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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2022
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) | 2022 |  | 2021 |  | 2020
Stock option and appreciation rights | $ | 5.6 |  |  | $ | 12.5 |  |  | $ | 10.2 |
Performance share units, stock-settled | 15.6 |  |  | 17.6 |  |  | 16.6 |
Performance share units, cash-settled | (0.1) |  |  | 1.0 |  |  | 0.4 |
Performance share units, dividend equivalents | 0.1 |  |  | 0.2 |  |  | 0.6 |
Employee stock purchase plan | 1.3 |  |  | 1.4 |  |  | 1.1 |
Deferred compensation plans and restricted share awards | 1.2 |  |  | 4.8 |  |  | 5.1 |
Total stock-based compensation expense | $ | 23.7 |  |  | $ | 37.5 |  |  | $ | 34.0 |
Schedule of Stock Options Activity | The following table summarizes changes in outstanding options:
(in millions, except per share data) | 2022
Options outstanding, January 1 | 2.0 |
Granted | 0.1 |
Exercised | (0.2) |
Forfeited | 0.0 |
Options outstanding, December 31 | 1.9 |
Options vested and expected to vest, December 31 | 1.9 |
Options vested and exercisable, December 31 | 1.5 |
Weighted Average Exercise Price | 2022
Options outstanding, January 1 | $ | 101.73 |
Granted | 364.47 |
Exercised | 83.77 |
Forfeited | 224.26 |
Options outstanding, December 31 | $ | 118.72 |
Options vested and expected to vest, December 31 | $ | 116.88 |
Options vested and exercisable, December 31 | $ | 84.11 |
Schedule of Stock Appreciation Rights Award Activity | The following table summarizes changes in outstanding SARs:
| 2022
SARs outstanding, January 1 | 21,054 |
Granted | 520 |
Exercised | (1,169) |
Forfeited | (3) |
SARs outstanding, December 31 | 20,402 |
SARs vested and expected to vest, December 31 | 20,402 |
SARs vested and exercisable, December 31 | 17,450 |
Weighted Average Exercise Price | 2022
SARs outstanding, January 1 | $ | 88.18 |
Granted | 369.13 |
Exercised | 54.64 |
Forfeited | 21.22 |
SARs outstanding, December 31 | $ | 97.28 |
SARs vested and expected to vest, December 31 | $ | 97.28 |
SARs vested and exercisable, December 31 | $ | 74.86 |
Schedule of Nonvested Performance-based Share Activity | The following table summarizes changes in our outstanding stock-settled PSU awards:
| 2022
Non-vested stock-settled PSU awards, January 1 | 164,474 |
Granted at target level | 32,109 |
Adjustments above/(below) target | 68,426 |
Vested and converted | (144,490) |
Forfeited | (7,966) |
Non-vested stock-settled PSU awards, December 31 | 112,553 |
Weighted Average Fair Value | 2022
Non-vested stock-settled PSU awards, January 1 | $ | 179.88 |
Granted at target level | 362.40 |
Adjustments above/(below) target | 106.57 |
Vested and converted | 369.13 |
Forfeited | 240.19 |
Non-vested stock-settled PSU awards, December 31 | $ | 278.38 |
Schedule of Nonvested Performance-based Units Activity | The following table summarizes changes in our outstanding cash-settled PSU awards:
| 2022
Non-vested cash-settled PSU awards, January 1 | 1,318 |
Granted at target level | 136 |
Adjustments above/(below) target | 507 |
Vested and converted | (1,071) |
Forfeited | — |
Non-vested cash-settled PSU awards, December 31 | 890 |
Weighted Average Fair Value | 2022
Non-vested cash-settled PSU awards, January 1 | $ | 169.53 |
Granted at target level | 369.13 |
Adjustments above/(below) target | 104.44 |
Vested and converted | 369.13 |
Forfeited | — |
Non-vested cash-settled PSU awards, December 31 | $ | 242.29 |

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