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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2020
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) | 2020 |  | 2019 |  | 2018
Stock option and appreciation rights | $ | 10.2 |  |  | $ | 9.1 |  |  | $ | 8.6 |
Performance share units, stock-settled | 16.6 |  |  | 9.5 |  |  | 2.5 |
Performance share units, cash-settled | 0.4 |  |  | 0.1 |  |  | — |
Performance share units, dividend equivalents | 0.6 |  |  | 0.2 |  |  | 0.1 |
Employee stock purchase plan | 1.1 |  |  | 0.9 |  |  | 0.9 |
Deferred compensation plans and restricted share awards | 5.1 |  |  | 4.6 |  |  | 3.0 |
Total stock-based compensation expense | $ | 34.0 |  |  | $ | 24.4 |  |  | $ | 15.1 |
Schedule of Stock Options Activity | The following table summarizes changes in outstanding options:
(in millions, except per share data) | 2020 |  | 2019 |  | 2018
Options outstanding, January 1 | 2.7 |  |  | 3.0 |  |  | 3.5 |
Granted | 0.2 |  |  | 0.3 |  |  | 0.5 |
Exercised | (0.5) |  |  | (0.6) |  |  | (1.0) |
Forfeited | — |  |  | — |  |  | — |
Options outstanding, December 31 | 2.4 |  |  | 2.7 |  |  | 3.0 |
Options exercisable, December 31 | 1.6 |  |  | 1.6 |  |  | 1.7 |
Weighted Average Exercise Price | 2020 |  | 2019 |  | 2018
Options outstanding, January 1 | $ | 67.02 |  |  | $ | 58.93 |  |  | $ | 48.76 |
Granted | 178.11 |  |  | 103.40 |  |  | 90.36 |
Exercised | 49.99 |  |  | 46.42 |  |  | 35.95 |
Forfeited | 103.51 |  |  | 92.71 |  |  | 75.32 |
Options outstanding, December 31 | $ | 81.37 |  |  | $ | 67.02 |  |  | $ | 58.93 |
Options exercisable, December 31 | $ | 62.42 |  |  | $ | 53.12 |  |  | $ | 45.32 |
Schedule of Stock Appreciation Rights Award Activity | The following table summarizes changes in outstanding SARs:
| 2020 |  | 2019 |  | 2018
SARs outstanding, January 1 | 35,993 |  |  | 39,819 |  |  | 51,368 |
Granted | 3,272 |  |  | 3,364 |  |  | 3,480 |
Exercised | (11,261) |  |  | (6,790) |  |  | (14,629) |
Forfeited | (325) |  |  | (400) |  |  | (400) |
SARs outstanding, December 31 | 27,679 |  |  | 35,993 |  |  | 39,819 |
SARs exercisable, December 31 | 27,182 |  |  | 27,781 |  |  | 30,285 |
Weighted Average Exercise Price | 2020 |  | 2019 |  | 2018
SARs outstanding, January 1 | $ | 52.36 |  |  | $ | 46.48 |  |  | $ | 38.55 |
Granted | 190.97 |  |  | 102.51 |  |  | 89.64 |
Exercised | 35.37 |  |  | 42.08 |  |  | 28.45 |
Forfeited | 71.43 |  |  | 63.43 |  |  | 63.43 |
SARs outstanding, December 31 | $ | 75.43 |  |  | $ | 52.36 |  |  | $ | 46.48 |
SARs exercisable, December 31 | $ | 40.23 |  |  | $ | 40.73 |  |  | $ | 36.91 |
Schedule of Nonvested Performance-based Share Activity | The following table summarizes changes in our outstanding stock-settled PSU awards:
| 2020 |  | 2019 |  | 2018
Non-vested stock-settled PSU awards, January 1 | 264,622 |  |  | 296,037 |  |  | 341,944 |
Granted at target level | 53,659 |  |  | 84,309 |  |  | 102,307 |
Adjustments above/(below) target | (14,004) |  |  | (50,556) |  |  | (2,284) |
Vested and converted | (70,074) |  |  | (48,964) |  |  | (121,984) |
Forfeited | (11,404) |  |  | (16,204) |  |  | (23,946) |
Non-vested stock-settled PSU awards, December 31 | 222,799 |  |  | 264,622 |  |  | 296,037 |
Weighted Average Grant Date Fair Value | 2020 |  | 2019 |  | 2018
Non-vested stock-settled PSU awards, January 1 | $ | 92.80 |  |  | $ | 76.84 |  |  | $ | 64.38 |
Granted at target level | 177.31 |  |  | 103.40 |  |  | 90.45 |
Adjustments above/(below) target | 77.02 |  |  | 83.89 |  |  | 33.86 |
Vested and converted | 173.22 |  |  | 102.51 |  |  | 93.00 |
Forfeited | 104.43 |  |  | 69.09 |  |  | 68.65 |
Non-vested stock-settled PSU awards, December 31 | $ | 116.37 |  |  | $ | 92.80 |  |  | $ | 76.84 |
Schedule of Nonvested Performance-based Units Activity | The following table summarizes changes in our outstanding cash-settled PSU awards:
| 2020 |  | 2019 |  | 2018
Non-vested cash-settled PSU awards, January 1 | 1,981 |  |  | 1,592 |  |  | 1,972 |
Granted at target level | 732 |  |  | 806 |  |  | 560 |
Adjustments above/(below) target | (99) |  |  | (206) |  |  | (30) |
Vested and converted | (502) |  |  | (211) |  |  | (910) |
Forfeited | — |  |  | — |  |  | — |
Non-vested cash-settled PSU awards, December 31 | 2,112 |  |  | 1,981 |  |  | 1,592 |
Weighted Average Grant Date Fair Value | 2020 |  | 2019 |  | 2018
Non-vested cash-settled PSU awards, January 1 | $ | 93.28 |  |  | $ | 79.48 |  |  | $ | 92.25 |
Granted at target level | 190.71 |  |  | 102.51 |  |  | 89.64 |
Adjustments above/(below) target | 74.43 |  |  | 56.95 |  |  | 41.53 |
Vested and converted | 173.22 |  |  | 102.51 |  |  | 93.00 |
Forfeited | — |  |  | — |  |  | — |
Non-vested cash-settled PSU awards, December 31 | $ | 130.13 |  |  | $ | 93.28 |  |  | $ | 79.48 |

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