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Stockholders' Equity (Details 6) (USD $) In Millions, unless otherwise specified | Dec. 31, 2011
--- | ---
Estimated amount of share-based compensation expense |
2012 | $ 15.9
2013 | 8.1
2014 | 1.5
Total | 25.5
2011 Three-year PSU Awards [Member] |
Estimated amount of share-based compensation expense |
2012 | 2.9
2013 | 2.8
2014 | 0
Total | 5.7
2010 Three-year PSU Awards [Member] |
Estimated amount of share-based compensation expense |
2012 | 4.1
2013 | 0
2014 | 0
Total | 4.1
SLO Awards [Member] |
Estimated amount of share-based compensation expense |
2012 | 0.1
2013 | 0
2014 | 0
Total | 0.1
Other long-term share-based incentive compensation programs [Member] |
Estimated amount of share-based compensation expense |
2012 | 8.8
2013 | 5.3
2014 | 1.5
Total | $ 15.6

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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph h -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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