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STOCK-BASED COMPENSATION (Tables)

9 Months Ended

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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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.

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-Name Accounting Standards Codification
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-Section 50
-Paragraph 2
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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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