Stock Plans (Tables)

12 Months Ended

Dec. 31, 2020

Share-based Payment Arrangement [Abstract]

Schedule of Share-based Compensation, Restricted Stock Units Award Activity

Aggregated information regarding the Company’s RSUs and PBRSUs is summarized below:

	All Restricted Stock Units
	Units (000)		Wtd. Average Fair Value (per share)
Outstanding December 31, 2017	1,294		$	45.32
Granted	782	(a)	60.80
Vested	(670)		45.11
Surrendered	(64)		47.05
Outstanding December 31, 2018	1,342		52.56
Granted	994	(b)	57.49
Vested	(744)		42.42
Surrendered	(47)		57.72
Outstanding December 31, 2019, Unvested	1,545		57.65
Granted	1,235	(c)	56.89
Vested	(715)		54.70
Surrendered	(103)		58.04
Outstanding December 31, 2020, Unvested	1,962		57.81

(a) Includes 308 thousand PBRSUs

(b) Includes 387 thousand PBRSUs

(c) Includes 519 thousand PBRSUs

Schedule of Share-based Compensation, Employee Stock Purchase Plan, Activity

The following table provides information about the Company’s ESPP activity during 2020, 2019, and 2018:

Employee Stock Purchase Plan
				(a)
	Total number			Weighted-average
	of shares	Average		fair value of each
	purchased	price paid		purchase right
Year ended	(in thousands)	per share		under the ESPP
December 31, 2018	661	$	50.73	$	5.64
December 31, 2019	821	$	47.60	$	5.29
December 31, 2020	1,386	$	34.39	$	3.82

(a) The weighted-average fair value of each purchase right under the ESPP granted is equal to a ten percent discount from the market value of the Common Stock at the end of each monthly purchase period.