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Share-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Summary of Performance-Based Stock Option Activity

Performance-based stock option activity under the 2007 SIP, the 2013 SIP, and the 2018 EIP was as follows:

 

 

 

Shares

 

 

Weighted

Average

Exercise

Price

(per share)

 

 

Weighted

Average

Remaining

Contractual

Term

(in years)

 

 

Aggregate

Intrinsic Value

(in millions)

 

Performance-based options outstanding at December 31,

   2020

 

 

1,844,279

 

 

$

64.55

 

 

 

9.2

 

 

$

77.5

 

Granted

 

 

 

 

 

 

 

 

 

 

 

 

Exercised

 

 

(2,500

)

 

 

(13.46

)

 

 

 

 

 

 

Forfeited or expired

 

 

 

 

 

 

 

 

 

 

 

 

Performance-based options outstanding at March 31,

   2021

 

 

1,841,779

 

 

$

64.62

 

 

 

9.0

 

 

$

36.2

 

Performance-based options exercisable at March 31,

   2021

 

 

23,051

 

 

$

13.81

 

 

 

1.4

 

 

$

1.6

 

Summary of Term-Based Stock Option Activity

Term-based stock option activity under the 2007 SIP, the 2013 SIP, and the 2018 EIP was as follows:

 

 

 

Shares

 

 

Weighted

Average

Exercise

Price

(per share)

 

 

Weighted

Average

Remaining

Contractual

Term

(in years)

 

 

Aggregate

Intrinsic Value

(in millions)

 

Term-based options outstanding at December 31, 2020

 

 

10,983,074

 

 

$

40.47

 

 

 

7.8

 

 

$

725.9

 

Granted

 

 

399,388

 

 

 

80.95

 

 

 

 

 

 

 

Exercised

 

 

(273,516

)

 

 

(28.82

)

 

 

 

 

 

 

Forfeited or expired

 

 

(30,061

)

 

 

(51.12

)

 

 

 

 

 

 

Term-based options outstanding at March 31, 2021

 

 

11,078,885

 

 

$

42.19

 

 

 

7.7

 

 

$

466.4

 

Term-based options exercisable at March 31, 2021

 

 

4,227,029

 

 

$

32.90

 

 

 

7.0

 

 

$

217.0

 

Summary of Restricted Stock Units Activity

RSU activity under the 2013 SIP and the 2018 EIP was as follows:

 

 

 

Shares

 

RSUs outstanding at December 31, 2020

 

 

1,389,385

 

Granted

 

 

720,854

 

Shares issued upon vesting of RSUs

 

 

(27,207

)

Forfeited or canceled

 

 

(3,166

)

RSUs outstanding at March 31, 2021

 

 

2,079,866

 

RSUs releasable at March 31, 2021

 

 

556,892

 

Summary of Performance Stock Units

PSU activity under the 2018 EIP was as follows:

 

 

Shares

 

PSUs outstanding at December 31, 2020

 

 

135,220

 

Granted

 

 

336,214

 

Shares issued upon vesting of PSUs

 

 

 

Forfeited or canceled

 

 

(135,313

)

PSUs outstanding at March 31, 2021

 

 

336,121

 

PSUs releasable at March 31, 2021

 

 

 

Summary of Global Employee Stock Purchase Plan Activity

Our GESPP activity was as follows: 

 

Period Ended

 

Shares Issued

 

 

Purchase Price

(per share)

 

March 31, 2021

 

 

39,484

 

 

$

71.63