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Stockholders' Equity and Share Based Compensation Plans (Details 3) (USD $) In Millions, unless otherwise specified | 9 Months Ended
--- | ---
Sep. 30, 2012 | Sep. 30, 2011
Fair value of liability cash-settled stock appreciation rights |  |
Beginning balance | $ 2.2 | $ 0.8
Compensation charge | 5.2 | 0.4
Ending balance | $ 7.4 | $ 1.2

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- Definition Fair value of liability cash-settled stock appreciation rights. + References No definition available. + Details
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