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Stockholders' Equity | 3 Months Ended
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Mar. 31, 2018
Stockholders' Equity Note [Abstract] |
Stockholders' Equity | Stockholders' Equity 1.625% Exchange As described in Note 7, “Debt,” we issued 1.8 million shares of our common stock in connection with the 1.625% Exchange in March 2018. 1.125% Warrants In connection with the Call Spread Overlay transaction described in Note 8, “Derivatives,” in 2013, we issued 13,490,236 warrants with a strike price of $53.8475 per share. Under certain circumstances, beginning in April 2020, when the price of our common stock exceeds the strike price of the 1.125% Warrants, we will be obligated to issue shares of our common stock subject to a share delivery cap. The 1.125% Warrants could separately have a dilutive effect to the extent that the market value per share of our common stock exceeds the applicable strike price of the 1.125% Warrants. Refer to Note 3, “Net Income per Share,” for dilution information for the periods presented. We will not receive any additional proceeds if the 1.125% Warrants are exercised. Share-Based Compensation In connection with our equity incentive plans and employee stock purchase plan, approximately 127,000 shares of common stock vested or were purchased, net of shares used to settle employees’ income tax obligations, during the three months ended March 31, 2018. We record share-based compensation as “General and administrative expenses” in the accompanying consolidated statements of income. As of March 31, 2018, there was $53 million of total unrecognized compensation expense related to unvested restricted stock awards (RSAs), performance stock awards (PSAs), and performance stock units (PSUs), which we expect to recognize over a remaining weighted-average period of 3.2 years, 0.9 years and 2.7 years, respectively. This unrecognized compensation cost assumes an estimated forfeiture rate of 9.7% for non-executive employees as of March 31, 2018. Also as of March 31, 2018, there was $13 million of total unrecognized compensation expense related to unvested stock options, which we expect to recognize over a weighted-average period of 2.5 years. No stock options were granted or exercised in the three months ended March 31, 2018. Activity for RSAs, PSAs and PSUs, for the three months ended March 31, 2018, is summarized below:
| Restricted Stock Awards |  | Performance Stock Awards |  | Performance Stock Units |  | Total |  | Weighted Average Grant Date Fair Value
Unvested balance, December 31, 2017 | 401,804 |  |  | 84,762 |  |  | 91,828 |  |  | 578,394 |  |  | $ | 58.35 |
Granted | 321,798 |  |  | — |  |  | 188,455 |  |  | 510,253 |  |  | 72.46 |
Vested | (163,043 | ) |  | (32,929 | ) |  | — |  |  | (195,972 | ) |  | 55.16 |
Forfeited | (59,931 | ) |  | (44,384 | ) |  | (47,650 | ) |  | (151,965 | ) |  | 62.99 |
Unvested balance, March 31, 2018 | 500,628 |  |  | 7,449 |  |  | 232,633 |  |  | 740,710 |  |  | 67.96 |
The total fair value of awards granted and vested is presented in the following table:
| Three Months Ended March 31,
| 2018 |  | 2017
| (In millions)
Granted: |  |  |
Restricted stock awards | $ | 23 |  |  | $ | 17 |
Performance stock units | 14 |  |  | — |
| $ | 37 |  |  | $ | 17 |
Vested: |  |  |
Restricted stock awards | $ | 12 |  |  | $ | 10 |
Performance stock awards | 3 |  |  | 6 |
| $ | 15 |  |  | $ | 16 |

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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