Income Taxes	9 Months Ended
Sep. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes: The effective income tax rate for the three-month and nine-month periods ended September 30, 2018 was 21.5% and 20.1%, respectively, compared to 14.3% and 17.6% for the three-month and nine-month periods ended September 30, 2017, respectively. The Company’s effective income tax rate fluctuates based on, among other factors, its level and location of income. The difference between the U.S. federal statutory income tax rate of 21% and our effective income tax rate for the three-month and nine-month periods ended September 30, 2018 was impacted by a variety of factors, primarily stemming from the location in which income was earned. Income tax expense for the three-month period ended September 30, 2018 includes discrete tax expenses of $1.9 million from stock-based compensation arrangements and $1.7 million related to the accounting for the U.S. Tax Cuts and Jobs Act (“TCJA”) as noted below, partially offset by discrete tax benefits of $2.0 million from foreign accrual to return adjustments and $1.2 million from the release of foreign valuation allowances. Income tax expense for the nine-month period ended September 30, 2018 includes discrete tax expenses of $42.0 million for the Polyolefin Catalysts Divestiture as described in Note 2, “Divestitures,” and $7.3 million for adjustments to foreign valuation allowances, partially offset by discrete tax benefits of $8.0 million for tax accounting method changes, $4.8 million for adjustments related to the accounting for the TCJA as noted below, $5.4 million from stock-based compensation arrangements and $2.0 million from foreign accrual to return adjustments. The difference between the U.S. federal statutory income tax rate of 35% and our effective income tax rate for the three-month and nine-month periods ended September 30, 2017 was primarily due to the impact of earnings from outside the U.S., and is mainly attributable to our share of the income of our Jordan Bromine Company Limited (“JBC”) joint venture, a Free Zones company under the laws of the Hashemite Kingdom of Jordan. Income tax expense for the nine-month period ended September 30, 2017 included discrete tax expenses from foreign rate changes of $14.8 million and a $5.1 million out-of-period adjustment due to changes in our deferred tax liabilities for basis differences in Chilean fixed assets, partially offset by discrete tax benefits of $10.8 million from the release of valuation allowances due to a foreign restructuring plan that was initiated during the second quarter of 2017 and $6.9 million from stock-based compensation arrangements. In connection with the TCJA, we recorded a provisional amount of income tax expense of $429.2 million related to the one-time transition tax and income tax benefit of $62.3 million related to the remeasurement of deferred tax balances for the year ended December 31, 2017. In accordance with SEC Staff Accounting Bulletin (“SAB”) 118, the effects of the TCJA may be adjusted within a one-year measurement period from the enactment date for the items that were previously reported as provisional, or where a provisional estimate could not be made. The income tax provision for the nine-month period ended September 30, 2018 reflects a discrete tax benefit of $2.8 million related to an adjustment of our estimate of the one-time transition tax and a discrete tax benefit of $2.0 million related to other provisions of the TCJA. In addition, the effective income tax rate for the three-month and nine-month periods ended September 30, 2018, includes a $1.1 million and $7.2 million, respectively, net tax expense, primarily related to global intangible low-taxed income enacted by the TCJA. For the global intangible low-taxed income provisions of the TCJA, we have not yet elected an accounting policy with respect to either recognizing deferred taxes for basis differences expected to impact global intangible low-taxed income, or to record such as period costs if and when incurred. We also continue to evaluate our indefinite reinvestment assertion as a result of the TCJA. We will continue to assess forthcoming guidance and accounting interpretations on the effects of the TCJA and expect to finalize our analysis within the measurement period in accordance with the SEC guidance. During the nine months ended September 30, 2018, the Company's uncertain tax positions did not materially change, however, it is reasonably possible the positions could increase within the next 12 months due to ongoing tax audits in Germany.

Income Taxes:

The effective income tax rate for the three-month and nine-month periods ended September 30, 2018 was 21.5% and 20.1%, respectively, compared to 14.3% and 17.6% for the three-month and nine-month periods ended September 30, 2017, respectively. The Company’s effective income tax rate fluctuates based on, among other factors, its level and location of income. The difference between the U.S. federal statutory income tax rate of 21% and our effective income tax rate for the three-month and nine-month periods ended September 30, 2018 was impacted by a variety of factors, primarily stemming from the location in which income was earned. Income tax expense for the three-month period ended September 30, 2018 includes discrete tax expenses of $1.9 million from stock-based compensation arrangements and $1.7 million related to the accounting for the U.S. Tax Cuts and Jobs Act (“TCJA”) as noted below, partially offset by discrete tax benefits of $2.0 million from foreign accrual to return adjustments and $1.2 million from the release of foreign valuation allowances. Income tax expense for the nine-month period ended September 30, 2018 includes discrete tax expenses of $42.0 million for the Polyolefin Catalysts Divestiture as described in Note 2, “Divestitures,” and $7.3 million for adjustments to foreign valuation allowances, partially offset by discrete tax benefits of $8.0 million for tax accounting method changes, $4.8 million for adjustments related to the accounting for the TCJA as noted below, $5.4 million from stock-based compensation arrangements and $2.0 million from foreign accrual to return adjustments.

The difference between the U.S. federal statutory income tax rate of 35% and our effective income tax rate for the three-month and nine-month periods ended September 30, 2017 was primarily due to the impact of earnings from outside the U.S., and is mainly attributable to our share of the income of our Jordan Bromine Company Limited (“JBC”) joint venture, a Free Zones company under the laws of the Hashemite Kingdom of Jordan. Income tax expense for the nine-month period ended September 30, 2017 included discrete tax expenses from foreign rate changes of $14.8 million and a $5.1 million out-of-period adjustment due to changes in our deferred tax liabilities for basis differences in Chilean fixed assets, partially offset by discrete tax benefits of $10.8 million from the release of valuation allowances due to a foreign restructuring plan that was initiated during the second quarter of 2017 and $6.9 million from stock-based compensation arrangements.

In connection with the TCJA, we recorded a provisional amount of income tax expense of $429.2 million related to the one-time transition tax and income tax benefit of $62.3 million related to the remeasurement of deferred tax balances for the year ended December 31, 2017. In accordance with SEC Staff Accounting Bulletin (“SAB”) 118, the effects of the TCJA may be adjusted within a one-year measurement period from the enactment date for the items that were previously reported as provisional, or where a provisional estimate could not be made. The income tax provision for the nine-month period ended September 30, 2018 reflects a discrete tax benefit of $2.8 million related to an adjustment of our estimate of the one-time transition tax and a discrete tax benefit of $2.0 million related to other provisions of the TCJA. In addition, the effective income tax rate for the three-month and nine-month periods ended September 30, 2018, includes a $1.1 million and $7.2 million, respectively, net tax expense, primarily related to global intangible low-taxed income enacted by the TCJA. For the global intangible low-taxed income provisions of the TCJA, we have not yet elected an accounting policy with respect to either recognizing deferred taxes for basis differences expected to impact global intangible low-taxed income, or to record such as period costs if and when incurred. We also continue to evaluate our indefinite reinvestment assertion as a result of the TCJA. We will continue to assess forthcoming guidance and accounting interpretations on the effects of the TCJA and expect to finalize our analysis within the measurement period in accordance with the SEC guidance.

During the nine months ended September 30, 2018, the Company's uncertain tax positions did not materially change, however, it is reasonably possible the positions could increase within the next 12 months due to ongoing tax audits in Germany.