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Income Taxes
 9 Months Ended
Sep. 30, 2021
Income Tax Disclosure [Abstract]  
Income Taxes Income Taxes
The Company records its tax provision or benefit on an interim basis using an estimated annual effective tax rate. This rate is applied to the current period ordinary income to determine the income tax provision or benefit allocated to the interim period. Losses from jurisdictions for which no benefit can be recognized, and the income tax effects of unusual and infrequent items are excluded from the estimated annual effective tax rate and are recognized in the impacted interim period as discrete items. Valuation allowances are provided against the future tax benefits that arise from the losses in jurisdictions for which no benefit can be recognized. The estimated annual effective tax rate may be significantly impacted by nondeductible expenses and the Company’s projected earnings mix by tax jurisdiction. Adjustments to the estimated annual effective income tax rate are recognized in the period when such estimates are revised.
Income tax expense for the three months ended September 30, 2021 and 2020 were $6.8 million and $2.3 million, respectively.
Income tax expense for the nine months ended September 30, 2021 and 2020 were $48.5 million and $4.0 million, respectively.
Our effective income tax rates were as follows:
Three Months Ended September 30,Nine Months Ended September 30,
2021202020212020
Effective income tax rates24.3 %20.0 %26.6 %30.2 %
The decrease in our effective tax rate for the nine months ended September 30, 2021 as compared to the nine months ended September 30, 2020, was primarily attributable to the impact of a discrete deferred tax gain impacting the valuation allowance on deferred tax assets.

The increase in our effective tax rate for the three months ended September 30, 2021 as compared to the three-months ended September 30, 2020, was primarily attributable to the reassessment of the recoverability of deferred tax assets and its projected earnings mix by geography and tax jurisdiction as compared to the prior period.