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Common Stock and Stock-Based Compensation Stockholders Equity (Policies)	3 Months Ended
	Mar. 31, 2019
Equity [Abstract]
Stockholders' Equity, Policy [Policy Text Block]	Stockholders' Equity In December 2017, our Board of Directors authorized a $500 million share repurchase program effective January 1, 2018 through December 31, 2019. On November 16, 2018, we entered into an accelerated share repurchase program (the "ASR Program") to repurchase $350 million of the Company's common stock. The $350 million notional value of the ASR Program represented the entire remaining amount that was available to us under the share repurchase program that was in effect at that time. The ASR Program was completed in March 2019. In March 2019, our Board of Directors authorized a new $350.0 million share repurchase program effective March 7, 2019 through December 31, 2020. The new share repurchase program is designed to meet certain IRS safe harbor guidelines associated with our spin-off of Arcosa, which was completed on November 1, 2018. During the three months ended March 31, 2019, we repurchased 3,473,887 shares at a cost of approximately $89.0 million. This total includes 2,607,172 shares at a cost of approximately $70.0 million representing the final settlement of the ASR Program, which was funded in November 2018 but a portion of which remained outstanding as of December 31, 2018. As of March 31, 2019, we had a remaining authorization of $331.0 million under the new repurchase program. Certain shares of stock repurchased during March 2019, totaling $4.0 million, were cash settled in April 2019 in accordance with normal settlement practices. During the three months ended March 31, 2018, 1,519,503 shares were repurchased at a cost of approximately $50.0 million under the prior share repurchase program.
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]	Stock-Based Compensation Stock-based compensation totaled approximately $5.5 million and $6.2 million for the three months ended March 31, 2019 and 2018, respectively.