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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2019
Share-based Payment Arrangement [Abstract]  
Schedule of stock option activity and related information
The following table summarizes the Company’s stock option activity and related information as of and for the nine months ended September 30, 2019 (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, 2018
0.1

 
$
20.66

 
 
 
 
Assumed upon the acquisition of Mist
1.1

 
5.05

 
 
 
 
Exercised
(0.1
)
 
16.45

 
 
 
 
Expired/Canceled
(0.1
)
 
6.55

 
 
 
 
Balance as of September 30, 2019
1.0

 
$
4.95

 
8.2
 
$
19.6

 
 
 
 
 
 
 
 
As of September 30, 2019:
 
 
 
 
 
 
 
Vested and expected-to-vest options
1.0

 
$
4.95

 
8.2
 
$
19.6

Exercisable options
0.2

 
$
4.09

 
7.7
 
$
3.5
Schedule of nonvested share activity
The Company’s RSU and PSA activity and related information as of and for the nine months ended September 30, 2019 were as follows (in millions, except per share amounts and years):
 
Outstanding RSUs, RSAs and PSAs(4)
 
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, 2018
17.4

 
$
25.32

 
 
 
 
RSUs granted (1)(3)
7.3

 
25.36

 
 
 
 
RSUs assumed upon the acquisition of Mist
0.1

 
25.81

 
 
 
 
RSAs assumed upon the acquisition of Mist
0.7

 
27.20

 
 
 
 
PSAs granted (2)(3)
1.5

 
25.06

 
 
 
 
RSUs vested
(4.7
)
 
25.93

 
 
 
 
RSAs vested
(0.1
)
 
23.10

 
 
 
 
PSAs vested
(0.5
)
 
26.77

 
 
 
 
RSUs canceled
(2.0
)
 
26.03

 
 
 
 
PSAs canceled
(0.9
)
 
23.64

 
 
 
 
Balance as of September 30, 2019
18.8

 
$
25.20

 
1.2
 
$
465.9

________________________________
(1) 
Includes service-based and market-based RSUs. The number of shares subject to market-based condition 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 market-based conditions that would be issued if market criteria are achieved at target is 0.2 million shares. Depending on achievement of such market criteria, the range of shares that could be issued under these awards is zero to 0.4 million shares.
(2) 
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 are achieved at target is 0.4 million shares. Depending on achievement of such performance goals, the range of shares that could be issued under these awards is zero to 0.7 million shares.
(3) 
The grant date fair value of RSUs and PSAs was reduced by the present value of 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. During the nine months ended September 30, 2019, the Company declared a quarterly cash dividend of $0.19 per share of common stock on January 29, 2019, April 25, 2019 and July 25, 2019.
(4) 
1.5 million shares of PSAs were modified during the nine months ended September 30, 2019, which relate to PSAs granted in 2018 and PSAs assumed by the Company in connection with acquisitions consummated in 2016. Compensation cost resulting from the modifications totaled $30.2 million to be recognized over the remaining terms of the modified awards.
Schedule of employee stock purchases through ESPP
The following table summarizes employee stock purchases through the ESPP (in millions, except per share amounts):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2019
 
2018
 
2019
 
2018
Shares purchased
1.2

 
1.2

 
2.4

 
2.5

Average exercise price per share
$
22.03

 
$
22.39

 
$
22.04

 
$
22.31
Schedule of employee service share-based compensation, allocation of recognized period costs
Share-based compensation expense associated with stock options, RSUs, RSAs, PSAs, and the ESPP was recorded in the following cost and expense categories in the Condensed Consolidated Statements of Operations (in millions):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2019
 
2018
 
2019
 
2018
Cost of revenues - Product
$
0.8

 
$
1.5

 
$
4.3

 
$
5.1

Cost of revenues - Service
4.1

 
4.5

 
13.0

 
14.2

Research and development
29.6

 
28.1

 
68.0

 
101.8

Sales and marketing
15.5

 
12.9

 
40.0

 
40.4

General and administrative
7.5

 
6.2

 
21.8

 
18.7

Total
$
57.5

 
$
53.2

 
$
147.1

 
$
180.2
Disclosure of share-based compensation arrangements by share-based payment award
The following table summarizes share-based compensation expense by award type (in millions):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2019
 
2018
 
2019
 
2018
Stock options
$
2.3

 
$
0.1

 
$
5.6

 
$
0.3

RSUs, RSAs, and PSAs
50.9

 
48.2

 
127.7

 
165.8

ESPP
4.3

 
4.9

 
13.8

 
14.1

Total
$
57.5

 
$
53.2

 
$
147.1

 
$
180.2