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Stock-Based Compensation (Details 7) (USD $) In Millions, except Per Share data, unless otherwise specified | 12 Months Ended | 1 Months Ended | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Supplemental Employee Incentive Plan tradingdays | Dec. 31, 2011 Supplemental Employee Incentive Plan | Dec. 31, 2010 Supplemental Employee Incentive Plan | Dec. 31, 2012 Supplemental Employee Incentive Plan February 2013 Trigger Achievement | Dec. 31, 2012 Supplemental Employee Incentive Plan Interim trigger date occurs by June 30, 2014 | Feb. 28, 2013 Supplemental Employee Incentive Plan Interim trigger date occurs by June 30, 2014 February 2013 Trigger Achievement | Dec. 31, 2012 Supplemental Employee Incentive Plan Final trigger date occurs by June 30, 2016
Stock-Based Compensation arrangements |  |  |  |  |  |  |  |  |  |
Stock based compensation expense | $ 33.5 | $ 39.5 | $ 14.4 | $ 1.4 | $ 1.2 | $ (0.9) |  |  |  |
Number of trading days during which the closing price per share of the Company's common stock equals or exceeds the goal price |  |  |  | 20 |  |  |  |  |  |
Number of consecutive trading days |  |  |  | 60 days |  |  |  |  |  |
Interim goal price (in dollars per share) |  |  |  |  |  |  |  | $ 50 |  |
Final goal price (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 75
Percentage of eligible employee's base salary for interim distribution |  |  |  |  |  |  |  | 20.00% |  |
Total percentage of salary eligible for final distribution if final trigger is achieved |  |  |  |  |  |  |  |  |  | 50.00%
Incremental percentage of salary eligible for final distribution if compay paid interim distributions upon achievement of the interim trigger |  |  |  |  |  |  |  |  |  | 30.00%
Percentage of the total distribution paid immediately |  |  |  |  |  |  | 25.00% |  |  |
Percentage of the total distribution paid on deferred payment dates |  |  |  |  |  |  | 75.00% |  |  |
Distribution to be made to company's employees due to achievement of interim goal price of $50 per share |  |  |  |  |  |  |  |  | 6.8 |
Percentage of total interim distribution paid in February |  |  |  |  |  |  |  |  | 25.00% |
Current distribution to be made to company's employees due to achievement of interim goal price of $50 per share |  |  |  |  |  |  |  |  | 1.7 |
Percentage of total interim distribution deferred |  |  |  |  |  |  |  |  | 75.00% |
Deferred distribution to be made to company's employees due to achievement of interim goal price of $50 per share |  |  |  |  |  |  |  |  | $ 5.1 |

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