Stock-based compensation | NOTE 7 – STOCK-BASED COMPENSATION. EFFECT OF SPECIAL CASH DIVIDEND. As a result of the special cash dividend declared by the Board of Directors in February 2015, the anti-dilution provisions of our employee long-term incentive plans and non-employee director plans (collectively the LTI Plans) require an automatic adjustment to neutralize the effect of the special dividend. On the special dividend's ex-dividend date (April 7, 2015), the number of shares authorized and the number of stock options outstanding and their exercise price were adjusted resulting in an increase of 749,578 stock options outstanding on the ex-dividend date, and no incremental compensation expense. STOCK OPTIONS. The following table summarizes the status of and changes in our stock option grants during the first nine months of 2015 . All numbers have been adjusted to reflect the effect of the special dividend as noted above. Options Weighted- average exercise price Outstanding at December 31, 2014 30,463,211 $ 55.63 Semi-annual grants 3,948,307 $ 75.95 New hire grants 24,735 $ 73.24 Non-employee director grants 8,700 $ 82.40 Exercised (2,408,351 ) $ 42.95 Forfeited (370,846 ) $ 68.26 Expired (3,140 ) $ 63.33 Outstanding at September 30, 2015 31,662,616 $ 59.00 Exercisable at September 30, 2015 16,685,964 $ 49.93 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 nine months of 2015 . Restricted shares Restricted stock units Weighted-average fair value Nonvested at December 31, 2014 2,061,559 1,006,753 $ 72.79 Time-based grants 9,550 1,418,336 $ 76.34 Performance-based grants — 64,050 $ 76.18 Vested (16,452 ) (12,390 ) $ 77.24 Forfeited (57,953 ) (36,251 ) $ 73.27 Nonvested at September 30, 2015 1,996,704 2,440,498 $ 73.94 The nonvested at September 30, 2015 , includes 28,800 performance-based restricted shares and 211,575 performance-based restricted stock units. These performance-based restricted shares and units include 28,800 restricted shares and 147,525 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 September 30, 2015 . Estimated future compensation expense will change to reflect future option grants; future awards of unrestricted shares and restricted stock units; changes in estimated forfeitures; changes in the probability of performance thresholds being met; and adjustments for actual forfeitures. Fourth quarter 2015 $ 40.2 2016 117.5 2017 through 2020 125.7 Total $ 283.4 |