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Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2025
Share-Based Payment Arrangement [Abstract]  
Schedule of Valuation Assumptions
Following are the assumptions used by the Company to value the original awards:

 Years Ended December 31,
 202520242023
Fair value per option grant$154.07 $133.91 $88.53 
Assumptions   
Dividend yield0.4%0.4%0.5%
Expected volatility27.9%32.9%33.1%
Risk-free interest rate4.5%4.3%3.8%
Expected life (years)4.84.84.9
Stock price at valuation date$492.22 $391.54 $263.48 
Schedule of Changes in Stock Options Outstanding
Changes in options outstanding for Company employees during the period from December 31, 2024 to December 31, 2025 are presented in the following table:
OptionsNumber of SharesWeighted-Average Exercise PriceWeighted-Average Remaining Contractual
Term (Years)		Aggregate Intrinsic Value (Millions of Dollars)
Outstanding at December 31, 2024259,750 $180.68 
Granted 28,900 $492.22 
Exercised(36,200)$99.28 
Forfeited(7,350)$410.81 
Outstanding at December 31, 2025245,100 $222.54 3.1$46.7 
Exercisable at December 31, 2025172,790 $148.96 2.2$44.0 
Schedule of Additional Stock Option Information
Additional information about stock options outstanding at December 31, 2025 is shown below:

 Options OutstandingOptions Exercisable
Range of Exercise Prices per OptionNo. of OptionsAvg. Life Remaining in YearsNo. of OptionsAvg. Life Remaining in Years
$0.00to$99.998,600 0.28,600 0.2
$100.00to$149.9998,140 1.698,140 1.6
$150.00to$249.9947,900 3.047,900 3.0
$250.00to$349.9934,550 3.917,750 3.7
$350.00to$449.9929,710 5.1400 1.2
$450.00&Above26,200 6.1— —
 245,100 3.1172,790 2.2
Schedule of Restricted Stock Unit Activity
Changes in RSUs outstanding during the period from December 31, 2024 to December 31, 2025 are presented in the following table:

RSUsNumber of UnitsWeighted-Average Grant Date Fair ValueTotal Fair Value (Millions of Dollars)
Outstanding at December 31, 202498,214 $285.60 
Granted29,467 $462.80 
Vested and issued(38,968)$212.35 $17.9 
Forfeited(6,798)$386.91 
Outstanding at December 31, 202581,915 $376.60 $33.1 
Changes in PSUs outstanding for Company employees during the period from December 31, 2024 to December 31, 2025 are presented in the following table:

Employee PSUsNumber of UnitsWeighted-Average Grant Date Fair ValueTotal Fair Value (Millions of Dollars)
Outstanding at December 31, 202477,395 $320.05 
Granted49,371 $583.25 
Vested and issued(61,288)$221.39 $29.7 
Forfeited(5,874)$466.58 
Outstanding at December 31, 202559,604 $438.28 $24.1 
Changes in Director RSUs outstanding for Company non-employee directors during the period from December 31, 2024 to December 31, 2025 are presented in the following table:

2013 Plan — Director RSUsNumber of UnitsWeighted-Average Grant Date Fair ValueTotal Fair Value (Millions of Dollars)
Outstanding at December 31, 20249,436 $196.38 
Granted 12 $406.93 
Vested and issued(7,174)$175.84 $3.5 
Outstanding at December 31, 20252,274 $261.51 $0.9 
Schedule of Amounts Recognized in Financial Statements with Respect to Share-Based Plans
Amounts recognized in the financial statements by the Company with respect to all share-based compensation plans are shown in the following table:
 
 Years Ended December 31,
(Millions of dollars)202520242023
Compensation charged against income before income tax benefit$28.6 $22.9 $21.8 
Related income tax benefit recognized in income$6.0 $4.8 $4.6