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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] |
Stock-based compensation expense | Stock-based compensation expense was as follows:
| Years ended December 31,
| 2013 |  | 2012 |  | 2011
| ($ in millions)
Stock-based compensation | $ | 13.3 |  |  | $ | 8.4 |  |  | $ | 8.8 |
Mark-to-market adjustments | 4.2 |  |  | 0.9 |  |  | (0.5 | )
Total expense | $ | 17.5 |  |  | $ | 9.3 |  |  | $ | 8.3 |
Stock Options Activity | Stock option transactions were as follows:
|  |  |  |  |  |  | Exercisable
| Shares |  | Option Price |  | Weighted Average Option Price |  | Options |  | Weighted Average Exercise Price
Outstanding at January 1, 2013 | 4,060,790 |  |  | $14.28-23.78 |  |  | $ | 18.39 |  |  | 2,961,434 |  |  | $ | 18.00 |
Granted | 621,000 |  |  | 23.28 |  |  | 23.28 |  |  |  |  |
Exercised | (534,905 | ) |  | 14.28-23.78 |  |  | 16.72 |  |  |  |  |
Canceled | (32,063 | ) |  | 15.35-23.28 |  |  | 20.57 |  |  |  |  |
Outstanding at December 31, 2013 | 4,114,822 |  |  | $14.28-23.78 |  |  | $ | 19.33 |  |  | 3,011,702 |  |  | $ | 18.29 |
Stock Options Exercisable, Exercise Price Range | The following table provides certain information with respect to stock options exercisable at December 31, 2013:
Range of Exercise Prices |  | Options Exercisable |  | Weighted Average Exercise Price |  | Options Outstanding |  | Weighted Average Exercise Price
Under $16.00 |  | 1,039,677 |  |  | $ | 15.04 |  |  | 1,039,677 |  |  | $ | 15.04 |
$16.00 – $20.00 |  | 751,391 |  |  | $ | 17.85 |  |  | 932,041 |  |  | $ | 18.03 |
Over $20.00 |  | 1,220,634 |  |  | $ | 21.34 |  |  | 2,143,104 |  |  | $ | 21.98 |
|  | 3,011,702 |  |  |  |  | 4,114,822 |  |  |
Common shares reserved and available for grant or purchase | At December 31, 2013, common shares reserved for issuance and available for grant or purchase under the following plans consisted of:
| Number of Shares
Stock Option Plans | Reserved for Issuance |  | Available for Grant or Purchase(1)
2000 long term incentive plan | 420,406 |  |  | 11,413 |
2003 long term incentive plan | 794,607 |  |  | 28,673 |
2006 long term incentive plan | 1,814,133 |  |  | 217,733 |
2009 long term incentive plan | 2,971,473 |  |  | 950,480 |
| 6,000,619 |  |  | 1,208,299 |
1996 stock option plan (plan expired) | 34,602 |  |  | — |
Total under stock option plans | 6,035,221 |  |  | 1,208,299 |
| Number of Shares
Stock Purchase Plans | Reserved for Issuance |  | Available for Grant or Purchase
1997 stock plan for non-employee directors | 590,043 |  |  | 173,766 |
Employee deferral plan | 46,110 |  |  | 45,629 |
Total under stock purchase plans | 636,153 |  |  | 219,395 |
Performance Shares Transactions | Performance share transactions were as follows:
| To Settle in Cash |  | To Settle in Shares
| Shares |  | Weighted Average Fair Value per Share |  | Shares |  | Weighted Average Fair Value per Share
Outstanding at January 1, 2013 | 245,167 |  |  | $ | 21.45 |  |  | 242,250 |  |  | $ | 19.22 |
Granted | 150,222 |  |  | 22.71 |  |  | 149,250 |  |  | 21.40 |
Paid/Issued | (99,889 | ) |  | 21.45 |  |  | (96,000 | ) |  | 15.68 |
Converted from shares to cash | 3,611 |  |  | 20.26 |  |  | (3,611 | ) |  | 20.26 |
Canceled | (2,889 | ) |  | 22.19 |  |  | (2,889 | ) |  | 21.99 |
Outstanding at December 31, 2013 | 296,222 |  |  | $ | 28.90 |  |  | 289,000 |  |  | $ | 21.48 |
Total vested at December 31, 2013 | 194,056 |  |  | $ | 28.90 |  |  | 186,833 |  |  | $ | 20.75 |
Summary of Unvested Performance Shares | The summary of the status of our unvested performance shares to be settled in cash were as follows:
| Shares |  | Weighted Average Fair Value per Share
Unvested at January 1, 2013 | 91,750 |  |  | $ | 21.45 |
Granted | 150,222 |  |  | 22.96 |
Vested | (136,917 | ) |  | 28.90 |
Canceled | (2,889 | ) |  | 22.19 |
Unvested at December 31, 2013 | 102,166 |  |  | $ | 28.90 |

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