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Stock-Based Compensation (Tables) | 3 Months Ended
--- | ---
Mar. 31, 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 |
Vested and non-vested options expected to vest at March 31, 2018 |  | 30,726,902 |  | $ | 51.92 |  | 6.76 |  | $ | 1,051.0 |
Exercisable options at March 31, 2018 |  | 13,086,775 |  | $ | 39.76 |  | 5.20 |  | $ | 606.8 |
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 |
Summary of activity in the option plans |
|  | Three Months Ended |
|  | March 31, |
|  | 2018 |  | 2017 |
Total intrinsic value of stock options exercised |  | $ | 34.3 |  | $ | 34.5 |
Total fair value of stock options vested |  |  | 0.5 |  |  | 0.7 |
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 |

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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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