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Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2021

Share-based Payment Arrangement [Abstract]

Stock Option Activity

The following table summarizes the Company’s stock option activity and related information for the 2011 Plan, the 2000 Plan and the Directors Plan for the three months ended March 31, 2021:

			Options						Weighted Average Exercise Price						Weighted Average Remaining Contractual Life						Aggregate Intrinsic value (in millions)
Outstanding at December 31, 2020			552,669						$	69.82					6.1						$	4.2
Granted			126,794						$	81.21
Exercised			(10,128)						$	40.28
Canceled			(12,422)						$	71.87
Outstanding at March 31, 2021			656,913						$	72.15					6.6						$	5.6
Exercisable at March 31, 2021			406,953						$	57.82					6.0						$	5.2

Share-Based Fair Value of Each Option Grant Weighted-Average Assumptions

The fair value of each option grant is estimated on the date of grant using the Black-Scholes option pricing model with the following weighted-average assumptions:

			Three Months Ended March 31, 2021
Dividend yield			0.60		%
Risk-free interest rate			0.81		%
Stock price volatility			36.1		%
Expected life (years)			5.0

Restricted Stock Activity and Incentive Stock Awards Activity

The following table summarizes the restricted stock activity and incentive stock units activity for the three months ended March 31, 2021:

			Restricted Stock and Units						Incentive Stock Units						Weighted Average Grant Date Fair Value
Outstanding at December 31, 2020			656,006						270,645						$	73.80
Granted			184,646						241,467						81.21
Vested			(260,675)						(37,672)						73.17
Canceled			(15,661)						(7,498)						75.56
Outstanding at March 31, 2021			564,316						466,942						77.00

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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Schedule of Incentive Stock Awards Activity and Restricted Stock Activity [Table Text Block]

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