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Stockholders' Equity and Share Based Compensation Plans (Details 3) (USD $) In Millions, unless otherwise specified | 6 Months Ended
--- | ---
Jun. 30, 2012 | Jun. 30, 2011
Fair value of liability cash-settled stock appreciation rights |  |
Beginning balance | $ 2.2 | $ 0.8
Compensation charge | 3.0 | 1.6
Closing balance | $ 5.2 | $ 2.4

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