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Other Intangible Assets and Goodwill - Narrative (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Schedule of Finite-Lived Intangible Assets and Goodwill [Line Items]    
Impairment of assets   2.6
Names database
   
Schedule of Finite-Lived Intangible Assets and Goodwill [Line Items]    
Finite-lived intangible asset, useful life 9 months 9 months