Income Taxes	3 Months Ended
Mar. 31, 2018
Income Taxes [Abstract]
Income Taxes	Income Taxes Our effective tax rate for the three months ended March 31, 2018, decreased period-over-period to 24.3% from 29.2%. The decrease was primarily attributable to the reduction of the U.S. federal statutory income tax rate to 21% from 35% resulting from the Tax Cuts and Jobs Act, or the Tax Act. In addition, income tax expense was reduced by approximately $13 million, primarily as a result of the successful resolution of foreign tax claims during the quarter. At March 31, 2018, our unrecognized tax benefits were $170.6 million. Of this amount, approximately $149.1 million would affect our effective tax rate upon resolution of the uncertain tax positions.

Income Taxes

3 Months Ended

Mar. 31, 2018

Our effective tax rate for the three months ended March 31, 2018, decreased period-over-period to 24.3% from 29.2%. The decrease was primarily attributable to the reduction of the U.S. federal statutory income tax rate to 21% from 35% resulting from the Tax Cuts and Jobs Act, or the Tax Act. In addition, income tax expense was reduced by approximately $13 million, primarily as a result of the successful resolution of foreign tax claims during the quarter.

At March 31, 2018, our unrecognized tax benefits were $170.6 million. Of this amount, approximately $149.1 million would affect our effective tax rate upon resolution of the uncertain tax positions.