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Stock Plans (Tables)

12 Months Ended

Dec. 31, 2024

Stock Plans

Schedule of stock options activity

		Number of Shares			Weighted Average Exercise Price				Weighted Average Remaining Contractual Term (years)		Aggregate Intrinsic Value (millions)
Balance at December 31, 2023 (2,211,566 shares exercisable)		5,118,992			$	103.65
Granted		562,785			$	104.28
Exercised		(258,606	)		$	105.05
Forfeited/Canceled		(260,118	)		$	135.60
Expired		(1,389	)		$	149.99
Balance at December 31, 2024		5,161,664			$	104.10			6.3		$	33.8
Exercisable at December 31, 2024		3,740,436			$	106.25			5.3		$	25.1
Vested and expected to vest at December 31, 2024		5,047,966			$	103.61			6.5		$	26.7

Schedule of the fair value using the Black-Scholes-Merton option-pricing model or Monte Carlo simulation model

		Year ended December 31,
		2024				2023				2022
Volatility		42.36		%		42.5		%		42.4		%
Risk-free interest rate - weighted average		4.09		%		4.23		%		3.97		%
Risk-free interest rate - range		4.09% to 4.31%				4.23		%		3.97% to 3.45		%
Dividend yield		—		%		—		%		—		%
Assumed forfeitures		8.0		%		8.0		%		8.0		%
Expected lives		5.0 years				5.0 years				4.6 years
Weighted-average fair value (per option)		$	43.42			$	39.43			$	37.15

Schedule of restricted stock activity

		Number of Shares			Weighted Average Grant Date Fair Value Per Share
Nonvested at December 31, 2023		766,702			$	104.65
Granted		322,899			$	105.08
Vested		177,101			$	116.53
Forfeited		83,145			$	135.07
Nonvested at December 31, 2024		829,355			$	97.11

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Tabular disclosure of the changes in outstanding nonvested restricted stock shares.

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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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