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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [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) | 2017 |  | 2016 |  | 2015
Stock option and appreciation rights | $ | 7.8 |  |  | $ | 8.6 |  |  | $ | 9.2 |
Performance share units, stock-settled | 4.1 |  |  | 6.7 |  |  | 6.0 |
Performance share units, cash-settled | 0.1 |  |  | 0.1 |  |  | 0.7 |
Performance share units, dividend equivalents | 0.1 |  |  | 0.2 |  |  | 0.2 |
Employee stock purchase plan | 0.8 |  |  | 0.7 |  |  | 0.6 |
Deferred compensation plans | 3.2 |  |  | 3.2 |  |  | 2.5 |
Total stock-based compensation expense | $ | 16.1 |  |  | $ | 19.5 |  |  | $ | 19.2 |
Schedule of Stock Options Activity | The following table summarizes changes in outstanding options:
(in millions, except per share data) | 2017 |  | 2016 |  | 2015
Options outstanding, January 1 | 4.5 |  |  | 5.0 |  |  | 4.6 |
Granted | 0.5 |  |  | 0.7 |  |  | 0.9 |
Exercised | (1.5 | ) |  | (1.1 | ) |  | (0.5 | )
Forfeited | — |  |  | (0.1 | ) |  | — |
Options outstanding, December 31 | 3.5 |  |  | 4.5 |  |  | 5.0 |
Options exercisable, December 31 | 1.9 |  |  | 2.7 |  |  | 2.9 |
Weighted Average Exercise Price | 2017 |  | 2016 |  | 2015
Options outstanding, January 1 | $ | 38.11 |  |  | $ | 31.77 |  |  | $ | 25.49 |
Granted | 84.09 |  |  | 61.98 |  |  | 56.06 |
Exercised | 26.15 |  |  | 22.50 |  |  | 21.85 |
Forfeited | 60.92 |  |  | 45.91 |  |  | — |
Options outstanding, December 31 | $ | 48.76 |  |  | $ | 38.11 |  |  | $ | 31.77 |
Options exercisable, December 31 | $ | 35.44 |  |  | $ | 27.17 |  |  | $ | 22.75 |
Schedule of Stock Appreciation Rights Award Activity | The following table summarizes changes in outstanding SARs:
| 2017 |  | 2016 |  | 2015
SARs outstanding, January 1 | 116,087 |  |  | 232,930 |  |  | 297,714 |
Granted | 2,792 |  |  | 3,368 |  |  | 12,356 |
Exercised | (67,511 | ) |  | (114,976 | ) |  | (77,140 | )
Forfeited | — |  |  | (5,235 | ) |  | — |
SARs outstanding, December 31 | 51,368 |  |  | 116,087 |  |  | 232,930 |
SARs exercisable, December 31 | 39,769 |  |  | 71,701 |  |  | 112,295 |
Weighted Average Exercise Price | 2017 |  | 2016 |  | 2015
SARs outstanding, January 1 | $ | 31.13 |  |  | $ | 27.79 |  |  | $ | 25.20 |
Granted | 83.47 |  |  | 68.40 |  |  | 57.25 |
Exercised | 27.65 |  |  | 24.95 |  |  | 22.52 |
Forfeited | — |  |  | 42.28 |  |  | — |
SARs outstanding, December 31 | $ | 38.55 |  |  | $ | 31.13 |  |  | $ | 27.79 |
SARs exercisable, December 31 | $ | 30.77 |  |  | $ | 26.65 |  |  | $ | 24.60 |
Schedule of Nonvested Performance-based Share Activity | The following table summarizes changes in our outstanding stock-settled PSU awards:
| 2017 |  | 2016 |  | 2015
Non-vested stock-settled PSU awards, January 1 | 378,062 |  |  | 422,726 |  |  | 470,719 |
Granted at target level | 92,045 |  |  | 115,035 |  |  | 147,908 |
Adjustments above/(below) target | (11,369 | ) |  | 19,339 |  |  | 132,444 |
Vested and converted | (116,684 | ) |  | (173,364 | ) |  | (318,337 | )
Forfeited | (110 | ) |  | (5,674 | ) |  | (10,008 | )
Non-vested stock-settled PSU awards, December 31 | 341,944 |  |  | 378,062 |  |  | 422,726 |
Weighted Average Grant Date Fair Value | 2017 |  | 2016 |  | 2015
Non-vested stock-settled PSU awards, January 1 | $ | 54.47 |  |  | $ | 45.60 |  |  | $ | 30.93 |
Granted at target level | 84.01 |  |  | 60.47 |  |  | 55.49 |
Adjustments above/(below) target | 42.85 |  |  | 38.71 |  |  | 22.97 |
Vested and converted | 50.06 |  |  | 59.64 |  |  | 51.53 |
Forfeited | 73.64 |  |  | 49.86 |  |  | 41.84 |
Non-vested stock-settled PSU awards, December 31 | $ | 64.38 |  |  | $ | 54.47 |  |  | $ | 45.60 |
Schedule of Nonvested Performance-based Units Activity | The following table summarizes changes in our outstanding cash-settled PSU awards:
| 2017 |  | 2016 |  | 2015
Non-vested cash-settled PSU awards, January 1 | 2,451 |  |  | 29,196 |  |  | 55,509 |
Granted at target level | 598 |  |  | 419 |  |  | 1,386 |
Adjustments above/(below) target | (107 | ) |  | 2,858 |  |  | 19,315 |
Vested and converted | (970 | ) |  | (29,032 | ) |  | (47,014 | )
Forfeited | — |  |  | (990 | ) |  | — |
Non-vested cash-settled PSU awards, December 31 | 1,972 |  |  | 2,451 |  |  | 29,196 |
Weighted Average Grant Date Fair Value | 2017 |  | 2016 |  | 2015
Non-vested cash-settled PSU awards, January 1 | $ | 25.28 |  |  | $ | 32.07 |  |  | $ | 26.15 |
Granted at target level | 83.47 |  |  | 59.64 |  |  | 54.14 |
Adjustments above/(below) target | 66.61 |  |  | 30.80 |  |  | 22.07 |
Vested and converted | 86.93 |  |  | 59.64 |  |  | 51.53 |
Forfeited | — |  |  | 50.55 |  |  | — |
Non-vested cash-settled PSU awards, December 31 | $ | 92.25 |  |  | $ | 25.28 |  |  | $ | 32.07 |

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