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Summary of Significant Accounting Policies - Advertising and Sales Promotion Costs (Details) (Selling, General and Administrative Expenses [Member], USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Selling, General and Administrative Expenses [Member]
     
Advertising Costs [Line Items]      
Advertising Costs $ 9.8us-gaap_AdvertisingExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember
$ 8.9us-gaap_AdvertisingExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember
$ 7.9us-gaap_AdvertisingExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember