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Stock-based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2025

Share-Based Payment Arrangement [Abstract]

Summary of Stock Option Plan Activity

Information on the Company’s stock options is summarized below.

YEARS ENDED DECEMBER 31		2025								2024								2023
(in whole shares and dollars)		Shares				Weighted Average Exercise Price				Shares				Weighted Average Exercise Price				Shares				Weighted Average Exercise Price
Outstanding, beginning of year			1,111,871			$	117.43				1,137,042			$	111.57				1,080,852			$	107.07
Granted			140,393				161.82				150,731				134.26				135,019				140.01
Exercised			(155,280	)			96.49				(173,260	)			93.37				(56,645	)			88.10
Forfeited or cancelled			(2,522	)			149.73				(2,642	)			134.99				(22,184	)			125.15
Outstanding, end of year			1,094,462			$	126.02				1,111,871			$	117.43				1,137,042			$	111.57
Exercisable, end of year			812,847			$	118.14				830,549			$	110.85				864,186			$	104.16

Schedule of Stock Options by Exercise Price Range

Additional information about employee options outstanding and exercisable at December 31, 2025 is included in the following table:

			Options Outstanding												Options Currently Exercisable
Range of Exercise Prices			Number				Weighted Average Remaining Contractual Lives				Weighted Average Exercise Price				Number				Weighted Average Exercise Price
$	77.91 to $85.87			75,212				0.92			$	84.03				75,212			$	84.03
$	104.11			127,350				2.16				104.11				127,350				104.11
$	115.35			125,002				5.16				115.35				125,002				115.35
$	117.22 to $118.54			254,869				3.78				118.03				254,869				118.03
$	134.26 to $139.51			254,887				7.29				136.56				155,481				138.03
$	140.01 to $161.82			257,142				8.24				151.80				74,933				140.01

Schedule of Stock Option Valuation Assumptions

The following significant assumptions were used to determine the fair value for options granted in the years indicated.

		2025					2024					2023
Dividend yield		2.225			%			2.532		%			2.314		%
Expected volatility		22.561% to 25.494			%		23.571% to 30.041			%		24.429% to 28.803			%
Weighted average expected volatility			23.76		%			26.32		%			26.05		%
Risk-free interest rate		4.092% to 4.229			%		4.202% to 4.571			%		4.008% to 4.613			%
Expected term, in years		2.5 to 7.5					2.5 to 7.0					2.5 to 7.0

Summary of Restricted Stock Activity

The following table summarizes information about employee restricted stock units:

YEARS ENDED DECEMBER 31		2025								2024								2023
		Shares				Weighted Average Grant Date Fair Value				Shares				Weighted Average Grant Date Fair Value				Shares				Weighted Average Grant Date Fair Value
Time-based restricted stock units:
Outstanding, beginning of year			386,712			$	137.44				376,626			$	132.04				378,256			$	124.88
Granted			137,914				160.41				160,751				133.58				155,645				137.59
Vested			(124,748	)			139.80				(127,147	)			116.81				(136,971	)			118.70
Forfeited			(17,934	)			144.97				(23,518	)			136.04				(20,304	)			131.30
Outstanding, end of year			381,944			$	144.61				386,712			$	137.44				376,626			$	132.04
Performance and market-based restricted    stock units:
Outstanding, beginning of year			126,211			$	140.47				120,504			$	132.76				119,163			$	122.81
Granted			52,360				178.39				53,336				132.27				50,115				137.90
Vested			(31,052	)			141.58				(41,290	)			112.36				(44,781	)			114.14
Forfeited			(14,369	)			152.88				(6,339	)			108.06				(3,993	)			109.19
Outstanding, end of year			133,150			$	153.78				126,211			$	140.47				120,504			$	132.76

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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 of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms.

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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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