Income Taxes	9 Months Ended
Sep. 30, 2021
Income Tax Disclosure [Abstract]
Income Taxes	13. Income Taxes Our effective income tax rate fluctuates from the U.S. statutory tax rate based on, among other factors, changes in pretax income in jurisdictions with varying statutory tax rates, the impact of U.S. state and local taxes, the realizability of deferred tax assets and other differences related to the recognition of income and expense between U.S. GAAP and tax accounting. Our effective income tax rate for the three months ended September 30, 2021 was 17.5%, compared with 10.4% for the three months ended September 30, 2020. The higher effective income tax rate for the three months ended September 30, 2021 was primarily attributable to the non-deductible portion of the goodwill impairment included in the 2020 estimated annual effective tax rate. This was partially offset by the valuation allowance included in the 2021 estimated annual effective tax rate. Our effective income tax rate for the nine months ended September 30, 2021 was 15.7%, compared with 12.8% for the nine months ended September 30, 2020. The higher effective income tax rate for the nine months ended September 30, 2021 was primarily attributable to the non-deductible portion of the goodwill impairment included in the 2020 estimated annual effective tax rate. This was partially offset by the valuation allowance included in the 2021 estimated annual effective tax rate, and also state rate changes enacted during 2021. In assessing the realizability of deferred tax assets, management considers whether it is more likely than not that some portion or all of the deferred tax assets will not be realized, and when necessary valuation allowances are provided. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. We assess the realizability of our deferred tax assets quarterly and consider carryback availability, the scheduled reversal of deferred tax liabilities, projected future taxable income and tax planning strategies in making this assessment. In the third quarter of 2021, the effective tax rate takes into consideration the estimated valuation allowance based on forecasted 2021 income. We continue to monitor income tax developments in the United States and other countries where we have legal entities. During the first quarter of 2021, the United States enacted the American Rescue Plan of 2021, which contains various tax provisions. As a result of this legislation, we have considered these tax provisions and do not expect any material impacts to our financial statements. We will incorporate into our future financial statements the impacts, if any, of future regulations and additional authoritative guidance when finalized.

Income Taxes

9 Months Ended

Sep. 30, 2021

13. Income Taxes

Our effective income tax rate fluctuates from the U.S. statutory tax rate based on, among other factors, changes in pretax income in jurisdictions with varying statutory tax rates, the impact of U.S. state and local taxes, the realizability of deferred tax assets and other differences related to the recognition of income and expense between U.S. GAAP and tax accounting.

Our effective income tax rate for the three months ended September 30, 2021 was 17.5%, compared with 10.4% for the three months ended September 30, 2020. The higher effective income tax rate for the three months ended September 30, 2021 was primarily attributable to the non-deductible portion of the goodwill impairment included in the 2020 estimated annual effective tax rate. This was partially offset by the valuation allowance included in the 2021 estimated annual effective tax rate.

Our effective income tax rate for the nine months ended September 30, 2021 was 15.7%, compared with 12.8% for the nine months ended September 30, 2020. The higher effective income tax rate for the nine months ended September 30, 2021 was primarily attributable to the non-deductible portion of the goodwill impairment included in the 2020 estimated annual effective tax rate. This was partially offset by the valuation allowance included in the 2021 estimated annual effective tax rate, and also state rate changes enacted during 2021.

In assessing the realizability of deferred tax assets, management considers whether it is more likely than not that some portion or all of the deferred tax assets will not be realized, and when necessary valuation allowances are provided. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. We assess the realizability of our deferred tax assets quarterly and consider carryback availability, the scheduled reversal of deferred tax liabilities, projected future taxable income and tax planning strategies in making this assessment. In the third quarter of 2021, the effective tax rate takes into consideration the estimated valuation allowance based on forecasted 2021 income.

We continue to monitor income tax developments in the United States and other countries where we have legal entities. During the first quarter of 2021, the United States enacted the American Rescue Plan of 2021, which contains various tax provisions. As a result of this legislation, we have considered these tax provisions and do not expect any material impacts to our financial statements. We will incorporate into our future financial statements the impacts, if any, of future regulations and additional authoritative guidance when finalized.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

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