Income Taxes	9 Months Ended
Sep. 30, 2016
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES Our effective tax rate was 36 percent and 35 percent for the three-month and nine-month periods ended September 30, 2016, respectively, and 39 percent and 41 percent for the three-month and nine-month periods ended September 30, 2015, respectively. The decrease in the 2016 rates results primarily from the tax benefit of the domestic production deduction which allows a deduction for certain qualified production activities within the U.S. This deduction was not available in 2015 due to the utilization of our U.S. Federal loss carryforward. Additionally, the decrease in the nine-month rate is impacted by an $18 million valuation allowance against the deferred tax assets of TopBuild recorded as a non-cash charge to income tax expense in the second quarter of 2015. The TopBuild deferred tax assets have been impaired by our decision to spin off TopBuild into a separate company that on a stand-alone basis as of June 30, 2015, the spin off date, was unlikely to be able to realize the value of such deferred tax assets as a result of its history of losses.

Income Taxes

9 Months Ended

Sep. 30, 2016

INCOME TAXES

Our effective tax rate was 36 percent and 35 percent for the three-month and nine-month periods ended September 30, 2016, respectively, and 39 percent and 41 percent for the three-month and nine-month periods ended September 30, 2015, respectively. The decrease in the 2016 rates results primarily from the tax benefit of the domestic production deduction which allows a deduction for certain qualified production activities within the U.S. This deduction was not available in 2015 due to the utilization of our U.S. Federal loss carryforward. Additionally, the decrease in the nine-month rate is impacted by an $18 million valuation allowance against the deferred tax assets of TopBuild recorded as a non-cash charge to income tax expense in the second quarter of 2015. The TopBuild deferred tax assets have been impaired by our decision to spin off TopBuild into a separate company that on a stand-alone basis as of June 30, 2015, the spin off date, was unlikely to be able to realize the value of such deferred tax assets as a result of its history of losses.