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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2018
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, 2018 |  | 33,222,364 |  | $ | 52.27 |  | 7.05 |  | $ | 1,180.3 |
Options granted |  | — |  |  |  |  |  |  |  |  |
Options exercised |  | (602,549) |  |  |  |  |  |  |  |  |
Options forfeited |  | (32,240) |  |  |  |  |  |  |  |  |
Options outstanding at March 31, 2018 |  | 32,587,575 |  |  | 52.58 |  | 6.84 |  |  | 1,093.2 |
Options granted |  | 6,111,100 |  |  |  |  |  |  |  |  |
Options exercised |  | (740,046) |  |  |  |  |  |  |  |  |
Options forfeited |  | (116,740) |  |  |  |  |  |  |  |  |
Options outstanding at June 30, 2018 |  | 37,841,889 |  | $ | 58.50 |  | 7.15 |  | $ | 1,089.4 |
Vested and non-vested options expected to vest at June 30, 2018 |  | 35,378,287 |  | $ | 57.63 |  | 7.06 |  | $ | 1,048.7 |
Exercisable options at June 30, 2018 |  | 18,269,909 |  | $ | 45.14 |  | 5.65 |  | $ | 767.5 |
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, 2018 |  | 19,600,440 |  | $ | 8.29 |
Options granted |  | — |  |  | — |
Options vested |  | (67,400) |  |  | 8.13 |
Options forfeited |  | (32,240) |  |  | 8.56 |
Non-vested options at March 31, 2018 |  | 19,500,800 |  |  | 8.29 |
Options granted |  | 6,111,100 |  |  | 12.82 |
Options vested |  | (5,923,180) |  |  | 8.35 |
Options forfeited |  | (116,740) |  |  | 8.18 |
Non-vested options at June 30, 2018 |  | 19,571,980 |  | $ | 9.69 |
Summary of activity in the option plans |
|  | Three Months Ended |  | Six Months Ended |
|  | June 30, |  | June 30, |
|  | 2018 |  | 2017 |  | 2018 |  | 2017 |
Total intrinsic value of stock options exercised |  | $ | 35.1 |  | $ | 79.6 |  | $ | 69.4 |  | $ | 114.1 |
Total fair value of stock options vested |  |  | 49.5 |  |  | 44.8 |  |  | 50.0 |  |  | 45.5 |
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, 2018 |  | 12,905 |  | $ | 73.25 |  | 0.37 |
Restricted shares granted |  | — |  |  | — |  |  |
Restricted shares outstanding at March 31, 2018 |  | 12,905 |  |  | 73.25 |  | 0.13 |
Shares vested and issued |  | (13,046) |  |  | 73.35 |  |  |
Restricted shares granted |  | 14,469 |  |  | 87.93 |  |  |
Restricted shares outstanding at June 30, 2018 |  | 14,328 |  | $ | 87.98 |  | 0.88 |

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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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