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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2025
Share-Based Payment Arrangement [Abstract]  
Schedule of Allocation of Share-based Compensation Costs by Plan
The following table summarizes our stock-based compensation expense recorded within selling, general and administrative expenses for the years ended December 31:
($ in millions)202520242023
Stock option and appreciation rights$9.6 $11.0 $11.3 
Performance share units3.9 2.2 5.9 
Employee stock purchase plan1.2 1.3 1.3 
Deferred compensation plans and restricted share awards9.1 4.2 4.8 
Total stock-based compensation expense$23.8 $18.7 $23.3 
Schedule of Stock Options Activity
The following table summarizes changes in outstanding options:
(in millions, except per share data)Stock OptionsWeighted Average Exercise Price
Options outstanding, January 1, 2025
1.2 $176.37 
Granted0.1 219.70 
Exercised(0.2)75.54 
Forfeited(0.1)309.03 
Options outstanding, December 31, 2025
1.0 $187.07 
Options vested and expected to vest, December 31, 2025
1.0 $186.28 
Options vested and exercisable, December 31, 2025
0.9 $165.95 
Schedule of Nonvested Share Activity
The following table summarizes changes in our outstanding stock-settled PSU awards:
UnitsWeighted Average Fair Value
Non-vested stock-settled PSU awards, January 1, 2025
93,374 $326.56 
Granted at target level59,923 216.80 
Adjustments above/(below) target(18,788)364.76 
Vested and converted(8,351)211.38 
Forfeited(14,897)276.40 
Non-vested stock-settled PSU awards, December 31, 2025
111,261 $265.21 
UnitsWeighted Average Fair Value
Non-vested stock-settled RSU awards, January 1, 2025
18,499 324.50 
Granted64,350 222.01 
Vested and converted(6,308)230.21 
Forfeited(7,900)241.19 
Non-vested stock-settled RSU awards, December 31, 2025
68,641 $238.53