Income Taxes	3 Months Ended
Mar. 31, 2021
Income Tax Disclosure [Abstract]
Income Taxes	5. Income Taxes Income tax expense for the three months ended March 31, 2021 and 2020 has been computed using estimated annual effective tax rates. These rates are revised, if necessary, at the end of each successive interim period to reflect current estimates of the annual effective tax rates. The tax provision was comprised of a U.S. federal income tax expense of $21.3 million and a benefit of $15.2 million for the three months ended March 31, 2021 and 2020, respectively. The Company and its subsidiaries file income tax returns in the U.S. federal jurisdiction and various state jurisdictions, and have previously filed in foreign jurisdictions. The Company and its subsidiaries are subject to U.S. federal and state income tax examinations and foreign examinations for years after 2016.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

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