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STOCK-BASED COMPENSATION (Tables)

6 Months Ended

Jun. 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 six months ended June 30, 2019 and 2018 was as follows (in millions):

	Three Months Ended    June 30,								Six Months Ended    June 30,
	2019				2018				2019				2018
Cost of sales	$	3.9			$	2.8			$	7.9			$	5.8
Selling, general, and administrative expenses	14.3				12.7				27.0				24.5
Research and development expenses	4.1				3.7				8.2				7.3
Total stock-based compensation expense	$	22.3			$	19.2			$	43.1			$	37.6

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,
	2019				2018				2019				2018
Average risk-free interest rate	2.3		%		2.9		%		2.3		%		2.9		%
Expected dividend yield	None				None				None				None
Expected volatility	29.7		%		29.0		%		29.6		%		29.1		%
Expected term (years)	5.0				5.0				5.0				5.0
Fair value, per option	$	54.03			$	42.12			$	54.03			$	42.14

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,
	2019				2018				2019				2018
Average risk-free interest rate	2.4		%		1.9		%		2.4		%		1.6		%
Expected dividend yield	None				None				None				None
Expected volatility	31.9		%		32.8		%		32.5		%		32.6		%
Expected term (years)	0.6				0.6				0.6				0.6
Fair value, per share	$	46.73			$	36.94			$	48.43			$	35.49

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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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