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Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2013

A summary of our stock option activity, and related information for the year ended December 31, 2013 is as follows (in millions except weighted-average exercise price and weighted-average remaining contractual term):



	Number of Shares		Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (years)	Aggregate Intrinsic Value
Outstanding at December 31, 2012	7.4		$	7.67
Exercised	(1.5	)	6.64
Forfeited	—		8.18
Outstanding at December 31, 2013	5.9		$	7.94	4.3	$	160.3
Exercisable at December 31, 2013	5.8		$	7.91	4.3	$	159.1

Schedule of Intrinsic Value of Options Exercised and Fair Value of Options Vested

The total intrinsic value of options exercised as of the date of exercise and total fair value of options vested was as follows (in millions):



	Years Ended December 31,
	2013		2012		2011
Intrinsic value of options exercised	$	29.8	$	2.7	$	3.0
Fair value of options vested	$	1.3	$	3.7	$	5.7

Schedule of Nonvested Stock Option Activity

The following table sets forth a summary of our nonvested stock options and activity as of and for the year ended December 31, 2013:



	Shares		Weighted Average Grant Date Fair Value
	(in millions)
Nonvested at December 31, 2012	0.3		$	5.52
Vested	(0.2	)	5.95
Forfeited	—		5.00
Nonvested at December 31, 2013	0.1		$	4.60

Schedule of Share-Based Compensation Expenses

The following table summarizes share-based compensation expense related to employee stock options, restricted stock units and employee stock purchases for the years ended December 31, 2013, 2012 and 2011 were allocated as follows (in millions):



	Years Ended December 31,
	2013		2012		2011
Cost of sales	$	2.6	$	2.1	$	1.4
Research and development	8.5		6.2		4.6
Selling, general and administrative	13.5		10.1		7.5
Share-based compensation expense included in operating expenses	$	24.6	$	18.4	$	13.5

Schedule of Valuation Assumptions for Each Option Grant and Employee Stock Purchase Plan Purchase Rights

We estimated the fair value of each option grant and ESPP purchase rights on the date of grant using the Black-Scholes option pricing model with the below assumptions.

Options:



	Years Ended December 31,
	2013	2012		2011
Risk free interest rate	n/a	1.2	%	1.5 – 2.5
Dividend yield	n/a	—	%	—	%
Expected volatility of the Company’s stock	n/a	0.70		0.68 – 0.69
Expected life (in years)	n/a	6.1		6.1

Estimate of Fair Value of ESPP

ESPP:



	Years Ended December 31,
	2013		2012		2011
Risk free interest rate	0.13 – 0.17		0.11 – 0.19		0.21 – 0.26
Dividend yield	—	%	—	%	—	%
Expected volatility of the Company’s stock	0.30 – 0.39		0.39 – 0.70		0.31 – 0.49
Expected life (in years)	1		1		1

Schedule of Restricted Stock Units Activity

The following table sets forth a summary of our RSU activity as of and for the year ended December 31, 2013 (in millions except weighted average grant date fair value):



	Shares		Weighted Average Grant Date Fair Value		Aggregate Intrinsic Value
Nonvested at December 31, 2012	3.0		$	11.60
Granted	2.4		17.29
Vested	(1.5	)	11.97
Forfeited	(0.3	)	12.60
Nonvested at December 31, 2013	3.6		$	15.13	$	126.9

Schedule of Stock Options Reserved for Future Issuance

Reserved Shares

We have reserved shares of common stock for future issuance as follows (in millions):



	December 31,
	2013	2012
Stock options and awards under our plans:
Stock options granted and outstanding	5.9	7.4
Unvested RSUs	3.6	3.0
Reserved for future grant	0.5	0.5
Employee Stock Purchase Plan	2.6	2.1
Total	12.6	13.0