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STOCK-BASED COMPENSATION (Tables) | 9 Months Ended
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Sep. 30, 2019
Share-based Payment Arrangement [Abstract] |
Schedule of Stock-Based Compensation Expense | Stock-based compensation expense related to awards issued under the Company's incentive compensation plans for the three and nine months ended September 30, 2019 and 2018 was as follows (in millions):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
Cost of sales | $ | 3.6 |  |  | $ | 2.7 |  |  | $ | 11.5 |  |  | $ | 8.5 |
Selling, general, and administrative expenses | 12.4 |  |  | 11.9 |  |  | 39.4 |  |  | 36.4 |
Research and development expenses | 3.8 |  |  | 2.8 |  |  | 12.0 |  |  | 10.1 |
Total stock-based compensation expense | $ | 19.8 |  |  | $ | 17.4 |  |  | $ | 62.9 |  |  | $ | 55.0 |
Schedule of Weighted-Average Assumptions for Options Granted | The following table includes the weighted-average grant-date fair values of stock options granted during the periods indicated and the related weighted-average assumptions used in the Black-Scholes option pricing model:
Option Awards | Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
Average risk-free interest rate | 1.8 | % |  | 2.8 | % |  | 2.3 | % |  | 2.9 | %
Expected dividend yield | None |  |  | None |  |  | None |  |  | None |
Expected volatility | 29.7 | % |  | 29.2 | % |  | 29.6 | % |  | 29.1 | %
Expected term (years) | 5.2 |  |  | 5.2 |  |  | 5.1 |  |  | 5.0 |
Fair value, per option | $ | 58.07 |  |  | $ | 46.37 |  |  | $ | 54.31 |  |  | $ | 42.44 |
Schedule of Weighted-Average Assumptions for ESPP Subscriptions Granted | The following table includes the weighted-average grant-date fair values for ESPP subscriptions granted during the periods indicated and the related weighted-average assumptions used in the Black-Scholes option pricing model:
ESPP | Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
Average risk-free interest rate | 2.0 | % |  | 2.2 | % |  | 2.4 | % |  | 1.7 | %
Expected dividend yield | None |  |  | None |  |  | None |  |  | None |
Expected volatility | 32.0 | % |  | 34.3 | % |  | 32.4 | % |  | 32.8 | %
Expected term (years) | 0.7 |  |  | 0.7 |  |  | 0.6 |  |  | 0.6 |
Fair value, per share | $ | 57.31 |  |  | $ | 46.58 |  |  | $ | 49.29 |  |  | $ | 36.53 |

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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