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Summary of Significant Accounting Policies Impairment of Long-Lived Assets (Details) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
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Dec. 31, 2011
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Dec. 31, 2009
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Mar. 31, 2009
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| Impairment of Long Lived Assets [Abstract] | |||
| Impairment of Intangible Assets (Excluding Goodwill) | $ 30.6 | ||
| Acquired Finite-lived Intangible Asset, Amount | 21.2 | ||
| Asset Impairment Charges | $ 9.4 | ||
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- Details
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- Definition
The aggregate amount assigned to a major class of finite-lived intangible assets acquired either individually or as part of a group of assets (in either an asset acquisition or business combination). A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The charge against earnings resulting from the aggregate write down of all assets from their carrying value to their fair value. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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