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Contingencies (Insurance Claim) (Details) (USD $)
12 Months Ended 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2014
Loss Contingencies [Line Items]        
Insurance Settlements $ 15,700,000lby_InsuranceSettlements     $ 15,700,000lby_InsuranceSettlements
Insurance claim receivable   5,000,000us-gaap_InsuranceSettlementsReceivable    
Proceeds from insurance settlement, investing activities 2,350,000us-gaap_ProceedsFromInsuranceSettlementInvestingActivities 0us-gaap_ProceedsFromInsuranceSettlementInvestingActivities 0us-gaap_ProceedsFromInsuranceSettlementInvestingActivities  
Proceeds from insurance settlement, operating activities 13,300,000us-gaap_ProceedsFromInsuranceSettlementOperatingActivities      
Cost of Sales        
Loss Contingencies [Line Items]        
Insurance recoveries       10,700,000us-gaap_InsuranceRecoveries
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
Prior period reclassification adjustment $ 2,100,000us-gaap_PriorPeriodReclassificationAdjustment
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember