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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2024
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)202420232022
Stock option and appreciation rights$11.0 $11.3 $5.6 
Performance share units2.2 5.9 15.6 
Employee stock purchase plan1.3 1.3 1.3 
Deferred compensation plans and restricted share awards4.2 4.8 1.2 
Total stock-based compensation expense$18.7 $23.3 $23.7 
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, 2024
1.4 $145.40 
Granted0.1 348.25 
Exercised(0.3)77.88 
Forfeited0.0 331.97 
Options outstanding, December 31, 2024
1.2 $176.37 
Options vested and expected to vest, December 31, 2024
1.1 $172.07 
Options vested and exercisable, December 31, 2024
0.9 $137.48 
Schedule of Nonvested Performance-based 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, 2024
98,441 $334.03 
Granted at target level34,484 348.20 
Adjustments above/(below) target2,523 339.07 
Vested and converted(35,388)350.18 
Forfeited(6,686)331.62 
Non-vested stock-settled PSU awards, December 31, 2024
93,374 $326.56