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STOCK-BASED COMPENSATION (Tables) | 3 Months Ended
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Mar. 31, 2020
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 months ended March 31, 2020 and 2019 was as follows (in millions):
| Three Months Ended March 31,
| 2020 |  | 2019
Cost of sales | $ | 4.6 |  |  | $ | 4.0 |
Selling, general, and administrative expenses | 14.4 |  |  | 12.7 |
Research and development expenses | 4.9 |  |  | 4.1 |
Total stock-based compensation expense | $ | 23.9 |  |  | $ | 20.8 |
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 March 31,
| 2020 |  | 2019
Average risk-free interest rate | 1.4 | % |  | 2.5 | %
Expected dividend yield | None |  |  | None |
Expected volatility | 29.7 | % |  | 29.2 | %
Expected term (years) | 5.2 |  |  | 5.2 |
Fair value, per option | $ | 68.36 |  |  | $ | 54.03 |
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 March 31,
| 2020 |  | 2019
Average risk-free interest rate | 1.6 | % |  | 2.4 | %
Expected dividend yield | None |  |  | None |
Expected volatility | 31.9 | % |  | 25.3 | %
Expected term (years) | 0.6 |  |  | 0.6 |
Fair value, per share | $ | 47.14 |  |  | $ | 48.83 |

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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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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (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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