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STOCK-BASED COMPENSATION | 3 Months Ended
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Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
STOCK-BASED COMPENSATION | STOCK-BASED COMPENSATION Stock-based compensation expense related to awards issued under the Company's incentive compensation plans for the three months ended March 31, 2019 and 2018 was as follows (in millions):
| Three Months Ended March 31,
| 2019 |  | 2018
Cost of sales | $ | 4.0 |  |  | $ | 3.0 |
Selling, general, and administrative expenses | 12.7 |  |  | 11.8 |
Research and development expenses | 4.1 |  |  | 3.6 |
Total stock-based compensation expense | $ | 20.8 |  |  | $ | 18.4 |
At March 31, 2019, the total remaining compensation cost related to nonvested stock options, restricted stock units, market-based restricted stock units, performance-based restricted stock units, and employee stock purchase plan ("ESPP") subscription awards amounted to $110.4 million, which will be amortized on a straight-line basis over the weighted-average remaining requisite service period of 29 months. Fair Value Disclosures 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,
| 2019 |  | 2018
Average risk-free interest rate | 2.5 | % |  | 2.6 | %
Expected dividend yield | None |  |  | None |
Expected volatility | 29.2 | % |  | 33.2 | %
Expected term (years) | 5.2 |  |  | 4.7 |
Fair value, per option | $ | 54.03 |  |  | $ | 43.45 |
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,
| 2019 |  | 2018
Average risk-free interest rate | 2.4 | % |  | 1.5 | %
Expected dividend yield | None |  |  | None |
Expected volatility | 32.6 | % |  | 32.6 | %
Expected term (years) | 0.6 |  |  | 0.6 |
Fair value, per share | $ | 48.83 |  |  | $ | 35.07 |

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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