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Share Based Compensation Plan (Tables) | 12 Months Ended
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Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Fair value of liability cash-settled stock appreciation rights |
(in millions) |  | 2012 |  |  | 2011 |  |  | 2010 |
Balance at January 1 |  | $ | 2.2 |  |  | $ | 0.8 |  |  | $ | 0.2 |
Compensation charge |  |  | 5.8 |  |  |  | 1.4 |  |  |  | 0.6 |
Cash paid |  |  | (6.7 | ) |  |  | 0.0 |  |  |  | 0.0 |
Balance at December 31 |  | $ | 1.3 |  |  | $ | 2.2 |  |  | $ | 0.8 |
LTIP [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Assumptions used in the Monte Carlo model |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Dividend yield |  |  | 0.0 | % |  |  | 0.0 | % |  |  | 0.5 | %
Volatility |  |  | 0.0 | % |  |  | 53.5 | % |  |  | 69.0 | %
Risk free interest rate |  |  | 0.36 | % |  |  | 0.36 | % |  |  | 1.05 | %
Stock Options Plan [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Assumptions used to determine the fair value of options |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Dividend yield |  |  | 0.0 | % |  |  | 0.2 | % |  |  | 1.0 | %
Expected life |  |  | 5 years |  |  |  | 5 years |  |  |  | 5 years |
Volatility |  |  | 60.1 | % |  |  | 78.3 | % |  |  | 82.3 | %
Risk free interest rate |  |  | 0.43 | % |  |  | 1.22 | % |  |  | 1.36 | %
Summary of transactions of the Company's stock option plans |
|  | Number of Options |  |  | Weighted Average Exercise Price |  |  | Weighted Average Fair Value |
Outstanding at December 31, 2011 |  |  | 1,229,220 |  |  | $ | 5.44 |  |  |  |  |
Granted – at discount |  |  | 75,932 |  |  | $ | 0.00 |  |  | $ | 21.98 |
– at market value |  |  | 31,012 |  |  | $ | 29.56 |  |  | $ | 16.70 |
Exercised |  |  | (325,879 | ) |  | $ | 3.80 |  |  |  |  |
Forfeited |  |  | (9,044 | ) |  | $ | 10.00 |  |  |  |  |
Outstanding at December 31, 2012 |  |  | 1,001,241 |  |  | $ | 6.27 |  |  |  |  |
Summary of information about options outstanding |
Range of Exercise Price |  | Number Outstanding |  |  | Weighted Average Remaining Life in Years |  |  | Weighted Average Exercise Price |  |  | Number Exercisable and Fully Vested |  |  | Weighted Average Remaining Life in Years |  |  | Weighted Average Exercise Price |
$0 - $5 |  |  | 561,811 |  |  |  | 7.01 |  |  | $ | 0.59 |  |  |  | 128,617 |  |  |  | 6.04 |  |  | $ | 0.69 |
$5 - $10 |  |  | 20,654 |  |  |  | 2.71 |  |  | $ | 9.93 |  |  |  | 20,654 |  |  |  | 2.71 |  |  | $ | 9.93 |
$10 - $15 |  |  | 355,233 |  |  |  | 2.17 |  |  | $ | 11.27 |  |  |  | 0 |  |  |  | 0.00 |  |  | $ | 0.00 |
$20 - $25 |  |  | 11,185 |  |  |  | 5.18 |  |  | $ | 20.57 |  |  |  | 11,185 |  |  |  | 5.18 |  |  | $ | 20.57 |
$25 - $30 |  |  | 50,978 |  |  |  | 7.84 |  |  | $ | 28.59 |  |  |  | 11,666 |  |  |  | 4.14 |  |  | $ | 27.09 |
$30 - $35 |  |  | 1,380 |  |  |  | 8.37 |  |  | $ | 32.60 |  |  |  | 0 |  |  |  | 0.00 |  |  | $ | 0.00 |
|  |  | 1,001,241 |  |  |  |  |  |  |  |  |  |  |  | 172,122 |  |  |  |  |  |  |  |  |
Stock Equivalent Units [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary of information about options outstanding |
Range of Exercise Price |  | Number Outstanding |  |  | Weighted Average Remaining Life in Years |  |  | Weighted Average Exercise Price |  |  | Number Exercisable and Fully Vested |  |  | Weighted Average Remaining Life in Years |  |  | Weighted Average Exercise Price |
$0 - $5 |  |  | 529,142 |  |  |  | 7.64 |  |  | $ | 0.21 |  |  |  | 94,210 |  |  |  | 6.23 |  |  | $ | 1.17 |
$10 - $15 |  |  | 51,259 |  |  |  | 7.13 |  |  | $ | 10.38 |  |  |  | 0 |  |  |  | 0.00 |  |  | $ | 0.00 |
$25 - $30 |  |  | 43,427 |  |  |  | 8.31 |  |  | $ | 27.52 |  |  |  | 0 |  |  |  | 0.00 |  |  | $ | 0.00 |
|  |  | 623,828 |  |  |  |  |  |  |  |  |  |  |  | 94,210 |  |  |  |  |  |  |  |  |
SEUs assumptions used in Monte Carlo model |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Dividend yield |  |  | 0.0 | % |  |  | 0.0 | % |  |  | 0.5 | %
Volatility |  |  | 43.8 | % |  |  | 64.2 | % |  |  | 78.9 | %
Risk free interest rate |  |  | 0.36 | % |  |  | 0.36 | % |  |  | 1.05 | %
Summarizes the transactions of the SEUs |
|  | Number of SEUs |  |  | Weighted Average Exercise Price |  |  | Weighted Average Fair Value |
Outstanding at December 31, 2011 |  |  | 864,086 |  |  | $ | 2.30 |  |  |  |  |
Granted – at discount |  |  | 98,128 |  |  | $ | 0.00 |  |  | $ | 29.73 |
– at market value |  |  | 7,293 |  |  | $ | 29.56 |  |  | $ | 15.20 |
Exercised |  |  | (345,679 | ) |  | $ | 1.05 |  |  |  |  |
Outstanding at December 31, 2012 |  |  | 623,828 |  |  | $ | 2.95 |  |  |  |  |

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