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Income Taxes
6 Months Ended
Jun. 30, 2014
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]  
Income Taxes
Income Taxes
 
Excluding the impact of a $991.5 million loss on impairment and all other discrete income tax expense, our consolidated effective income tax rate for the three-month and six-month periods ended June 30, 2014 was 10.9% as compared to 11.9% for the three-month and six-month periods ended June 30, 2013. The decrease is primarily attributable to an increase in the relative components of our estimated 2014 earnings, excluding discrete items, generated in tax jurisdictions with lower tax rates.
    
Discrete income tax expense for the three-month period ended June 30, 2014 was primarily attributable to the resolution of prior period tax matters. Discrete income tax expense for the six-month period ended June 30, 2014 was primarily attributable to the recognition of a liability for unrecognized tax benefits associated with certain tax positions taken in prior years and the resolution of prior period tax matters. Discrete income tax expense for the six-month period ended June 30, 2013 was primarily attributable to the recognition of a liability for unrecognized tax benefits associated with a tax position taken in prior years.