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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2021
Share-based Payment Arrangement [Abstract] |
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) | 2021 |  | 2020 |  | 2019
Stock option and appreciation rights | $ | 12.5 |  |  | $ | 10.2 |  |  | $ | 9.1 |
Performance share units, stock-settled | 17.6 |  |  | 16.6 |  |  | 9.5 |
Performance share units, cash-settled | 1.0 |  |  | 0.4 |  |  | 0.1 |
Performance share units, dividend equivalents | 0.2 |  |  | 0.6 |  |  | 0.2 |
Employee stock purchase plan | 1.4 |  |  | 1.1 |  |  | 0.9 |
Deferred compensation plans and restricted share awards | 4.8 |  |  | 5.1 |  |  | 4.6 |
Total stock-based compensation expense | $ | 37.5 |  |  | $ | 34.0 |  |  | $ | 24.4 |
Schedule of Stock Options Activity | The following table summarizes changes in outstanding options:
(in millions, except per share data) | 2021 |  | 2020 |  | 2019
Options outstanding, January 1 | 2.4 |  |  | 2.7 |  |  | 3.0 |
Granted | 0.1 |  |  | 0.2 |  |  | 0.3 |
Exercised | (0.5) |  |  | (0.5) |  |  | (0.6) |
Forfeited | — |  |  | — |  |  | — |
Options outstanding, December 31 | 2.0 |  |  | 2.4 |  |  | 2.7 |
Options exercisable, December 31 | 1.5 |  |  | 1.6 |  |  | 1.6 |
Weighted Average Exercise Price | 2021 |  | 2020 |  | 2019
Options outstanding, January 1 | $ | 81.37 |  |  | $ | 67.02 |  |  | $ | 58.93 |
Granted | 280.22 |  |  | 178.11 |  |  | 103.40 |
Exercised | 60.63 |  |  | 49.99 |  |  | 46.42 |
Forfeited | 134.89 |  |  | 103.51 |  |  | 92.71 |
Options outstanding, December 31 | $ | 101.73 |  |  | $ | 81.37 |  |  | $ | 67.02 |
Options exercisable, December 31 | $ | 73.46 |  |  | $ | 62.42 |  |  | $ | 53.12 |
Schedule of Stock Appreciation Rights Award Activity | The following table summarizes changes in outstanding SARs:
| 2021 |  | 2020 |  | 2019
SARs outstanding, January 1 | 27,679 |  |  | 35,993 |  |  | 39,819 |
Granted | 704 |  |  | 3,272 |  |  | 3,364 |
Exercised | (6,029) |  |  | (11,261) |  |  | (6,790) |
Forfeited | (1,300) |  |  | (325) |  |  | (400) |
SARs outstanding, December 31 | 21,054 |  |  | 27,679 |  |  | 35,993 |
SARs exercisable, December 31 | 16,644 |  |  | 27,182 |  |  | 27,781 |
Weighted Average Exercise Price | 2021 |  | 2020 |  | 2019
SARs outstanding, January 1 | $ | 75.43 |  |  | $ | 52.36 |  |  | $ | 46.48 |
Granted | 319.94 |  |  | 190.97 |  |  | 102.51 |
Exercised | 48.62 |  |  | 35.37 |  |  | 42.08 |
Forfeited | 125.36 |  |  | 71.43 |  |  | 63.43 |
SARs outstanding, December 31 | $ | 88.18 |  |  | $ | 75.43 |  |  | $ | 52.36 |
SARs exercisable, December 31 | $ | 64.61 |  |  | $ | 40.23 |  |  | $ | 40.73 |
Schedule of Nonvested Performance-based Share Activity | The following table summarizes changes in our outstanding stock-settled PSU awards:
| 2021 |  | 2020 |  | 2019
Non-vested stock-settled PSU awards, January 1 | 222,799 |  |  | 264,622 |  |  | 296,037 |
Granted at target level | 37,701 |  |  | 53,659 |  |  | 84,309 |
Adjustments above/(below) target | 50,965 |  |  | (14,004) |  |  | (50,556) |
Vested and converted | (143,465) |  |  | (70,074) |  |  | (48,964) |
Forfeited | (3,526) |  |  | (11,404) |  |  | (16,204) |
Non-vested stock-settled PSU awards, December 31 | 164,474 |  |  | 222,799 |  |  | 264,622 |
Weighted Average Fair Value | 2021 |  | 2020 |  | 2019
Non-vested stock-settled PSU awards, January 1 | $ | 116.37 |  |  | $ | 92.80 |  |  | $ | 76.84 |
Granted at target level | 333.58 |  |  | 177.31 |  |  | 103.40 |
Adjustments above/(below) target | 93.38 |  |  | 77.02 |  |  | 83.89 |
Vested and converted | 272.65 |  |  | 173.22 |  |  | 102.51 |
Forfeited | 152.30 |  |  | 104.43 |  |  | 69.09 |
Non-vested stock-settled PSU awards, December 31 | $ | 179.88 |  |  | $ | 116.37 |  |  | $ | 92.80 |
Schedule of Nonvested Performance-based Units Activity | The following table summarizes changes in our outstanding cash-settled PSU awards:
| 2021 |  | 2020 |  | 2019
Non-vested cash-settled PSU awards, January 1 | 2,112 |  |  | 1,981 |  |  | 1,592 |
Granted at target level | 163 |  |  | 732 |  |  | 806 |
Adjustments above/(below) target | 311 |  |  | (99) |  |  | (206) |
Vested and converted | (877) |  |  | (502) |  |  | (211) |
Forfeited | (391) |  |  | — |  |  | — |
Non-vested cash-settled PSU awards, December 31 | 1,318 |  |  | 2,112 |  |  | 1,981 |
Weighted Average Fair Value | 2021 |  | 2020 |  | 2019
Non-vested cash-settled PSU awards, January 1 | $ | 130.13 |  |  | $ | 93.28 |  |  | $ | 79.48 |
Granted at target level | 320.12 |  |  | 190.71 |  |  | 102.51 |
Adjustments above/(below) target | 91.40 |  |  | 74.43 |  |  | 56.95 |
Vested and converted | 274.29 |  |  | 173.22 |  |  | 102.51 |
Forfeited | 135.64 |  |  | — |  |  | — |
Non-vested cash-settled PSU awards, December 31 | $ | 169.53 |  |  | $ | 130.13 |  |  | $ | 93.28 |

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