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Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2021

Share-based Payment Arrangement [Abstract]

Schedule Of Restricted Stock Units

The following is a summary of RSU activity during the year ended December 31, 2021:

(In thousands except per share data)			Units						Weighted-Average Grant-Date Fair Value
Unvested at January 1, 2021			472						$	145.77
Granted			229						194.41
Vested, including 55 shares withheld for tax1			(175)						139.08
Forfeited			(41)						169.13
Unvested at December 31, 2021			485						$	169.19

1 The Company withholds shares of common stock to pay the minimum required statutory taxes due upon RSU vesting. Cash is then remitted by the Company to the appropriate taxing authorities.

Schedule Of Assumptions Used, Options

The key inputs for the fair values and other relevant information by grant date are outlined below:

Grant date			3/15/2021						6/24/2020						6/24/20202						3/16/20203						3/20/20193
Risk-free interest rate			0.29%						0.21%						0.21%						0.20%						0.18%
Stock price1			$226.02						$160.14						$160.14						$173.15						$173.15
Expected stock price volatility			53.65%						47.72%						47.72%						51.32%						62.29%
Weighted-average fair value per share1			$238.92						$264.17						$240.55						$280.93						$188.21

1 At the date of grant or modification date, whichever is applicable.

2 CEO-only award; Has a one-year post-vesting holding period.

3 Awards modified on June 23, 2020.

The fair value of option awards is estimated on the grant date using the Black-Scholes-Merton option-pricing model utilizing the assumptions included in the following table:

			2021						2020						2019
Weighted average grant date fair value			$	92.82					$	35.13					$	58.28
Weighted average expected term (in years)			6						6						6
Weighted average exercise price			$	226.02					$	109.66					$	184.81
Expected stock price volatility			41.81		%				32.37		%				27.21		%
Risk-free interest rate			1.05		%				0.58		%				2.37		%

Schedule Of Performance Based Restricted Stock Units

The following is a summary of PBRSU activity during the year ended December 31, 2021:

(In thousands except per share data)			Shares																		Weighted-Average Grant-Date Fair Value
Unvested at January 1, 2021			582																		$	170.05
Granted			148																		236.44
Forfeited			(56)																		219.29
Vested, including 54 shares withheld for tax1			(150)																		157.55
Performance adjustment2, 3			33																		NM
Unvested at December 31, 20213			557																		$	230.01

NM - Not meaningful

1 The Company withholds shares of common stock to pay the minimum required statutory taxes due upon PBRSU vesting. Cash is then remitted by the Company to the appropriate taxing authorities.

2 Reflects adjustments to the number of shares of PBRSUs expected to vest based on the change in estimated performance attainments during the year ended December 31, 2021.

3 The impact on awards as a result of expected market condition attainments is not reflected in this table until the attainment measurement period concludes.

Schedule Of Stock Option Activity

The following is a summary of all stock option activity during the year ended December 31, 2021: 

(In thousands, except per share data)			Shares						Weighted-Average Exercise Price						Weighted-Average Remaining Contractual Term (in years)						Aggregate Intrinsic Value
Outstanding at January 1, 2021			1,043						$	115.72
Granted			119						226.02
Exercised			(432)						102.40
Forfeited or expired			(26)						147.28
Outstanding at December 31, 2021			704						$	141.42					7.1						$	14,850
Exercisable on December 31, 2021			399						$	125.95					6.1						$	10,036
Vested and expected to vest at December 31, 2021			300						$	161.14					8.5						$	4,768

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Tabular disclosure of the changes in outstanding nonvested performance-based units.

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Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

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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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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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