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STOCK-BASED COMPENSATION (Tables)

3 Months Ended

Mar. 31, 2019

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 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

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    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

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    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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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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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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