Income Taxes	9 Months Ended
Sep. 30, 2018
Income Taxes [Abstract]
Income Taxes	Income Taxes Our effective tax rate for the nine months ended September 30, 2018, decreased period-over-period to 25.4% from 31.1%. The decrease was primarily attributable to the reduction in the U.S. federal statutory rate, resulting from the Tax Cuts and Jobs Act, or Tax Act, enacted in December 2017. Additionally, income tax expense reflects a reduction of approximately $19 million, primarily as a result of the successful resolution of foreign tax claims, a reduction of $25.0 million related to the net income tax effect of the net gain on disposition of subsidiaries and repositioning actions (see Note 10), and additional income tax expense of $28.9 million in connection with a revision to the provisional estimate of the effect of the Tax Act, as described below. In addition to reducing the U.S. federal statutory rate, the Tax Act made several changes to existing tax law which affected our tax assets and liabilities related to previously reported taxable income. As a result, in 2017, we recorded tax expense on accumulated earnings of our foreign subsidiaries and adjusted our previously reported deferred tax assets and liabilities to reflect the impact of the revised statutory federal rate as of the enactment date. In December 2017, the SEC issued Staff Accounting Bulletin 118, or SAB 118, which provided guidance on accounting for the impact of the Tax Act. SAB 118 provided that provisional amounts should be recognized in our financial statements where the accounting for certain effects of the Tax Act is not complete and a reasonable estimate of the effects of the Tax Act can be made. Income tax expense for the fourth quarter of 2017 reflected a net increase of $106.3 million related to the impact of the Tax Act. During the third quarter of 2018, we updated certain provisional amounts in consideration of recent guidance and additional information regarding the tax on our accumulated foreign earnings. which resulted in additional income tax expense of $28.9 million. We are still finalizing certain provisional amounts. At September 30, 2018, our unrecognized tax benefits were $153.2 million. Of this amount, approximately $140.2 million would affect our effective tax rate upon resolution of the uncertain tax positions.

Income Taxes

Our effective tax rate for the nine months ended September 30, 2018, decreased period-over-period to 25.4% from 31.1%. The decrease was primarily attributable to the reduction in the U.S. federal statutory rate, resulting from the Tax Cuts and Jobs Act, or Tax Act, enacted in December 2017. Additionally, income tax expense reflects a reduction of approximately $19 million, primarily as a result of the successful resolution of foreign tax claims, a reduction of $25.0 million related to the net income tax effect of the net gain on disposition of subsidiaries and repositioning actions (see Note 10), and additional income tax expense of $28.9 million in connection with a revision to the provisional estimate of the effect of the Tax Act, as described below.

In addition to reducing the U.S. federal statutory rate, the Tax Act made several changes to existing tax law which affected our tax assets and liabilities related to previously reported taxable income. As a result, in 2017, we recorded tax expense on accumulated earnings of our foreign subsidiaries and adjusted our previously reported deferred tax assets and liabilities to reflect the impact of the revised statutory federal rate as of the enactment date. In December 2017, the SEC issued Staff Accounting Bulletin 118, or SAB 118, which provided guidance on accounting for the impact of the Tax Act. SAB 118 provided that provisional amounts should be recognized in our financial statements where the accounting for certain effects of the Tax Act is not complete and a reasonable estimate of the effects of the Tax Act can be made. Income tax expense for the fourth quarter of 2017 reflected a net increase of $106.3 million related to the impact of the Tax Act. During the third quarter of 2018, we updated certain provisional amounts in consideration of recent guidance and additional information regarding the tax on our accumulated foreign earnings. which resulted in additional income tax expense of $28.9 million. We are still finalizing certain provisional amounts.

At September 30, 2018, our unrecognized tax benefits were $153.2 million. Of this amount, approximately $140.2 million would affect our effective tax rate upon resolution of the uncertain tax positions.