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STOCK-BASED COMPENSATION. (Tables) | 3 Months Ended
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Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Rollforward of stock options | The following table summarizes the status of, and changes in, our stock options during the three months ended March 31, 2019.
| Options |  | Weighted- average exercise price
Outstanding at December 31, 2018 | 11,300,393 |  |  | $ | 69.05 |
Exercised | (972,655 | ) |  | $ | 60.26 |
Forfeited | (65,534 | ) |  | $ | 76.57 |
Expired | (7,807 | ) |  | $ | 59.07 |
Outstanding at March 31, 2019 | 10,254,397 |  |  | $ | 69.84 |
Exercisable at March 31, 2019 | 8,272,310 |  |  | $ | 68.24 |
Rollforward of nonvested restricted shares and restricted stock units | The following table summarizes the status of, and changes in, our nonvested restricted shares and restricted stock units during the three months ended March 31, 2019.
| Restricted shares |  | Restricted stock units |  | Weighted-average fair value
Nonvested at December 31, 2018 | 136,964 |  |  | 6,603,920 |  |  | $ | 87.07 |
Time-based grants | — |  |  | 20,307 |  |  | $ | 92.37 |
Vested | (400 | ) |  | (26,129 | ) |  | $ | 99.36 |
Forfeited | (4,928 | ) |  | (212,992 | ) |  | $ | 87.99 |
Nonvested at March 31, 2019 | 131,636 |  |  | 6,385,106 |  |  | $ | 87.01 |
Future stock-based compensation expense | The following table presents the compensation expense (in millions) to be recognized over the remaining vesting periods of the stock-based awards outstanding at March 31, 2019. Estimated future compensation expense will change to reflect future grants of restricted stock awards and units, future option grants, changes in the probability of performance thresholds being met, and adjustments for actual forfeitures.
(in millions) |
Second quarter 2019 | $ | 49.0 |
Third quarter 2019 | 48.9 |
Fourth quarter 2019 | 43.8 |
2020 | 104.6 |
2021 through 2024 | 83.2 |
Total | $ | 329.5 |

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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- Definition Tabular disclosure of the total compensation cost related to nonvested awards not yet recognized and the weighted-average period over which it is expected to be recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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