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Income Taxes
 6 Months Ended
Jun. 30, 2022
Income Tax Disclosure [Abstract]  
Income Taxes Income Taxes
Income tax expense of $3.5 and $1.3 for the three months ended June 30, 2022 and 2021, respectively, represents taxes on both U.S. and foreign earnings at a combined effective income tax rate of 20.5% and 16.3%, respectively. Income tax expense of $5.6 and $4.4 for the six months ended June 30, 2022 and 2021, respectively, represents taxes on both U.S. and foreign earnings at a combined effective income tax rate of 18.8% and 11.9%, respectively.
The effective income tax rates of 20.5% and 18.8% for the three and six months ended June 30, 2022 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 offset by excess tax benefits associated with share-based compensation, and global R&D tax credits.
The effective income tax rates of 16.3% and 11.9% for the three and six months ended June 30, 2021 differed from the U.S. federal statutory rate of 21% primarily due to losses incurred by some of our foreign operations for which no benefit 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.