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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2013
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) | 2013 |  | 2012 |  | 2011 |
Stock option and appreciation rights | $ | 7.7 |  | $ | 5.3 |  | $ | 4.4 |
Performance-vesting shares | 6.5 |  | 6.0 |  | 3.0 |
Performance-vesting units | 2.4 |  | 0.9 |  | 0.2 |
Performance-vesting shares/units dividend equivalents | 0.4 |  | 0.1 |  | 0.1 |
Employee stock purchase plan | 0.4 |  | 0.4 |  | 0.3 |
Deferred compensation plans | 3.8 |  | 2.8 |  | 0.4 |
Total stock-based compensation expense | $ | 21.2 |  | $ | 15.5 |  | $ | 8.4 |
Schedule of Stock Options Activity | The following table summarizes changes in outstanding options:
(in millions, except per share data) | 2013 |  | 2012 |  | 2011 |
Options outstanding, January 1 | 5.6 |  | 5.8 |  | 5.7 |
Granted | 0.9 |  | 1.2 |  | 1.0 |
Exercised | (1.6 | ) | (1.4 | ) | (0.8 | )
Forfeited | (0.1 | ) | — |  | (0.1 | )
Options outstanding, December 31 | 4.8 |  | 5.6 |  | 5.8 |
Options exercisable, December 31 | 2.3 |  | 3.0 |  | 3.5 |
Weighted Average Exercise Price | 2013 |  | 2012 |  | 2011 |
Options outstanding, January 1 | $ | 19.83 |  | $ | 17.88 |  | $ | 16.16 |
Granted | 29.71 |  | 21.47 |  | 20.43 |
Exercised | 18.97 |  | 13.12 |  | 8.84 |
Forfeited | 23.10 |  | 20.66 |  | 19.84 |
Options outstanding, December 31 | $ | 21.99 |  | $ | 19.83 |  | $ | 17.88 |
Options exercisable, December 31 | $ | 19.51 |  | $ | 19.01 |  | $ | 16.46 |
Schedule of Stock Appreciation Rights Award Activity | The following table summarizes changes in outstanding SARs:
| 2013 |  | 2012 |  | 2011 |
SARs outstanding, January 1 | 389,686 |  | 320,336 |  | 222,096 |
Granted | 132,566 |  | 145,018 |  | 126,048 |
Exercised | (147,148 | ) | (75,668 | ) | (15,370 | )
Forfeited | — |  | — |  | (12,438 | )
SARs outstanding, December 31 | 375,104 |  | 389,686 |  | 320,336 |
SARs exercisable, December 31 | 56,938 |  | 110,292 |  | 117,800 |
Weighted Average Exercise Price | 2013 |  | 2012 |  | 2011 |
SARs outstanding, January 1 | $ | 20.81 |  | $ | 20.17 |  | $ | 19.87 |
Granted | 29.56 |  | 21.22 |  | 20.57 |
Exercised | 20.47 |  | 18.91 |  | 19.58 |
Forfeited | — |  | — |  | 19.59 |
SARs outstanding, December 31 | 24.03 |  | 20.81 |  | 20.17 |
SARs exercisable, December 31 | $ | 20.95 |  | $ | 20.70 |  | $ | 19.86 |
Schedule of Nonvested Performance-based Share Activity | The following table summarizes changes in our outstanding PVS awards:
| 2013 |  | 2012 |  | 2011 |
Non-vested PVS awards, January 1 | 652,662 |  | 657,038 |  | 695,100 |
Granted at target level | 175,498 |  | 209,680 |  | 202,198 |
Adjustments above/(below) target | 38,330 |  | (120,155 | ) | (116,355 | )
Vested and converted | (273,044 | ) | (83,859 | ) | (103,507 | )
Forfeited | (15,088 | ) | (10,042 | ) | (20,398 | )
Non-vested PVS awards, December 31 | 578,358 |  | 652,662 |  | 657,038 |
Weighted Average Grant Date Fair Value | 2013 |  | 2012 |  | 2011 |
Non-vested PVS awards, January 1 | $ | 21.42 |  | $ | 19.39 |  | $ | 19.61 |
Granted at target level | 29.67 |  | 21.33 |  | 20.43 |
Adjustments above/(below) target | 23.83 |  | 13.86 |  | 20.97 |
Vested and converted | 29.56 |  | 21.22 |  | 20.43 |
Forfeited | 23.29 |  | 20.98 |  | 19.23 |
Non-vested PVS awards, December 31 | $ | 23.79 |  | $ | 21.42 |  | $ | 19.39 |
Schedule of Nonvested Performance-based Units Activity | The following table summarizes changes in our outstanding PVU awards:
| 2013 |  | 2012 |  | 2011 |
Non-vested PVU awards, January 1 | 69,240 |  | 54,572 |  | 46,840 |
Granted at target level | 25,538 |  | 27,100 |  | 26,884 |
Adjustments above/(below) target | 3,000 |  | (7,156 | ) | (8,330 | )
Vested and converted | (18,322 | ) | (5,276 | ) | (7,386 | )
Forfeited | — |  | — |  | (3,436 | )
Non-vested PVU awards, December 31 | 79,456 |  | 69,240 |  | 54,572 |
Weighted Average Grant Date Fair Value | 2013 |  | 2012 |  | 2011 |
Non-vested PVU awards, January 1 | $ | 20.98 |  | $ | 19.65 |  | $ | 19.47 |
Granted at target level | 29.56 |  | 21.22 |  | 20.56 |
Adjustments above/(below) target | 25.30 |  | 15.22 |  | 20.53 |
Vested and converted | 29.56 |  | 21.22 |  | 20.43 |
Forfeited | — |  | — |  | 18.77 |
Non-vested PVU awards, December 31 | $ | 23.86 |  | $ | 20.98 |  | $ | 19.65 |

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