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Stockholders' Equity | 6 Months Ended
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Jun. 30, 2020
Equity [Abstract] |
Stockholders' Equity | Stockholders' Equity Stock Purchase Program In early December 2019, our board of directors authorized the purchase of up to $500 million, in the aggregate, of our common stock. This program was funded by existing cash on hand and was completed in March 2020. Under this program, pursuant to a Rule 10b5-1 trading plan, we purchased approximately 3.4 million shares of our common stock for $446 million in the first quarter of 2020 (average cost of $132.45 per share). In the first quarter of 2020, we also paid $7 million to settle shares purchased in late December 2019. 1.125% Warrants For a description of the 1.125% Warrants, refer to our 2019 Annual Report on Form 10-K, Note 12, “Derivatives,” and Note 14, “Stockholders’ Equity.” Approximately 310,000 of the 1.125% Warrants were outstanding at December 31, 2019. In the first quarter of 2020, we entered into privately negotiated termination agreements under which we paid $30 million to the Counterparties for the termination of the remaining 1.125% Warrants outstanding, which resulted in a reduction of additional paid-in-capital for the same amount. Share-Based Compensation In connection with our employee stock plans, approximately 188,000 shares of common stock vested or were purchased, net of shares used to settle employees’ income tax obligations, during the six months ended June 30, 2020. Share-based compensation is recorded to “General and administrative expenses” in the accompanying consolidated statements of income. Total share-based compensation expense amounted to $16 million and $10 million, respectively, in the second quarter of 2020 and 2019. Total share-based compensation expense amounted to $28 million and $19 million, respectively, in the six months ended June 30, 2020 and 2019. As of June 30, 2020, there was approximately $85 million of total unrecognized compensation expense related to unvested restricted stock awards (“RSAs”), and performance stock units (“PSUs”), which we expect to recognize over remaining weighted-average periods of 2.7 years and 1.7 years, respectively. This unrecognized compensation cost assumes an estimated forfeiture rate of 11.3% for non-executive employees as of June 30, 2020. As of June 30, 2020, there was also $1 million of total unrecognized compensation expense related to unvested stock options, which will be recognized by the end of 2020. No stock options were granted or exercised in the six months ended June 30, 2020. Activity for RSAs and PSUs is summarized below:
| RSAs |  | PSUs |  | Total |  | Weighted Average Grant Date Fair Value
Unvested balance, December 31, 2019 | 447,680 |  |  | 324,078 |  |  | 771,758 |  |  | $ | 102.01 |
Granted | 318,299 |  |  | 185,422 |  |  | 503,721 |  |  | 123.07 |
Vested | (160,927) |  |  | (7,368) |  |  | (168,295) |  |  | 93.34 |
Forfeited | (20,073) |  |  | (26,096) |  |  | (46,169) |  |  | 103.65 |
Unvested balance, June 30, 2020 | 584,979 |  |  | 476,036 |  |  | 1,061,015 |  |  | $ | 113.31 |
The aggregate fair values of RSAs and PSUs granted and vested are presented in the following table:
| Six Months Ended June 30, |  |
| 2020 |  | 2019
| (In millions) |  |
Granted: |  |  |
RSAs | $ | 39 |  |  | $ | 30 |
PSUs | 23 |  |  | 19 |
Total granted | $ | 62 |  |  | $ | 49 |
Vested: |  |  |
RSAs | $ | 20 |  |  | $ | 18 |
PSUs | 1 |  |  | 2 |
Total vested | $ | 21 |  |  | $ | 20 |

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(e)(1)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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