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Organization and Basis of Presentation Research and Development (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Research and development expense $ 103.9us-gaap_ResearchAndDevelopmentExpense $ 103.4us-gaap_ResearchAndDevelopmentExpense $ 123.4us-gaap_ResearchAndDevelopmentExpense