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Stock Compensation (Tables) | 3 Months Ended
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Mar. 31, 2012
Granted Awards Activity | Our Board of Directors approved the grant of stock options, stock appreciation rights (SARs), restricted stock units (RSUs) and performance share units (PSUs) shown in the table below during the first quarter of 2012 under the 2008 Omnibus Incentive Plan.
|  |  |  |  | Weighted-average Per Share |
|  | Granted |  |  | Exercise |  |  | Grant Date |
|  | (In millions) |  |  | Price |  |  | Fair Value |
Stock options |  |  | 0.7 |  |  | $ | 15.99 |  |  | $ | 7.92 |
SARs |  |  | 0.2 |  |  | $ | 15.97 |  |  | $ | 7.90 |
RSUs |  |  | 0.6 |  |  |  |  |  |  | $ | 15.91 |
PSUs |  |  | 0.1 |  |  |  |  |  |  | $ | 16.00 |
Key Assumptions as Part of Black-Scholes Option Pricing Model | We estimated fair values for options and SARs granted during 2012 using the following key assumptions as part of the Black-Scholes option pricing model. The expected term was estimated using the simplified method because the limited period of time our common stock has been publicly traded provides insufficient historical exercise data. The dividend yield was calculated by dividing the expected annual dividend by the average stock price of our common stock over the prior year. The expected volatility was estimated using a combination of the historical volatility of similar entities and the implied volatility of our exchange-traded options.
|  | Options |  |  | SARs |
Expected term (in years) |  |  | 6.00 |  |  |  | 6.00 |
Risk-free interest rate |  |  | 1.24 | % |  |  | 1.24 | %
Dividend yield |  |  | 1.33 | % |  |  | 1.33 | %
Expected volatility |  |  | 59.90 | % |  |  | 59.90 | %

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- Definition Tabular disclosure of share-based compensation plans that may be presented in a single table for outstanding, vested and expected to vest, and exercisable awards. The information that may be disclosed in this table may include, but is not limited to, number of shares, weighted average exercise price, weighted average remaining contractual life, and aggregate intrinsic value. + References No definition available. + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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