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Incentive Plans (Tables)
9 Months Ended
Sep. 30, 2023
Share-Based Payment Arrangement [Abstract]  
Schedule Valuation Assumptions
Assumptions used to value awards:
Dividend yield0.53 %
Expected volatility33.1 %
Risk-free interest rate3.8 %
Expected life (years)4.9
Stock price at valuation date$263.48
Schedule of Changes in Stock Options Outstanding
Changes in options outstanding for Company employees during the period from December 31, 2022 to September 30, 2023 are presented in the following table:

2013 Plan — Options Number of SharesWeighted Average Exercise PriceWeighted Average Remaining Contractual Term (Years)Aggregate Intrinsic Value (Millions of Dollars)
Outstanding at December 31, 2022313,950 $112.06 
Granted38,100 $263.48 
Exercised(54,450)$76.08 
Outstanding at September 30, 2023297,600 $138.02 4.1$60.6 
Exercisable at September 30, 2023167,100 $97.47 3.1$40.8 
Schedule of Stock Unit Activity
Changes in restricted stock units outstanding for Company employees during the period from December 31, 2022 to September 30, 2023 are presented in the following table:

2013 Plan — Employee RSUs Number of unitsWeighted Average Grant Date Fair ValueTotal Fair Value (Millions of Dollars)
Outstanding at December 31, 2022149,366 $125.51 
Granted34,600 $256.84 
Vested and issued(60,735)$80.07 $16.0 
Forfeited(2,642)$176.19 
Outstanding at September 30, 2023120,589 $198.08 $41.2 
Changes in performance-based restricted stock units outstanding for Company employees during the period from December 31, 2022 to September 30, 2023 are presented in the following table:

2013 Plan — Employee PSUsNumber of UnitsWeighted Average Grant Date Fair ValueTotal Fair Value (Millions of Dollars)
Outstanding at December 31, 2022106,001 $160.03 
Granted62,275 $292.52 
Vested and issued(72,799)$121.83 $19.0 
Outstanding at September 30, 202395,477 $218.97 $32.6 
Changes in restricted stock units outstanding for Company non-employee directors during the period from December 31, 2022 to September 30, 2023 are presented in the following table:

2013 Plan — Director RSUs and DSUs Number of UnitsWeighted Average Grant Date Fair ValueTotal Fair Value (Millions of Dollars)
Outstanding at December 31, 202226,923 $132.38 
Granted6,584 $258.35 
Vested and issued(9,880)$110.19 $2.7 
Outstanding at September 30, 2023, including DSUs
23,627 $177.98 $8.1 
Changes in restricted stock units outstanding for Company 2023 Plan during the period from December 31, 2022 to September 30, 2023 are presented in the following table:

2023 Plan — RSUs and Director DSUs Number of UnitsWeighted Average Grant Date Fair ValueTotal Fair Value (Millions of Dollars)
Outstanding at December 31, 2022— $— 
Granted
692
$325.32 
Vested and issued
0
$— $— 
Outstanding at September 30, 2023, including DSUs
692 $325.32 $0.2