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Common Stock and Stock-Based Compensation Stockholders Equity (Policies) | 9 Months Ended
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Sep. 30, 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 share repurchase program effective March 7, 2019 through December 31, 2020. The new share repurchase program authorizes the Company to repurchase up to $350.0 million of its common stock, not to exceed 13.7 million shares. The 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 and nine months ended September 30, 2019, we repurchased 5,171,489 and 10,778,492 shares, respectively, at a cost of approximately $100.9 million and $233.9 million, respectively. The total for the nine months ended September 30, 2019 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 September 30, 2019, the Company had a remaining authorization to repurchase up to $186.1 million, not to exceed 5.5 million shares, of its common stock under the current repurchase program. Certain shares of stock repurchased during September 2019, totaling $9.0 million, were cash settled in October 2019 in accordance with normal settlement practices. During the three and nine months ended September 30, 2018, 1,356,484 and 4,327,158 shares, respectively, were repurchased at a cost of approximately $50.0 million and $150.1 million, respectively, under the prior share repurchase program.
Share-based Payment Arrangement [Text Block] | Stock-Based Compensation Stock-based compensation totaled approximately $8.4 million and $21.4 million for the three and nine months ended September 30, 2019, respectively. Stock-based compensation totaled approximately $7.6 million and $21.8 million for the three and nine months ended September 30, 2018, respectively. The Company's annual grant of share-based awards generally occurs in the second quarter under our 2004 Fourth Amended and Restated Stock Option and Incentive Plan (the "Plan”). Expense related to restricted stock units issued to eligible employees under the Plan is recognized ratably over the vesting period, generally between three years and four years. Expense related to performance units is recognized ratably from their award date to the end of the performance period, generally three years. Expense related to restricted stock awards granted to non-employee directors under the Plan is recognized ratably over the vesting period, generally one year. The following table summarizes stock-based compensation awards granted during the nine months ended September 30, 2019:
| Number of Shares Granted |  | Weighted Average Grant-Date Fair Value per Award
Restricted stock units | 956,235 |  |  | $ | 22.20 |
Restricted stock awards | 20,321 |  |  | $ | 22.27 |
Performance units | 476,394 |  |  | $ | 22.22 |

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