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Income Taxes	3 Months Ended
Income Taxes	Mar. 31, 2019
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The provision for income taxes reflects an estimated annual tax rate of 27 percent in the first quarter of 2019, compared with 23 percent in the first quarter of 2018. The increase in the estimated annual tax rate is primarily due to changes in the geographic mix of profits.