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Debt (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Jun. 30, 2013
Debt Instrument [Line Items]      
Term loan - current portion $ 20.0 $ 0.0  
Hancock County industrial revenue bonds (IRBs) due April 2028, interest payable quarterly (variable interest rates (not to exceed 12%)) 7.8 7.8  
Hawesville term loan - less current portion 20.0 0.0  
Total 301.0 279.7  
Hawesville [Member]      
Debt Instrument [Line Items]      
Term loan - current portion 20.0 0.0  
Hawesville term loan - less current portion 20.0 0.0  
Industrial revenue bonds due 2028 [Member] | Short-term Debt [Member]      
Debt Instrument [Line Items]      
Hancock County industrial revenue bonds (IRBs) due April 2028, interest payable quarterly (variable interest rates (not to exceed 12%)) $ 7.8 7.8  
Stated interest rate 1.80%    
Maturity date Apr. 01, 2028    
Senior secured notes due June 01, 2021 [Member] | Long-term Debt [Member]      
Debt Instrument [Line Items]      
7.5% senior secured notes due June 2021, net of debt discount of $0.8 million and $1.4 million, respectively, interest payable semiannually $ 249.2 248.6  
Stated interest rate 7.50%   7.50%
Maturity date Jun. 01, 2021    
Debt discount $ 0.8 1.4  
U.S revolving credit facility [Member]      
Debt Instrument [Line Items]      
Stated interest rate 5.00%    
Revolving Credit Facility [Member] | Short-term Debt [Member]      
Debt Instrument [Line Items]      
Stated interest rate 5.375%    
Revolving Credit Facility [Member] | Short-term Debt [Member] | Revolving Credit Facility, Portion Subject To LIBOR Rate [Member]      
Debt Instrument [Line Items]      
Stated interest rate 1.90%    
Maximum [Member] | Industrial revenue bonds due 2028 [Member] | Short-term Debt [Member]      
Debt Instrument [Line Items]      
Effective interest rate (percent) 12.00%    
Letter of Credit [Member] | Short-term Debt [Member]      
Debt Instrument [Line Items]      
U.S. Revolving Credit Facility $ 4.0 $ 23.3