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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation, Stock Options, Activity
The following table summarizes the Company’s stock option activity and related information as of and for the three years ended December 31, 2015 (in millions, except for per share amounts and years):
 
Outstanding Options
 
Number of Shares
 
Weighted Average
Exercise Price
per Share
 
Weighted Average
Remaining
Contractual Term
(In Years)
 
Aggregate
Intrinsic
Value
Balance as of December 31, 2012
34.1

 
$
24.13

 
3.1
 
$
52.5

Canceled
(1.3
)
 
29.56

 
 
 
 
Exercised
(5.6
)
 
15.58

 
 
 
 
Expired
(4.1
)
 
28.35

 
 
 
 
Balance as of December 31, 2013
23.1

 
$
25.15

 
2.4
 
$
44.6

Canceled
(0.6
)
 
30.15

 
 
 
 
Exercised
(5.4
)
 
19.76

 
 
 
 
Expired
(7.2
)
 
29.11

 
 
 
 
Balance as of December 31, 2014
9.9

 
$
24.87

 
2.0
 
$
24.7

Canceled
(0.1
)
 
23.65

 
 
 
 
Exercised
(3.5
)
 
19.78

 
 
 
 
Expired
(2.7
)
 
27.99

 
 
 
 
Balance as of December 31, 2015
3.6

 
$
27.52

 
2.1
 
$
16.6

 
 
 
 
 
 
 
 
As of December 31, 2015:
 
 
 
 
 
 
 
Vested and expected-to-vest options
3.6

 
$
27.58

 
2.1
 
$
16.3

Exercisable options
3.4

 
$
28.82

 
1.8
 
$
12.1
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range
The following table summarizes additional information regarding outstanding and exercisable options as of December 31, 2015:
 
 
Options Outstanding 
 
Options Exercisable 
Range of Exercise Price
(In dollars)
 
Number
Outstanding
(In millions)
 
Weighted Average
Remaining
Contractual Life
(In years)
 
Weighted Average
Exercise Price
(In dollars)
 
Number
Exercisable
(In millions)
 
Weighted Average
Exercise Price
(In dollars)
$0.03 - $14.68
 
0.4

 
5.3
 
$
3.38

 
0.3

 
$
4.94

$15.09 - $18.45
 
0.4

 
0.7
 
15.58

 
0.3

 
15.47

$18.49 - $26.10
 
0.4

 
2.3
 
24.11

 
0.3

 
24.19

$26.39 - $27.44
 
0.5

 
1.0
 
26.97

 
0.5

 
26.97

$27.62 - $29.33
 
0.1

 
2.0
 
28.88

 
0.1

 
28.88

$29.89 - $29.89
 
0.5

 
1.2
 
29.89

 
0.5

 
29.89

$30.01 - $36.49
 
0.4

 
1.9
 
32.76

 
0.4

 
32.76

$38.93 - $38.93
 
0.1

 
2.4
 
38.93

 
0.1

 
38.93

$40.26 - $40.26
 
0.5

 
2.2
 
40.26

 
0.6

 
40.26

$44.00 - $44.00
 
0.3

 
2.1
 
44.00

 
0.3

 
44.00

$0.03 - $44.00
 
3.6

 
2.1
 
$
27.52

 
3.4

 
$
28.82
Schedule of Nonvested Share Activity
The following table summarizes the Company’s RSU, RSA, and PSA activity and related information as of and for the three years ended December 31, 2015 (in millions, except per share amounts and years):
 
Outstanding RSUs, RSAs, and PSAs
 
Number of Shares
 
Weighted Average
Grant-Date Fair
Value per Share
 
Weighted Average
Remaining
Contractual Term
(In Years)
 
Aggregate
Intrinsic
Value
Balance as of December 31, 2012
26.8

 
$
27.76

 
1.7
 
$
565.0

RSUs granted
10.3

 
20.32

 
 
 
 
PSAs granted(1)
2.2

 
21.27

 
 
 
 
RSUs vested(2)
(6.1
)
 
26.15

 
 
 
 
PSAs vested(2)
(1.1
)
 
28.52

 
 
 
 
RSAs vested(2)
(1.6
)
 
19.59

 
 
 
 
RSUs canceled
(3.4
)
 
22.99

 
 
 
 
PSAs canceled
(1.7
)
 
29.10

 
 
 
 
Balance as of December 31, 2013
25.4

 
$
23.44

 
1.1
 
$
573.5

RSUs granted(3)(6)
10.0

 
22.52

 
 
 
 
RSUs assumed(4)
0.4

 
22.66

 
 
 
 
RSAs assumed(4)
0.9

 
22.66

 
 
 
 
PSAs granted(5)(6)
1.4

 
24.25

 
 
 
 
PSAs assumed(4)
0.2

 
22.66

 
 
 
 
RSUs vested(2)
(7.3
)
 
22.98

 
 
 
 
RSAs vested(2)
(1.4
)
 
19.59

 
 
 
 
PSAs vested(2)
(1.1
)
 
36.19

 
 
 
 
RSUs canceled
(4.0
)
 
21.63

 
 
 
 
PSAs canceled
(3.2
)
 
30.43

 
 
 
 
Balance as of December 31, 2014
21.3

 
$
22.05

 
1.1
 
$
475.0

RSUs granted(3)(6)
8.9

 
23.41

 
 
 
 
PSAs granted(6)(7)
1.0

 
23.76

 
 
 
 
RSUs vested(2)
(7.2
)
 
22.58

 
 
 
 
RSAs vested(2)
(1.8
)
 
20.13

 
 
 
 
PSAs vested(2)
(0.3
)
 
22.52

 
 
 
 
RSUs canceled
(2.3
)
 
22.18

 
 
 
 
PSAs canceled
(1.0
)
 
22.27

 
 
 
 
Balance at December 31, 2015
18.6

 
$
22.71

 
1.1
 
$
514.1

 
 
 
 
 
 
 
 
As of December 31, 2015
 
 
 
 
 
 
 
Vested and expected-to-vest RSUs, RSAs,
   and PSAs
15.3

 
$
22.59

 
1.0
 
$
421.3

________________________________
(1) 
The number of shares subject to PSAs granted represents the aggregate maximum number of shares that may be issued pursuant to the award over its full term. The aggregate number of shares subject to these PSAs that would be issued if performance goals determined by the Compensation Committee (or an authorized subcommittee) are achieved at target is 1.1 million shares. Depending on achievement of such performance goals, the range of shares that could be issued under these awards is 0 to 2.2 million shares.
(2) 
Total fair value of RSUs, RSAs, and PSAs vested during 2015, 2014, and 2013 was $202.7 million, $238.5 million, and $221.5 million, respectively.
(3) 
Includes service-based and market-based RSUs granted under the 2006 Plan and 2015 Plan according to their terms.
(4) 
RSUs, RSAs, and PSAs assumed in connection with the acquisition of WANDL Inc.
(5) 
The number of shares subject to PSAs granted represents the aggregate maximum number of shares that may be issued pursuant to the award over its full term. The aggregate number of shares subject to these PSAs that would be issued if performance goals determined by the Compensation Committee (or an authorized subcommittee) are achieved at target is 0.7 million shares. Depending on achievement of such performance goals, the range of shares that could be issued under these awards is 0 to 1.4 million shares.
(6) 
On February 20, 2014, the Company announced its intention to initiate a quarterly cash dividend of $0.10 per share of common stock in the third quarter of 2014. As a result of the Company's announcement, the grant date fair value of RSUs and PSAs granted after the announcement date were reduced by the present value of the dividends expected to be paid on the underlying shares of common stock during the requisite and derived service period as these awards are not entitled to receive dividends until vested.
(7) 
The number of shares subject to PSAs granted represents the aggregate maximum number of shares that may be issued pursuant to the award over its full term. The aggregate number of shares subject to these PSAs that would be issued if performance goals determined by the Compensation Committee (or an authorized subcommittee) are achieved at target is 0.7 million shares. Depending on achievement of such performance goals, the range of shares that could be issued under these awards is 0 to 1.0 million shares.
Shares available for grant
The following table presents the stock activity and the total number of shares available for grant under the 2015 Plan and the 2006 Plan, as applicable:
 
Number of Shares
Balance as of December 31, 2014
47.8

RSUs and PSAs granted (1)
(20.7
)
RSUs and PSAs canceled (1)(2)
7.0

Options canceled (2)
0.1

Options expired (2)
2.7

Shares discontinued (3) 
(38.2
)
Shares authorized under the 2015 Plan
38.0

Balance as of December 31, 2015
36.7

________________________________
(1) 
RSUs and PSAs with a per share or unit purchase price lower than 100% of the fair market value of the Company's common stock on the day of the grant under the 2015 Plan and the 2006 Plan are counted against shares authorized under the plan as two and one-tenth shares of common stock for each share subject to such award. The number of shares subject to PSAs granted represents the maximum number of shares that may be issued pursuant to the award over its full term.
(2) 
Canceled or expired options under the 2006 Plan and the 1996 Plan and canceled RSUs and PSAs under the 2006 Plan are no longer available for future grant under such plans; however, the number of shares available for grant under the 2015 Plan will be increased by the amount of such canceled or expired options, RSUs or PSAs, as applicable, up to a maximum of 29.0 million additional shares of common stock, pursuant to the terms of the 2015 Plan.
(3) 
Authorized shares not subject to outstanding awards under the 2006 Plan were canceled on May 19, 2015, following the approval by the Company’s stockholders of the 2015 Plan. Effective May 19, 2015, no additional awards are issuable under the 2006 Plan.
Schedule Of Share-based Payment Award, Stock Options and Employee Stock Purchase Plan, Valuation Assumptions
The weighted-average assumptions used and the resulting estimates of fair value for stock options, ESPP, and market-based RSUs were as follows:
 
Years Ended December 31,
 
2015
 
2014
 
2013
ESPP(1):
 
 
 
 
 
Volatility
29%
 
30%
 
36%
Risk-free interest rate
0.1%
 
0.1%
 
0.1%
Expected life (years)
0.5
 
0.5
 
0.5
Dividend yield
1.7%
 
0% - 1.8%
 
—
Weighted-average fair value per share
$5.63
 
$5.72
 
$5.54
 
 
 
 
 
 
Market-based RSUs(2)
 
 
 
 
 
Volatility
34%
 
36%
 
—
Risk-free interest rate
1.4%
 
1.6%
 
—
Dividend yield
1.8%
 
0% - 2.0%
 
—
Weighted-average fair value per share
$14.97
 
$16.89
 
—
________________________________
(1) 
The Black-Scholes-Merton option-pricing model is utilized to estimate the fair value of ESPP.
(2) 
The fair value of market-based RSUs utilizes the Monte Carlo simulation option pricing model. The Company amortizes the fair value of these awards over the derived service period adjusted for estimated forfeitures for each separately vesting tranche of the award. Provided that the derived service is rendered, the total fair value of the market-based RSUs at the date of grant is recognized as compensation expense even if the market condition is not achieved. However, the number of shares that ultimately vest can vary significantly with the performance of the specified market criteria.
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs
Share-based compensation expense associated with stock options, RSUs, RSAs, PSAs, and ESPP was recorded in the following cost and expense categories in the Company's Consolidated Statements of Operations (in millions):
 
Years Ended December 31,
 
2015
 
2014
 
2013
Cost of revenues - Product
$
5.6

 
$
5.0

 
$
4.7

Cost of revenues - Service
13.8

 
14.2

 
15.4

Research and development
125.4

 
134.5

 
127.6

Sales and marketing
45.6

 
60.2

 
70.9

General and administrative
26.9

 
26.1

 
26.0

Total
$
217.3

 
$
240.0

 
$
244.6
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award

The following table summarizes share-based compensation expense by award type (in millions):
 
Years Ended December 31,
 
2015
 
2014
 
2013
Stock options
$
6.6

 
$
14.9

 
$
31.5

RSUs, RSAs, and PSAs
197.3

 
209.7

 
196.8

ESPP
13.4

 
15.4

 
16.3

Total
$
217.3

 
$
240.0

 
$
244.6
Schedule of Unrecognized Compensation Cost, Nonvested Awards
The following table presents unrecognized compensation cost, adjusted for estimated forfeitures, recognized over a weighted-average period related to unvested stock options, RSUs, RSAs, and PSAs as of December 31, 2015 (in millions, except years):
 
Unrecognized
Compensation Cost
 
Weighted Average
Period
(In Years)
Stock options
$
2.1

 
0.6
RSUs, RSAs, and PSAs
$
211.2

 
1.7