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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

X

- Definition

Change in fair value of liability cash-settled stock appreciation rights.

+ References

No definition available.

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- Definition

Fair value of liability cash-settled stock appreciation rights.

+ References

No definition available.

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