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Debt (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Jun. 04, 2013
Debt Instrument [Line Items]      
Term loan - current portion, interest payable monthly $ 10.0 $ 0.0  
Hancock County industrial revenue bonds (IRBs) due 2028, interest payable quarterly (variable interest rates (not to exceed 12%)) (1) 7.8 7.8  
Term loan - less current portion, interest payable monthly 30.0 0.0  
Total debt 304.8 279.7  
Hawesville [Member]      
Debt Instrument [Line Items]      
Term loan - current portion, interest payable monthly 10.0 0.0  
Term loan - less current portion, interest payable monthly 30.0 0.0  
Long-term Debt [Member] | Senior secured notes due June 01, 2021 [Member]      
Debt Instrument [Line Items]      
7.5% senior secured notes due June 1, 2021, net of debt discount of $1.1 million and $1.4 million, respectively, interest payable semiannually $ 248.9 248.6  
Maturity date Jun. 01, 2021    
Stated interest rate, percentage 7.50%   7.50%
Debt discount $ 1.1 1.4  
Short-term Debt [Member] | Industrial revenue bonds due 2028 [Member]      
Debt Instrument [Line Items]      
Hancock County industrial revenue bonds (IRBs) due 2028, interest payable quarterly (variable interest rates (not to exceed 12%)) (1) $ 7.8 7.8  
Maturity date Apr. 01, 2028    
Stated interest rate, percentage 2.09%    
Short-term Debt [Member] | Industrial revenue bonds due 2028 [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Effective interest rate, maximum 12.00%    
Short-term Debt [Member] | Revolving Credit Facility, Portion Subject To Base Rate [Member]      
Debt Instrument [Line Items]      
Line of credit facility, interest rate at period end 6.00%    
Short-term Debt [Member] | U.S. revolving credit facility borrowings [Member]      
Debt Instrument [Line Items]      
U.S revolving credit facility $ 8.1 $ 23.3  
Stated interest rate, percentage 5.375%    
Short-term Debt [Member] | U.S. revolving credit facility borrowings [Member] | Revolving Credit Facility, Portion Subject To LIBOR Rate [Member]      
Debt Instrument [Line Items]      
Stated interest rate, percentage 2.53%