Income Taxes	6 Months Ended
Jun. 30, 2020
Income Tax Disclosure [Abstract]
Income Taxes	Income TaxesOur overall effective income tax rates were 24.4% for both the three and six months ended June 30, 2020 and 26.6% and 26.8% for the three and six months ended June 30, 2019, respectively. The rates for the three and six months ended June 30, 2020 resulted in income tax expense of $27.2 million and $39.0 million, respectively, compared to income tax expense of $19.7 million and $34.8 million for the three and six months ended June 30, 2019, respectively. The year-over-year decrease in our effective tax rate for the three and six months ended June 30, 2020 was primarily due to windfalls on our equity awards as well as energy tax credits that expired on December 31, 2017 and were retroactively extended by the Further Consolidated Appropriations Act, 2020 (H.R. 1865, PL 116-94) signed by the President on December 20, 2019.

- 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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