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STOCK-BASED COMPENSATION. (Tables) | 12 Months Ended
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Dec. 31, 2019
Share-based Payment Arrangement [Abstract] |
Rollforward of stock options | The following table summarizes the status of, and changes in, our stock options during 2019.
| Options |  | Weighted- average exercise price |  | Weighted-average remaining contractual term in years
Outstanding at December 31, 2018 | 11,300,393 |  |  | $ | 69.05 |  |  |
Exercised | (3,787,735 | ) |  | $ | 64.92 |  |  |
Forfeited | (116,751 | ) |  | $ | 76.69 |  |  |
Expired | (7,839 | ) |  | $ | 59.03 |  |  |
Outstanding at December 31, 2019 | 7,388,068 |  |  | $ | 71.06 |  |  | 3.8
Exercisable at December 31, 2019 | 6,716,511 |  |  | $ | 70.58 |  |  | 3.7
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 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 |  |  | 2,120,284 |  |  | $ | 120.22 |
Performance-based grants | — |  |  | 84,240 |  |  | $ | 120.79 |
Vested (value at vest date was $227.1 million) | (126,885 | ) |  | (1,741,795 | ) |  | $ | 84.18 |
Nonvested dividend equivalents granted to non-employee directors | — |  |  | 1,808 |  |  | $ | 111.26 |
Forfeited | (10,079 | ) |  | (350,196 | ) |  | $ | 87.84 |
Nonvested at December 31, 2019 | 7,404 |  |  | 6,718,261 |  |  | $ | 98.75 |
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 December 31, 2019. Estimated future compensation expense will change to reflect future grants, changes in the probability of performance thresholds being met, and adjustments for actual forfeitures.
(in millions) |
First quarter 2020 | $ | 59.6 |
Second quarter 2020 | 54.5 |
Third quarter 2020 | 53.2 |
Fourth quarter 2020 | 46.3 |
Total 2020 | 213.6 |
2021 through 2025 | 198.0 |
Total | $ | 411.6 |

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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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