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STOCK-BASED COMPENSATION. (Tables) | 9 Months Ended
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Sep. 30, 2019
Share-based Payment Arrangement [Abstract] |
Rollforward of stock options | The following table summarizes the status of, and changes in, our stock options during the nine months ended September 30, 2019.
| Options |  | Weighted- average exercise price
Outstanding at December 31, 2018 | 11,300,393 |  |  | $ | 69.05 |
Exercised | (2,847,972 | ) |  | $ | 63.58 |
Forfeited | (114,822 | ) |  | $ | 76.70 |
Expired | (7,839 | ) |  | $ | 59.03 |
Outstanding at September 30, 2019 | 8,329,760 |  |  | $ | 70.83 |
Exercisable at September 30, 2019 | 6,410,125 |  |  | $ | 69.12 |
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 nine months ended September 30, 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 | 7,404 |  |  | 55,872 |  |  | $ | 103.45 |
Vested | (9,670 | ) |  | (83,280 | ) |  | $ | 90.52 |
Forfeited | (9,619 | ) |  | (327,279 | ) |  | $ | 87.79 |
Nonvested at September 30, 2019 | 125,079 |  |  | 6,249,233 |  |  | $ | 87.15 |
Future stock-based compensation expense | The following table presents the compensation expense to be recognized over the remaining vesting periods of the stock-based awards outstanding at September 30, 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) |
Fourth quarter 2019 | $ | 43.6 |
2020 | 100.6 |
2021 through 2024 | 80.6 |
Total | $ | 224.8 |

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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=116856206&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=116856206&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=116856206&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 cost not yet recognized and weighted-average period over which cost is expected to be recognized for nonvested award under 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 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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