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Share-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary of Activity Under Share-Based Compensation Plans | The following table summarizes the activity for stock appreciation rights, or SARs, under all share-based compensation plans for the six months ended June 30, 2020:
|  | Number of Awards |  |  | Weighted-Average Exercise Price Per Award |  |  | Weighted-Average Remaining Contractual Term |  | Aggregate Intrinsic Value(1) |
|  | (in thousands) |  |  |  |  |  |  |  |  | (in millions) |
Outstanding as of December 31, 2019(2)(3) |  |  | 7,001 |  |  | $ | 27.85 |  |  | 5.4 years |  | $ | 138.7 |
Granted |  |  | — |  |  | $ | — |  |  |  |  |  |  |
Exercised |  |  | (1,228 | ) |  | $ | 31.32 |  |  |  |  |  |  |
Forfeited |  |  | (7 | ) |  | $ | 29.03 |  |  |  |  |  |  |
Outstanding as of June 30, 2020(2)(3) |  |  | 5,766 |  |  | $ | 27.11 |  |  | 4.8 years |  | $ | 103.0 |
Exercisable as of June 30, 2020(4) |  |  | 5,753 |  |  | $ | 27.10 |  |  | 4.8 years |  | $ | 102.9 |
Vested and expected to vest as of June 30, 2020 |  |  | 5,766 |  |  | $ | 27.11 |  |  | 4.8 years |  | $ | 103.0 |
(1) | The intrinsic value is the amount by which the current market value of the underlying stock exceeds the exercise price of the SARs.
(2) | Includes less than 0.1 million market condition SARs as of both June 30, 2020 and December 31, 2019.
(3) | Includes 2.1 million and 2.9 million performance condition SARs as of June 30, 2020 and December 31, 2019, respectively, which represents the maximum amount that can vest.
(4) | Includes less than 0.1 million market condition and 2.1 million performance condition SARs.
The following table summarizes the activities for stock units under all share-based compensation plans for the six months ended June 30, 2020:
|  | Number of Shares |  |  | Weighted-Average Grant Date Fair Value Per Share |
|  | (in thousands) |  |  |  |  |
Outstanding and nonvested as of December 31, 2019(1) |  |  | 1,833 |  |  | $ | 49.49 |
Granted(2) |  |  | 1,893 |  |  | $ | 39.20 |
Vested |  |  | (317 | ) |  | $ | 49.36 |
Forfeited |  |  | (71 | ) |  | $ | 44.58 |
Outstanding and nonvested as of June 30, 2020(1) |  |  | 3,338 |  |  | $ | 43.77 |
Expected to vest as of June 30, 2020(3) |  |  | 2,822 |  |  | $ | 43.13 |
(1) | Includes 980,338 and 475,430 performance-based stock unit awards as of June 30, 2020 and December 31, 2019, respectively, which represents the maximum amount that can vest.
(2) | Includes 504,908 performance-based stock unit awards.
(3) | Includes 506,200 performance-based stock unit awards.

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- Definition Tabular disclosure of share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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