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Summary of Significant Accounting Policies - Research and Development (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Accounting Policies [Abstract]      
Research and Development Expense $ 17.4us-gaap_ResearchAndDevelopmentExpense $ 16.1us-gaap_ResearchAndDevelopmentExpense $ 22.3us-gaap_ResearchAndDevelopmentExpense
Customer funded research and development costs $ 2.7us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersCostsIncurredGross $ 2.7us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersCostsIncurredGross $ 1.5us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersCostsIncurredGross