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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2014
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 for the years ended December 31:
($ in millions) | 2014 |  | 2013 |  | 2012 |
Stock option and appreciation rights | $ | 7.6 |  | $ | 7.7 |  | $ | 5.3 |
Performance-vesting shares | 6.5 |  | 6.5 |  | 6.0 |
Performance-vesting units | 1.9 |  | 2.4 |  | 0.9 |
Performance-vesting shares/units dividend equivalents | 0.4 |  | 0.4 |  | 0.1 |
Employee stock purchase plan | 0.5 |  | 0.4 |  | 0.4 |
Deferred compensation plans | 1.7 |  | 3.8 |  | 2.8 |
Total stock-based compensation expense | $ | 18.6 |  | $ | 21.2 |  | $ | 15.5 |
Schedule of Stock Options Activity | The following table summarizes changes in outstanding options:
(in millions, except per share data) | 2014 |  | 2013 |  | 2012 |
Options outstanding, January 1 | 4.8 |  | 5.6 |  | 5.8 |
Granted | 0.7 |  | 0.9 |  | 1.2 |
Exercised | (0.7 | ) | (1.6 | ) | (1.4 | )
Forfeited | (0.2 | ) | (0.1 | ) | — |
Options outstanding, December 31 | 4.6 |  | 4.8 |  | 5.6 |
Options exercisable, December 31 | 2.6 |  | 2.3 |  | 3.0 |
Weighted Average Exercise Price | 2014 |  | 2013 |  | 2012 |
Options outstanding, January 1 | $ | 21.99 |  | $ | 19.83 |  | $ | 17.88 |
Granted | 47.59 |  | 29.71 |  | 21.47 |
Exercised | 20.17 |  | 18.97 |  | 13.12 |
Forfeited | 31.42 |  | 23.10 |  | 20.66 |
Options outstanding, December 31 | $ | 25.49 |  | $ | 21.99 |  | $ | 19.83 |
Options exercisable, December 31 | $ | 20.67 |  | $ | 19.51 |  | $ | 19.01 |
Schedule of Stock Appreciation Rights Award Activity | The following table summarizes changes in outstanding SARs:
| 2014 |  | 2013 |  | 2012 |
SARs outstanding, January 1 | 375,104 |  | 389,686 |  | 320,336 |
Granted | 7,733 |  | 132,566 |  | 145,018 |
Exercised | (85,123 | ) | (147,148 | ) | (75,668 | )
SARs outstanding, December 31 | 297,714 |  | 375,104 |  | 389,686 |
SARs exercisable, December 31 | 88,751 |  | 56,938 |  | 110,292 |
Weighted Average Exercise Price | 2014 |  | 2013 |  | 2012 |
SARs outstanding, January 1 | $ | 24.03 |  | $ | 20.81 |  | $ | 20.17 |
Granted | 47.74 |  | 29.56 |  | 21.22 |
Exercised | 22.09 |  | 20.47 |  | 18.91 |
SARs outstanding, December 31 | $ | 25.20 |  | $ | 24.03 |  | $ | 20.81 |
SARs exercisable, December 31 | $ | 23.15 |  | $ | 20.95 |  | $ | 20.70 |
Schedule of Nonvested Performance-based Share Activity | The following table summarizes changes in our outstanding PVS awards:
| 2014 |  | 2013 |  | 2012 |
Non-vested PVS awards, January 1 | 578,358 |  | 652,662 |  | 657,038 |
Granted at target level | 133,823 |  | 175,498 |  | 209,680 |
Adjustments above/(below) target | 53,438 |  | 38,330 |  | (120,155 | )
Vested and converted | (250,205 | ) | (273,044 | ) | (83,859 | )
Forfeited | (44,695 | ) | (15,088 | ) | (10,042 | )
Non-vested PVS awards, December 31 | 470,719 |  | 578,358 |  | 652,662 |
Weighted Average Grant Date Fair Value | 2014 |  | 2013 |  | 2012 |
Non-vested PVS awards, January 1 | $ | 23.79 |  | $ | 21.42 |  | $ | 19.39 |
Granted at target level | 47.21 |  | 29.67 |  | 21.33 |
Adjustments above/(below) target | 22.86 |  | 23.83 |  | 13.86 |
Vested and converted | 48.69 |  | 29.56 |  | 21.22 |
Forfeited | 30.76 |  | 23.29 |  | 20.98 |
Non-vested PVS awards, December 31 | $ | 30.93 |  | $ | 23.79 |  | $ | 21.42 |
Schedule of Nonvested Performance-based Units Activity | The following table summarizes changes in our outstanding PVU awards:
| 2014 |  | 2013 |  | 2012 |
Non-vested PVU awards, January 1 | 79,456 |  | 69,240 |  | 54,572 |
Granted at target level | 1,584 |  | 25,538 |  | 27,100 |
Adjustments above/(below) target | 6,907 |  | 3,000 |  | (7,156 | )
Vested and converted | (32,438 | ) | (18,322 | ) | (5,276 | )
Non-vested PVU awards, December 31 | 55,509 |  | 79,456 |  | 69,240 |
Weighted Average Grant Date Fair Value | 2014 |  | 2013 |  | 2012 |
Non-vested PVU awards, January 1 | $ | 23.86 |  | $ | 20.98 |  | $ | 19.65 |
Granted at target level | 47.34 |  | 29.56 |  | 21.22 |
Adjustments above/(below) target | 22.72 |  | 25.30 |  | 15.22 |
Vested and converted | 47.34 |  | 29.56 |  | 21.22 |
Non-vested PVU awards, December 31 | $ | 26.15 |  | $ | 23.86 |  | $ | 20.98 |

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