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SHARE-BASED COMPENSATION (Tables) | 9 Months Ended
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Sep. 30, 2019
Share-based Payment Arrangement [Abstract] |
Summary of Stock Option Activity Under All Stock Plans | A summary of stock option activity under all stock plans for the nine months ended September 30, 2019, is presented as follows (in millions, except per share amounts):
|  | Stock Options Outstanding |  |
|  | Number Outstanding |  | Weighted Average Exercise Price Per Share
Balance at December 31, 2018 |  | 6.2 |  |  | $ | 200.79 |
Granted |  | 0.6 |  |  | $ | 521.46 |
Exercised |  | (1.0) |  |  | $ | 154.71 |
Forfeited/expired |  | (0.1) |  |  | $ | 344.13 |
Balance at September 30, 2019 |  | 5.7 |  |  | $ | 239.91 |
Summary of RSU Activity | A summary of RSUs activity for the nine months ended September 30, 2019, is presented as follows (in millions, except per share amounts):
| Shares |  | Weighted Average Grant Date Fair Value
Unvested balance at December 31, 2018 | 2.0 |  |  | $ | 295.70 |
Granted | 0.8 |  |  | $ | 541.18 |
Vested | (0.8) |  |  | $ | 255.09 |
Forfeited | (0.1) |  |  | $ | 368.66 |
Unvested balance at September 30, 2019 | 1.9 |  |  | $ | 405.39 |
Summary of Share-Based Compensation Expense | The following table summarizes share-based compensation expense for the three and nine months ended September 30, 2019, and 2018 (in millions):
| Three Months Ended September 30, |  |  |  | Nine Months Ended September 30, |  |
| 2019 |  | 2018 |  | 2019 |  | 2018
Cost of sales - products | $ | 12.4 |  |  | $ | 10.1 |  |  | $ | 34.8 |  |  | $ | 27.2 |
Cost of sales - services | 5.6 |  |  | 4.5 |  |  | 14.9 |  |  | 12.5 |
Total cost of sales | 18.0 |  |  | 14.6 |  |  | 49.7 |  |  | 39.7 |
Selling, general and administrative | 44.7 |  |  | 35.9 |  |  | 124.0 |  |  | 98.1 |
Research and development | 26.6 |  |  | 20.2 |  |  | 74.5 |  |  | 54.4 |
Share-based compensation expense before income taxes | 89.3 |  |  | 70.7 |  |  | 248.2 |  |  | 192.2 |
Income tax benefit | 18.1 |  |  | 14.9 |  |  | 51.0 |  |  | 40.0 |
Share-based compensation expense after income taxes | $ | 71.2 |  |  | $ | 55.8 |  |  | $ | 197.2 |  |  | $ | 152.2 |
Schedule of Estimated Fair Value of the Option Using Black-Scholes Option Pricing Model, Weighted Average Assumptions | The Black-Scholes option pricing model is used to estimate the fair value of stock options granted under the Company’s stock plans and rights to acquire stock granted under the ESPP. The weighted-average estimated fair values of stock options and rights to acquire stock under the ESPP, as well as the weighted-average assumptions used in calculating those fair values, were as follows:
| Three Months Ended September 30, |  |  |  | Nine Months Ended September 30, |  |
| 2019 |  | 2018 |  | 2019 |  | 2018
Stock Options |  |  |  |  |  |  |
Risk-free interest rate | 1.5% |  |  | 2.7% |  |  | 2.0% |  |  | 2.7% |
Expected term (in years) | 3.9 |  | 4.3 |  | 4.1 |  | 4.3
Expected volatility | 30% |  |  | 32% |  |  | 30% |  |  | 33% |
Fair value at grant date | $127.19 |  |  | $159.67 |  |  | $142.22 |  |  | $145.15 |
ESPP |  |  |  |  |  |  |
Risk-free interest rate | 1.9% |  |  | 2.5% |  |  | 2.1% |  |  | 2.1% |
Expected term (in years) | 1.2 |  | 1.3 |  | 1.2 |  | 1.3
Expected volatility | 29% |  |  | 31% |  |  | 29% |  |  | 32% |
Fair value at grant date | $146.48 |  |  | $153.72 |  |  | $148.99 |  |  | $135.84 |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=116856206&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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