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STOCK-BASED COMPENSATION (Tables)

6 Months Ended

Jun. 30, 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 and six months ended June 30, 2020 and 2019 was as follows (in millions):

	Three Months Ended    June 30,								Six Months Ended    June 30,
	2020				2019				2020				2019
Cost of sales	$	4.7			$	3.9			$	9.3			$	7.9
Selling, general, and administrative expenses	15.3				14.3				29.7				27.0
Research and development expenses	4.8				4.1				9.7				8.2
Total stock-based compensation expense	$	24.8			$	22.3			$	48.7			$	43.1

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    June 30,								Six Months Ended    June 30,
	2020				2019				2020				2019
Average risk-free interest rate	0.3		%		2.3		%		0.3		%		2.3		%
Expected dividend yield	None				None				None				None
Expected volatility	33.5		%		29.7		%		33.4		%		29.6		%
Expected term (years)	5.0				5.0				5.0				5.0
Fair value, per option	$	21.58			$	18.01			$	21.61			$	18.01

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    June 30,								Six Months Ended    June 30,
	2020				2019				2020				2019
Average risk-free interest rate	0.1		%		2.4		%		1.4		%		2.4		%
Expected dividend yield	None				None				None				None
Expected volatility	37.5		%		31.9		%		32.6		%		26.6		%
Expected term (years)	0.6				0.6				0.6				0.6
Fair value, per share	$	18.42			$	15.58			$	16.06			$	16.14

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Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

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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.

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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.

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