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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2019
Stock-Based Compensation |
Schedule of stock option activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​ |
​ | ​ | ​ | ​ | ​ | ​ | Average | ​ | Aggregate |
​ | ​ | ​ | ​ | Weighted | ​ | Remaining | ​ | Intrinsic |
​ | ​ | ​ | ​ | Average | ​ | Contractual | ​ | Value | ​
​ |  | Options |  | Exercise Price |  | Term (in years) |  | (in millions) |
Options outstanding at January 1, 2019 |  | 35,550,668 | ​ | $ | 59.77 |  | 6.81 | ​ | $ | 798.6 | ​
Options granted |  | 40,000 | ​ |  | 78.12 | ​ | ​ | ​ | ​ | ​ | ​
Options exercised |  | (1,269,121) | ​ |  | 37.30 | ​ | ​ | ​ | ​ | ​ | ​
Options forfeited |  | (40,440) | ​ |  | 75.17 | ​ | ​ | ​ | ​ | ​ | ​
Options outstanding at March 31, 2019 |  | 34,281,107 | ​ | ​ | 60.60 | ​ | 6.67 | ​ | ​ | 1,160.0 | ​
Options granted |  | 6,105,700 | ​ |  | 89.55 | ​ | ​ | ​ | ​ | ​ | ​
Options exercised |  | (1,816,225) | ​ |  | 38.18 | ​ | ​ | ​ | ​ | ​ | ​
Options forfeited |  | (55,020) | ​ |  | 78.67 | ​ | ​ | ​ | ​ | ​ | ​
Options outstanding at June 30, 2019 |  | 38,515,562 | ​ | ​ | 66.22 |  | 7.08 | ​ | ​ | 1,144.7 | ​
Options granted |  | 31,000 | ​ |  | 96.82 | ​ | ​ | ​ | ​ | ​ | ​
Options exercised |  | (589,497) | ​ |  | 50.17 | ​ | ​ | ​ | ​ | ​ | ​
Options forfeited |  | (70,910) | ​ |  | 77.80 | ​ | ​ | ​ | ​ | ​ | ​
Options outstanding at September 30, 2019 |  | 37,886,155 | ​ | $ | 66.47 |  | 6.86 | ​ | $ | 1,137.6 | ​
Vested and non-vested options expected to vest at September 30, 2019 |  | 35,657,175 | ​ | $ | 65.79 |  | 6.78 | ​ | $ | 1,095.1 | ​
Exercisable options at September 30, 2019 |  | 18,810,385 | ​ | $ | 53.76 |  | 5.43 | ​ | $ | 804.0 | ​
Summary of status of non-vested options and changes during the year | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted |
​ | ​ | ​ | ​ | Average | ​
​ | ​ | ​ | ​ | Fair Value at | ​
​ | ​ | Options | ​ | Grant Date |
Non-vested options at January 1, 2019 |  | 19,289,500 | ​ | $ | 9.73 | ​
Options granted |  | 40,000 | ​ |  | 10.48 | ​
Options vested |  | (61,900) | ​ |  | 8.27 | ​
Options forfeited |  | (40,440) | ​ |  | 9.74 | ​
Non-vested options at March 31, 2019 |  | 19,227,160 | ​ | ​ | 9.74 | ​
Options granted |  | 6,105,700 | ​ |  | 12.27 | ​
Options vested |  | (6,061,740) | ​ |  | 9.19 | ​
Options forfeited |  | (55,020) | ​ |  | 10.87 | ​
Non-vested options at June 30, 2019 |  | 19,216,100 | ​ | ​ | 10.71 | ​
Options granted |  | 31,000 | ​ |  | 12.85 | ​
Options vested |  | (100,420) | ​ |  | 8.78 | ​
Options forfeited |  | (70,910) | ​ |  | 10.58 | ​
Non-vested options at September 30, 2019 |  | 19,075,770 | ​ | $ | 10.72 | ​
Summary of activity in the option plans | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three Months Ended |  | Nine Months Ended |
​ | ​ | September 30, | ​ | September 30, | ​
​ | ​ | 2019 | ​ | 2018 | ​ | 2019 | ​ | 2018 | ​
Total intrinsic value of stock options exercised | ​ | $ | 27.0 | ​ | $ | 111.8 | ​ | $ | 207.4 | ​ | $ | 181.1 | ​
Total fair value of stock options vested | ​ |  | 0.9 | ​ |  | 0.9 | ​ |  | 57.1 | ​ |  | 50.9 | ​
Schedule of restricted share activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted Average | ​
​ | ​ | ​ | ​ | ​ | ​ | Remaining | ​
​ | ​ | Restricted | ​ | Fair Value at | ​ | Amortization | ​
​ |  | Shares |  | Grant Date |  | Term (in years) |
Restricted shares outstanding at January 1, 2019 |  | 14,873 | ​ | $ | 87.89 | ​ | 0.39 | ​
Restricted shares granted |  | — | ​ |  | — | ​ | ​ | ​
Restricted shares outstanding at March 31, 2019 |  | 14,873 | ​ | ​ | 87.89 |  | 0.14 | ​
Shares vested and issued |  | (14,873) | ​ |  | 87.89 | ​ | ​ | ​
Restricted shares granted |  | 14,304 | ​ |  | 89.49 | ​ | ​ | ​
Restricted shares outstanding at June 30, 2019 |  | 14,304 | ​ | ​ | 89.49 |  | 0.89 | ​
Restricted shares granted |  | — | ​ |  | — | ​ | ​ | ​
Restricted shares outstanding at September 30, 2019 |  | 14,304 |  | $ | 89.49 |  | 0.64 | ​

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