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STOCK-BASED COMPENSATION. | 3 Months Ended
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Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
STOCK-BASED COMPENSATION | STOCK-BASED COMPENSATION. STOCK OPTIONS. The following table summarizes the status of, and changes in, our stock options during the first quarter of 2018.
| Options |  | Weighted- average exercise price
Outstanding at December 31, 2017 | 15,221,123 |  |  | $ | 66.98 |
Exercised | (1,492,576 | ) |  | $ | 59.69 |
Forfeited | (24,538 | ) |  | $ | 75.74 |
Expired | (14,364 | ) |  | $ | 71.15 |
Outstanding at March 31, 2018 | 13,689,645 |  |  | $ | 67.76 |
Exercisable at March 31, 2018 | 9,635,926 |  |  | $ | 64.42 |
RESTRICTED SHARES AND STOCK UNITS. The following table summarizes the status of, and changes in, our nonvested restricted shares and restricted stock units during the first quarter of 2018.
| Restricted shares |  | Restricted stock units |  | Weighted-average fair value
Nonvested at December 31, 2017 | 473,115 |  |  | 5,556,911 |  |  | $ | 82.37 |
Time-based grants | — |  |  | 4,741 |  |  | $ | 106.77 |
Vested | (1,420 | ) |  | (10,294 | ) |  | $ | 72.43 |
Forfeited | (3,626 | ) |  | (37,854 | ) |  | $ | 78.52 |
Nonvested at March 31, 2018 | 468,069 |  |  | 5,513,504 |  |  | $ | 82.43 |
Nonvested at March 31, 2018, includes 7,200 performance-based restricted shares and 406,412 performance-based restricted stock units. These performance-based restricted shares and units include 7,200 restricted shares and 291,958 restricted stock units for which the performance period has lapsed and the performance threshold has been met. 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, 2018. 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.
Second quarter 2018 | $ | 46.3 |
Third quarter 2018 | 45.7 |
Fourth quarter 2018 | 40.1 |
2019 | 95.9 |
2020 through 2023 | 79.5 |
Total | $ | 307.5 |

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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