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Income Taxes
 3 Months Ended
Mar. 31, 2022
Income Tax Disclosure [Abstract]  
Income Taxes Income Taxes
Income tax expense of $2.1 and $3.1 for the three months ended March 31, 2022 and 2021, respectively, represents taxes on both U.S. and foreign earnings at a combined effective income tax rate of 16.5% and 10.7%, respectively.
The effective income tax rates of 16.5% for the three months ended March 31, 2022 differed from the U.S. federal statutory rate of 21% primarily due to income incurred by some of our foreign operations for which no detriment was recorded, partially offset by the effect of income earned by our certain foreign entities being taxed at higher rates than the U.S. federal statutory rate and excess tax benefits associated with share-based compensation.
The effective income tax rates of 10.7% for the three months ended March 31, 2021, differed from the U.S. federal statutory rate of 21% primarily due to losses incurred by certain of our foreign operations for which no benefit was recorded, partially offset by the effect of income earned by certain of our foreign entities being taxed at higher rates than the U.S. federal statutory rate and excess tax benefits associated with share-based compensation.
As of both March 31, 2022 and December 31, 2021, we had a liability for gross unrecognized tax benefits of $1.7. This amount includes $1.2 of unrecognized tax benefits as of March 31, 2022 and December 31, 2021, 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 March 31, 2022.