxes, adjusted for the impact of discrete quarterly items. For the three months ended March 31, 2015, our effective tax rate was 28.4%, compared with 27.6% for the same period in 2014. The increase in the effective tax rate primarily reflects changes in our geographic mix of earnings.