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Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2022

Share-Based Payment Arrangement [Abstract]

Schedule of Employee Stock Purchase Plan

Following is information regarding our 2009 ESPP:

Year Ended December 31,						2022
Shares purchased pursuant to 2009 ESPP						157,507
Weighted average per share price of shares purchased						$	218.59
Weighted average per share discount from market value for shares purchased						$	38.57
As of December 31,						2022
Shares available for purchase pursuant to 2009 ESPP						1,151,846

Schedule of Restricted Stock Units Activity

RSU grants vest over a period of time up to four years from the date of grant. RSU activity was as follows:

			RSUs						Weighted average per share grant date fair value
Balance, December 31, 2021			466,860						$	159.85
Granted			138,420						294.32
Vested			(147,441)						110.77
Forfeited			(41,961)						164.88
Balance, December 31, 2022			415,878						224.00

Schedule of Stock-Based Compensation

Certain information regarding our stock-based compensation was as follows:

Year Ended December 31,						2022						2021						2020
Per share intrinsic value of non-vested stock granted						$	294.32					$	312.83					$	130.89
Weighted average per share discount for compensation expense recognized under the 2009 ESPP						38.57						50.58						22.97
Fair value of non-vested stock that vested during the period ($ in millions)						110.8						107.5						108.5
Stock-based compensation recognized in Consolidated Statements of Operations, as a component of selling, general and administrative expense ($ in millions)						41.1						34.7						23.2
Tax benefit recognized in Consolidated Statements of Operations ($ in millions)						12.4						11.9						3.7
Cash received from options exercised and shares purchased under all share-based arrangements ($ in millions)						34.4						29.6						14.8
Tax deduction realized related to stock options exercised ($ in millions)						43.7						41.8						13.6

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