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Share-based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
May 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Maximum issuable shares under Omnibus Supplemental Incentive Plan       14,400,000
Shares available for future grant under Omnibus Supplemental Incentive Plan 14,000,000      
Share-based Compensation Expense [Abstract]        
Share-based Compensation Expense $ 9.2 $ 9.2 $ 7.7  
Stock Options [Member]        
Share-based Compensation Expense [Abstract]        
Share-based Compensation Expense $ 2.5 $ 2.5 $ 2.1  
Share based compensation estimated to be forfeited (in hundredths) 5.00%      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]        
Expected volatility, minimum (in hundredths) 63.60% 58.80% 61.50%  
Expected volatility, maximum (in hundredths) 65.30% 61.60% 64.00%  
Weighted-average volatility (in hundredths) 64.50% 59.50% 62.50%  
Risk-free interest rate, minimum (in hundredths) 2.60% 2.30% 1.60%  
Risk-free interest rate, maximum (in hundredths) 2.70% 2.60% 2.20%  
Weighted-average grant-date fair value per share of options granted $ 1.52 $ 3.51 $ 5.33  
Summary of changes in shares outstanding under all long-term incentive plans [Rollforward]        
Number of options outstanding, beginning balance (in shares) 3,403,862      
Number of options granted (in shares) 1,199,415      
Number of options exercised (in shares) (43,167)      
Number of options canceled (in shares) (428,701)      
Number of options outstanding, ending balance (in shares) 4,131,409 3,403,862    
Number of exercisable options (in shares) 2,215,816      
Number of unvested options (in shares) 1,915,593      
Number of unvested options that are expected to vest (in shares) 1,819,813      
Weighted average exercise price per option, outstanding, beginning of period (dollars per share) $ 6.90      
Weighted average exercise price per option granted (dollars per share) 2.66      
Weighted average exercise price per option exercised (dollars per share) 1.74      
Weighted average exercise price per option canceled (dollars per share) 11.38      
Weighted average exercise price per option, outstanding, end of period (dollars per share) 5.26 $ 6.90    
Weighted average exercise price per exercisable option (dollars per share) 6.01      
Weighted average exercise price per unvested options (dollars per share) 4.39      
Weighted average exercise price per unvested options that expected to vest (dollars per share) $ 4.39      
Remaining average contractual life of options outstanding (in years) 6 years 10 months 24 days      
Remaining average contractual life of options exercisable (in years) 5 years 3 months 18 days      
Remaining average contractual life of unvested options (in years) 8 years 4 months 24 days      
Remaining average contractual life of unvested options that are expected to vest (in years) 8 years 4 months 24 days      
Aggregate intrinsic value of options outstanding, outstanding $ 1.6      
Aggregate intrinsic value of options outstanding, exercisable 0.8      
Aggregate intrinsic value of options outstanding, unvested 0.7      
Aggregate intrinsic value of options outstanding, unvested and expected to vest 0.7      
Intrinsic value of stock options exercised 0.1 $ 0.3 $ 0.2  
Amount of unrecognized compensation costs $ 0.8      
Weighted average period of recognition (in years) 1 year 7 months 6 days      
Restricted Stock [Member]        
Share-based Compensation Expense [Abstract]        
Share-based Compensation Expense $ 2.3 $ 3.1 $ 2.9  
Summary of changes in shares outstanding under all long-term incentive plans [Rollforward]        
Amount of unrecognized compensation costs $ 0.9      
Weighted average period of recognition (in years) 1 year 7 months 6 days      
Summary of nonvested shares [Roll Forward]        
Nonvested, beginning of period (in shares) 506,703      
Granted (in shares) 772,054      
Vested/restrictions lapsed/earned (in shares) (745,001)      
Canceled (in shares) (93,651)      
Nonvested, end of period (in shares) 440,105 506,703    
Weighted average grant date fair value, nonvested, beginning of period (dollars per share) $ 6.45      
Weighted average grant date fair value, granted (dollars per share) 2.65 $ 6.56 $ 9.78  
Weighted average grant date fair value, vested/restrictions lapsed/earned (dollars per share) 3.98      
Weighted average grant date fair value, canceled (dollars per share) 4.32      
Weighted average grant date fair value, nonvested, end of period (dollars per share) $ 4.42 $ 6.45    
Intrinsic value of shares vested/restrictions lapsed during the period $ 2.0 $ 3.2 $ 4.1  
Restricted Stock Units Issued to Directors [Member]        
Share-based Compensation Expense [Abstract]        
Share-based Compensation Expense $ 1.1 1.2 1.2  
Summary of nonvested shares [Roll Forward]        
Share Based Compensation Arrangement By Share Based Payment Award, Award Period Until Settlement 1 year      
Deferred Compensation Arrangement With Individual, Period To Defer Settlement Following Termination Of Service 6 months      
Deferred Compensation Arrangement with Individual, Maximum Period to Receive Installments 15 years      
Performance Shares [Member]        
Share-based Compensation Expense [Abstract]        
Share-based Compensation Expense $ 2.3 $ 2.0 $ 1.5  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]        
Weighted-average volatility (in hundredths) 62.30% 67.30% 68.00%  
Weighted-average volatility VanEck Vectors Steel ETF (in hundredths) 45.30% 52.20% 48.90%  
Risk-free interest rate (in hundredths) 2.60% 2.20% 1.50%  
Summary of changes in shares outstanding under all long-term incentive plans [Rollforward]        
Amount of unrecognized compensation costs $ 2.1      
Weighted average period of recognition (in years) 1 year 7 months 6 days      
Summary of nonvested shares [Roll Forward]        
Nonvested, beginning of period (in shares) 614,800      
Granted (in shares) 595,733      
Vested/restrictions lapsed/earned (in shares) 0      
Canceled (in shares) (338,058)      
Nonvested, end of period (in shares) 872,475 614,800    
Weighted average grant date fair value, nonvested, beginning of period (dollars per share) $ 9.19      
Weighted average grant date fair value, granted (dollars per share) 3.09 $ 8.05 $ 10.78  
Weighted average grant date fair value, vested/restrictions lapsed/earned (dollars per share) 0      
Weighted average grant date fair value, canceled (dollars per share) 9.38      
Weighted average grant date fair value, nonvested, end of period (dollars per share) $ 4.95 $ 9.19    
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period 3 years      
Long-term Performance Plan [Member]        
Share-based Compensation Expense [Abstract]        
Share-based Compensation Expense $ 1.0 $ 0.4 $ 0.0  
Summary of changes in shares outstanding under all long-term incentive plans [Rollforward]        
Amount of unrecognized compensation costs $ 1.6      
Weighted average period of recognition (in years) 1 year 9 months 18 days      
Summary of nonvested shares [Roll Forward]        
Nonvested, beginning of period (in shares) 250,400      
Granted (in shares) 678,714      
Canceled (in shares) (70,900)      
Nonvested, end of period (in shares) 858,214 250,400    
Weighted average grant date fair value, nonvested, beginning of period (dollars per share) $ 5.04      
Weighted average grant date fair value, granted (dollars per share) 2.66      
Weighted average grant date fair value, canceled (dollars per share) 3.39      
Weighted average grant date fair value, nonvested, end of period (dollars per share) $ 3.24 $ 5.04    
Minimum [Member] | Stock Options [Member]        
Share-based Compensation Expense [Abstract]        
Minimum vesting period for stock option awards (in number of months) 6 months      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]        
Expected term 3 years 6 months 3 years 5 months 3 years 4 months  
Maximum [Member] | Stock Options [Member]        
Share-based Compensation Expense [Abstract]        
Maximum term of stock option awards (in number of years) 10 years      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]        
Expected term 6 years 7 months 6 years 7 months 6 years 6 months  
Executive Officer [Member] | Long-term Performance Plan [Member]        
Summary of nonvested shares [Roll Forward]        
Share-based Compensation, Executive Officer Target Allocation of Equity Under Comprehensive Award 50.00% 30.00%    
Non-Executive Officers [Member] | Long-term Performance Plan [Member]        
Summary of nonvested shares [Roll Forward]        
Share-based Compensation, Executive Officer Target Allocation of Equity Under Comprehensive Award 30.00%