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Summary of Significant Accounting Policies - Accounts Receivable (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
customer
Dec. 31, 2012
customer
Dec. 31, 2011
customer
Concentration Risk [Line Items]      
Allowances for Doubtful Accounts $ 5.3 $ 5.5  
Related party accounts receivable $ 3.1 $ 3.1  
Sales Revenue, Goods, Net [Member]
      
Concentration Risk [Line Items]      
Concentration Risk, Number of Customers 0 0 0