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Stock-Based Compensation (Tables) | 12 Months Ended
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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) | 2025 |  | 2024 |  | 2023
Stock option and appreciation rights | $ | 9.6 |  |  | $ | 11.0 |  |  | $ | 11.3 |
Performance share units | 3.9 |  |  | 2.2 |  |  | 5.9 |
Employee stock purchase plan | 1.2 |  |  | 1.3 |  |  | 1.3 |
Deferred compensation plans and restricted share awards | 9.1 |  |  | 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 Options |  | Weighted Average Exercise Price
Options outstanding, January 1, 2025 | 1.2 |  |  | $ | 176.37 |
Granted | 0.1 |  |  | 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:
| Units |  | Weighted Average Fair Value
Non-vested stock-settled PSU awards, January 1, 2025 | 93,374 |  |  | $ | 326.56 |
Granted at target level | 59,923 |  |  | 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 |
| Units |  | Weighted Average Fair Value
Non-vested stock-settled RSU awards, January 1, 2025 | 18,499 |  |  | 324.50 |
Granted | 64,350 |  |  | 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 |

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