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Borrowings (ABL Credit Agreement Narrative) (Details) - Subsidiaries, Libbey Glass and Libbey Europe - Asset-backed Loan Facility - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Line of Credit    
Debt Instrument [Line Items]    
Line of credit facility, current borrowing capacity, amount of rent reserves offset $ 0.5  
Line of credit facility, maximum borrowing capacity 100.0  
Line of credit facility, remaining borrowing capacity 59.6 $ 91.9
Letter of Credit    
Debt Instrument [Line Items]    
Line of credit facility, maximum borrowing capacity 15.0  
Line of credit facility, amount outstanding $ 7.9