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Income Taxes
 6 Months Ended
Jun. 30, 2022
Income Tax Disclosure [Abstract]  
Income Taxes Income Taxes
For the three months ended June 30, 2022 and June 30, 2021, we recorded an income tax expense of $42.3 million and an income tax benefit of $48.3 million, respectively, and for the six months ended June 30, 2022 and June 30, 2021, we recorded an income tax expense of $44.0 million and an income tax benefit of $50.6 million, respectively. The change is primarily due to improved operational results over the comparison period.
Our income tax benefit or expense is based on an annual effective tax rate forecast, including estimates and assumptions that could change during the year. The application of the accounting requirements for income taxes in interim periods, after consideration of our valuation allowance on domestic losses, causes a significant variation in the typical relationship between income tax expense/benefit and pre-tax accounting income/loss as reported on the consolidated statement of operations.
As of June 30, 2022, all of Century's U.S. and certain foreign deferred tax assets, net of deferred tax liabilities, continue to be subject to a valuation allowance.