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Accounting for Income Taxes
 9 Months Ended
Sep. 30, 2024
Income Tax Disclosure [Abstract]  
Accounting for Income Taxes Accounting for Income Taxes
Our provision for income taxes was $50.0 million and $40.7 million for the three months ended September 30, 2024 and 2023, respectively, representing effective tax rates of 30.1% and 25.1%, respectively. Our provision for incomes taxes was $150.6 million and $147.3 million for the nine months ended September 30, 2024 and 2023, respectively, representing effective tax rates of 32.2% and 31.4%. Our effective tax rate differs from the statutory federal income tax rate of 21% for the three and nine months ended September 30, 2024 and 2023 primarily due to the recognition of additional tax expense resulting from U.S. taxes on foreign earnings, foreign income taxed at different rates, state income taxes, and non-deductible expenses in the U.S.

We exercise significant judgment in regards to estimates of future market growth, forecasted earnings and projected taxable income in determining the provision for income taxes and for purposes of assessing our ability to utilize any future benefit from deferred tax assets. We continue to assess the realizability of the deferred tax assets as we take into account new information. We may be required to adjust the valuation allowance for deferred tax assets if we determine, based on available evidence at the time of the determination, that it is more likely than not that some portion or all of the deferred tax assets will not be realized. Changes to the valuation allowance could have a material adverse effect on our results of operations.

Our total gross unrecognized tax benefits, excluding interest and penalties, were $156.2 million and $149.2 million as of September 30, 2024 and December 31, 2023, respectively, a material amount of which would impact our effective tax rate if recognized. The increase in our unrecognized tax benefits relates primarily to positions taken on income tax return calculations finalized during the three and nine months ended September 30, 2024.