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Income Taxes (Notes)
9 Months Ended
Sep. 30, 2019
Income Tax Disclosure [Abstract]  
Income Taxes
9. Income Taxes

For interim reporting periods, the Company’s provision for income taxes is calculated using its annualized estimated effective tax rate for the year. This rate is based on its estimated full-year income and the related income tax expense for each jurisdiction in which the Company operates. The effective tax rate can be affected by changes in the geographical mix, permanent differences and the estimate of full-year pretax income. This rate is adjusted for the effects of discrete items occurring in the period.