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Share-Based Compensation (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||||
|---|---|---|---|---|---|---|
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Jun. 30, 2012
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Jun. 30, 2011
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Jun. 30, 2012
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Jun. 30, 2011
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Jun. 30, 2012
1997 Plan and 2003 Plan [Member]
Y
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Dec. 31, 2011
1997 Plan and 2003 Plan [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||
| Total share-based compensation expense recognized | $ 1.9 | $ 6.3 | $ 4.2 | $ 14.4 | ||
| Total unrecognized compensation cost related to non-vested share-based compensation | $ 7.4 | $ 7.7 | ||||
| Recognition period for total unrecognized compensation expense | 4 | |||||
| Weighted average recognition period on unrecognized compensation expense | 2.4 | |||||
| X | ||||||||||
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- Definition
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Recognition Period No definition available.
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| X | ||||||||||
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- Definition
As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, using a decimal to express in number of years. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Equity-based compensation cost during the period with respect to the award, which will be recognized in income (as well as the total recognized tax benefit) or capitalized as part of the cost of an asset. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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