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Stock-Based Compensation (Tables) | 12 Months Ended
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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) | 2024 |  | 2023 |  | 2022
Stock option and appreciation rights | $ | 11.0 |  |  | $ | 11.3 |  |  | $ | 5.6 |
Performance share units | 2.2 |  |  | 5.9 |  |  | 15.6 |
Employee stock purchase plan | 1.3 |  |  | 1.3 |  |  | 1.3 |
Deferred compensation plans and restricted share awards | 4.2 |  |  | 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 Options |  | Weighted Average Exercise Price
Options outstanding, January 1, 2024 | 1.4 |  |  | $ | 145.40 |
Granted | 0.1 |  |  | 348.25 |
Exercised | (0.3) |  |  | 77.88 |
Forfeited | 0.0 |  |  | 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:
| Units |  | Weighted Average Fair Value
Non-vested stock-settled PSU awards, January 1, 2024 | 98,441 |  |  | $ | 334.03 |
Granted at target level | 34,484 |  |  | 348.20 |
Adjustments above/(below) target | 2,523 |  |  | 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 |

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