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Income Taxes
 9 Months Ended
Sep. 30, 2021
Income Tax Disclosure [Abstract]  
Income Taxes Income TaxesIncome tax expense of $5.5 and $6.2 for the three months ended September 30, 2021 and 2020, respectively, represents taxes on both U.S. and foreign earnings at a combined effective income tax rate of 26.1% and 28.2%, respectively. Income tax expense of $9.9 and $8.9 for the nine months ended September 30, 2021 and 2020, respectively, represents taxes on both U.S. and foreign earnings at a combined effective income tax rate of 17.0% and 21.5%, respectively.
The effective income tax rates of 26.1% for the three months ended September 30, 2021 differed from the U.S. federal statutory rate of 21% primarily due to income earned by our certain foreign entities being taxed at higher rates than the U.S. federal statutory rate combined with a reduction of our foreign-derived intangible income deduction (FDII) as a result of lower forecasted taxable income in the U.S.
The effective income tax rates of 17.0% for the nine months ended September 30, 2021 differed from the U.S. federal statutory rate of 21% primarily due to excess tax benefits associated with share-based compensation and income incurred by certain of our foreign operations with a full valuation allowance, partially offset by income earned by our certain foreign entities being taxed at higher rates than the U.S. federal statutory rate.
The effective income tax rates of 28.2% and 21.5% for the three and nine months ended September 30, 2020, respectively, differed from the U.S. federal statutory rate of 21% primarily due to the effect of income earned by our certain foreign entities being taxed at higher rates than the U.S. federal statutory rate, losses incurred by some of our foreign operations for which no benefit was recorded, and the establishment of an APB 23 deferred tax liability associated with our discontinued operations which is partially offset by excess tax benefits associated with share-based compensation.
As of both September 30, 2021 and December 31, 2020, we had a liability for gross unrecognized tax benefits of $1.9. This amount includes $1.3 of unrecognized tax benefits as of both September 30, 2021 and December 31, 2020, which, if ultimately recognized, would reduce our annual effective income tax rate. We recognized interest and penalties of $0.3 related to uncertain tax positions in income tax expense as of September 30, 2021.