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Change in Valuation Allowance (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Valuation Allowance [Abstract] |  |  |
Balance at beginning of period | $ 489.9 | $ 508.1 | $ 425.5
(Reversed) charged to costs and expenses | (49.5) | (25.1) | 92.3
Charged (reversed) to gross tax assets and other accounts | (47.5) | 6.9 | (9.7)
Balance at end of period | $ 392.9 | $ 489.9 | $ 508.1

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- Definition The amount of the change in the period in the valuation allowance charged (reversed) to costs and expenses for a specified deferred tax asset. + References No definition available. + Details
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- Definition The amount of the change in the period in the valuation allowance charged (reversed) to gross tax assets and other accounts for a specified deferred tax asset. + References No definition available. + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 43-49 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 17 -Subparagraph e -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. + Details
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- Details
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