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STOCK-BASED COMPENSATION (Tables) | 9 Months Ended
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Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [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, 2018 and 2017 was as follows (in millions):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Cost of sales | $ | 2.7 |  |  | $ | 2.4 |  |  | $ | 8.5 |  |  | $ | 7.0 |
Selling, general, and administrative expenses | 11.9 |  |  | 10.3 |  |  | 36.4 |  |  | 30.5 |
Research and development expenses | 2.8 |  |  | 3.1 |  |  | 10.1 |  |  | 8.8 |
Total stock-based compensation expense | $ | 17.4 |  |  | $ | 15.8 |  |  | $ | 55.0 |  |  | $ | 46.3 |
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,
| 2018 |  | 2017 |  | 2018 |  | 2017
Average risk-free interest rate | 2.8 | % |  | 1.8 | % |  | 2.9 | % |  | 1.8 | %
Expected dividend yield | None |  |  | None |  |  | None |  |  | None |
Expected volatility | 29.2 | % |  | 33.2 | % |  | 29.1 | % |  | 33.0 | %
Expected term (years) | 5.2 |  |  | 4.7 |  |  | 5.0 |  |  | 4.6 |
Fair value, per option | $ | 46.37 |  |  | $ | 36.26 |  |  | $ | 42.44 |  |  | $ | 33.74 |
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,
| 2018 |  | 2017 |  | 2018 |  | 2017
Average risk-free interest rate | 1.2 | % |  | 0.7 | % |  | 0.9 | % |  | 0.5 | %
Expected dividend yield | None |  |  | None |  |  | None |  |  | None |
Expected volatility | 34.3 | % |  | 34.3 | % |  | 32.8 | % |  | 33.1 | %
Expected term (years) | 0.7 |  |  | 0.7 |  |  | 0.6 |  |  | 0.6 |
Fair value, per share | $ | 46.58 |  |  | $ | 29.15 |  |  | $ | 36.53 |  |  | $ | 25.69 |

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 + Details
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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=109197908&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=109197908&loc=d3e5070-113901 + Details
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