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Related-party Transactions (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Related Party Transactions [Abstract]      
Revenue from related parties $ 2.8us-gaap_RevenueFromRelatedParties $ 4.4us-gaap_RevenueFromRelatedParties $ 5.4us-gaap_RevenueFromRelatedParties
Gross accounts receivable $ 0.4us-gaap_AccountsReceivableRelatedPartiesCurrent $ 0.1us-gaap_AccountsReceivableRelatedPartiesCurrent