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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2015
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) | 2015 | 2014 | 2013
Stock option and appreciation rights | $ | 9.2 |  | $ | 7.6 |  | $ | 7.7 |
Performance-vesting shares | 6.0 |  | 6.5 |  | 6.5 |
Performance-vesting units | 0.7 |  | 1.9 |  | 2.4 |
Performance-vesting shares/units dividend equivalents | 0.2 |  | 0.4 |  | 0.4 |
Employee stock purchase plan | 0.6 |  | 0.5 |  | 0.4 |
Deferred compensation plans | 2.5 |  | 1.7 |  | 3.8 |
Total stock-based compensation expense | $ | 19.2 |  | $ | 18.6 |  | $ | 21.2 |
Schedule of Stock Options Activity | The following table summarizes changes in outstanding options:
(in millions, except per share data) | 2015 |  | 2014 |  | 2013 |
Options outstanding, January 1 | 4.6 |  | 4.8 |  | 5.6 |
Granted | 0.9 |  | 0.7 |  | 0.9 |
Exercised | (0.5 | ) | (0.7 | ) | (1.6 | )
Forfeited | — |  | (0.2 | ) | (0.1 | )
Options outstanding, December 31 | 5.0 |  | 4.6 |  | 4.8 |
Options exercisable, December 31 | 2.9 |  | 2.6 |  | 2.3 |
Weighted Average Exercise Price | 2015 |  | 2014 |  | 2013 |
Options outstanding, January 1 | $ | 25.49 |  | $ | 21.99 |  | $ | 19.83 |
Granted | 56.06 |  | 47.59 |  | 29.71 |
Exercised | 21.85 |  | 20.17 |  | 18.97 |
Forfeited | — |  | 31.42 |  | 23.10 |
Options outstanding, December 31 | $ | 31.77 |  | $ | 25.49 |  | $ | 21.99 |
Options exercisable, December 31 | $ | 22.75 |  | $ | 20.67 |  | $ | 19.51 |
Schedule of Stock Appreciation Rights Award Activity | The following table summarizes changes in outstanding SARs:
| 2015 |  | 2014 |  | 2013 |
SARs outstanding, January 1 | 297,714 |  | 375,104 |  | 389,686 |
Granted | 12,356 |  | 7,733 |  | 132,566 |
Exercised | (77,140 | ) | (85,123 | ) | (147,148 | )
SARs outstanding, December 31 | 232,930 |  | 297,714 |  | 375,104 |
SARs exercisable, December 31 | 112,295 |  | 88,751 |  | 56,938 |
Weighted Average Exercise Price | 2015 |  | 2014 |  | 2013 |
SARs outstanding, January 1 | $ | 25.20 |  | $ | 24.03 |  | $ | 20.81 |
Granted | 57.25 |  | 47.74 |  | 29.56 |
Exercised | 22.52 |  | 22.09 |  | 20.47 |
SARs outstanding, December 31 | $ | 27.79 |  | $ | 25.20 |  | $ | 24.03 |
SARs exercisable, December 31 | $ | 24.60 |  | $ | 23.15 |  | $ | 20.95 |
Schedule of Nonvested Performance-based Share Activity | The following table summarizes changes in our outstanding PVS awards:
| 2015 |  | 2014 |  | 2013 |
Non-vested PVS awards, January 1 | 470,719 |  | 578,358 |  | 652,662 |
Granted at target level | 147,908 |  | 133,823 |  | 175,498 |
Adjustments above/(below) target | 132,444 |  | 53,438 |  | 38,330 |
Vested and converted | (318,337 | ) | (250,205 | ) | (273,044 | )
Forfeited | (10,008 | ) | (44,695 | ) | (15,088 | )
Non-vested PVS awards, December 31 | 422,726 |  | 470,719 |  | 578,358 |
Weighted Average Grant Date Fair Value | 2015 |  | 2014 |  | 2013 |
Non-vested PVS awards, January 1 | $ | 30.93 |  | $ | 23.79 |  | $ | 21.42 |
Granted at target level | 55.49 |  | 47.21 |  | 29.67 |
Adjustments above/(below) target | 22.97 |  | 22.86 |  | 23.83 |
Vested and converted | 51.53 |  | 48.69 |  | 29.56 |
Forfeited | 41.84 |  | 30.76 |  | 23.29 |
Non-vested PVS awards, December 31 | $ | 45.60 |  | $ | 30.93 |  | $ | 23.79 |
Schedule of Nonvested Performance-based Units Activity | The following table summarizes changes in our outstanding PVU awards:
| 2015 |  | 2014 |  | 2013 |
Non-vested PVU awards, January 1 | 55,509 |  | 79,456 |  | 69,240 |
Granted at target level | 1,386 |  | 1,584 |  | 25,538 |
Adjustments above/(below) target | 19,315 |  | 6,907 |  | 3,000 |
Vested and converted | (47,014 | ) | (32,438 | ) | (18,322 | )
Non-vested PVU awards, December 31 | 29,196 |  | 55,509 |  | 79,456 |
Weighted Average Grant Date Fair Value | 2015 |  | 2014 |  | 2013 |
Non-vested PVU awards, January 1 | $ | 26.15 |  | $ | 23.86 |  | $ | 20.98 |
Granted at target level | 54.14 |  | 47.34 |  | 29.56 |
Adjustments above/(below) target | 22.07 |  | 22.72 |  | 25.30 |
Vested and converted | 51.53 |  | 47.34 |  | 29.56 |
Non-vested PVU awards, December 31 | $ | 32.07 |  | $ | 26.15 |  | $ | 23.86 |

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