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Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2019

Stockholders' Equity Note [Abstract]

Schedule of Stock Option and Restricted Stock Activity

Stock option and restricted stock activity for the Plans was as follows for the three months ended March 31, 2019:

				Options outstanding													Restricted stock outstanding
	Number of shares available for issuance under the Plans			Number of shares outstanding under the Plans			Weighted- average exercise price per share				Weighted- average remaining contractual term (In years)		Aggregate intrinsic value				Number of shares outstanding under the Plans			Weighted- average grant date fair value per share
Balance at December 31, 2018	57.1			1.3			$	14.68			5.0		$	9.1			25.0			$	18.68
Additional shares authorized	21.2			—			—										—			—
Stock options assumed	0.9			0.9			6.02										—			—
Options exercised and RSUs released	—			(0.2	)		5.15										(2.6	)		17.42
Options and RSUs canceled	1.5			—			—										(1.5	)		17.19
Shares repurchased for tax withholdings on release of restricted stock	1.0			—			—										—			17.42
Restricted stock and options granted	(2.5	)		0.2			22.63										2.3			23.79
Balance at March 31, 2019	79.2			2.2			$	12.45			5.1		$	21.7			23.2			$	19.44
Vested at March 31, 2019				1.1			$	15.71			5.1		$	7.7			—			$	—
Unvested at March 31, 2019				1.1			$	9.22					$	14.0			23.2			$	19.44

Schedule of Pre-Tax Intrinsic Value

The following table summarizes information about the pre-tax intrinsic value of options exercised during the three months ended March 31, 2019 and 2018:

	Three months ended March 31,
	2019				2018
Intrinsic value of options exercised	$	3.1			$	1.7

Fair Value of Stock Options Assumptions Used

The fair value of stock options assumed were estimated using the following assumptions:

Expected volatility	51.6	%
Expected term (in years)	3.4 - 7.0
Risk-free interest rate	2.42% - 2.51%
Dividend yield	—	%

X

- Definition

Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate.

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Tabular disclosure for share-based compensation plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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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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