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Fair Value Impairment of Indefinite-lived Intangible Assets Measured at Fair Value on a Nonrecurring Basis (Details) (USD $) In Millions, unless otherwise specified |  |  | 12 Months Ended
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Dec. 31, 2011 Fair Value, Inputs, Level 3 [Member] | Dec. 31, 2010 Fair Value, Inputs, Level 3 [Member] | Dec. 31, 2011 Change in Fair Value from Asset Impairment [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other Assets, Fair Value Disclosure | $ 0 | $ 0 |
Impairment of Intangible Assets, Finite-lived |  |  | $ 1.6

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 46 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16373-109275 + Details
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Balance Type: | debit
Period Type: | duration

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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This element represents the fair value of assets categorized as other which are not in and of themselves material enough to require separate disclosure. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant