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Share-based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum issuable shares under Stock Incentive Plan 28,000,000    
Shares available for future grant under Stock Incentive Plan 6,000,000    
Share-based Compensation Expense [Abstract]      
Share-based Compensation Expense $ 9.2 $ 7.7 $ 5.4
Stock Options [Member]      
Share-based Compensation Expense [Abstract]      
Share-based Compensation Expense $ 2.5 $ 2.1 $ 1.0
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) 58.80% 61.50% 90.30%
Expected volatility, maximum (in hundredths) 61.60% 64.00% 91.50%
Weighted-average volatility (in hundredths) 59.50% 62.50% 90.70%
Risk-free interest rate, minimum (in hundredths) 2.30% 1.60% 1.20%
Risk-free interest rate, maximum (in hundredths) 2.60% 2.20% 1.80%
Weighted-average grant-date fair value per share of options granted $ 3.51 $ 5.33 $ 1.29
Summary of changes in shares outstanding under all long-term incentive plans [Rollforward]      
Number of options outstanding, beginning balance (in shares) 2,994,206    
Number of options granted (in shares) 842,000    
Number of options exercised (in shares) (201,700)    
Number of options canceled (in shares) (230,644)    
Number of options outstanding, ending balance (in shares) 3,403,862 2,994,206  
Number of exercisable options (in shares) 2,046,546    
Number of unvested options (in shares) 1,357,316    
Number of unvested options that are expected to vest (in shares) 1,289,450    
Weighted average exercise price per option, outstanding, beginning of period (dollars per share) $ 7.69    
Weighted average exercise price per option granted (dollars per share) 6.56    
Weighted average exercise price per option exercised (dollars per share) 3.82    
Weighted average exercise price per option canceled (dollars per share) 18.56    
Weighted average exercise price per option, outstanding, end of period (dollars per share) 6.90 $ 7.69  
Weighted average exercise price per exercisable option (dollars per share) 7.07    
Weighted average exercise price per unvested options (dollars per share) 6.66    
Weighted average exercise price per unvested options that expected to vest (dollars per share) $ 6.66    
Remaining average contractual life of options outstanding (in years) 6 years 1 month 6 days    
Remaining average contractual life of options exercisable (in years) 4 years 8 months 12 days    
Remaining average contractual life of unvested options (in years) 8 years 6 months    
Remaining average contractual life of unvested options that are expected to vest (in years) 8 years 6 months    
Aggregate intrinsic value of options outstanding, outstanding $ 0.3    
Aggregate intrinsic value of options outstanding, exercisable 0.2    
Aggregate intrinsic value of options outstanding, unvested 0.1    
Aggregate intrinsic value of options outstanding, unvested and expected to vest 0.1    
Intrinsic value of stock options exercised 0.3 $ 0.2 $ 1.4
Amount of unrecognized compensation costs $ 1.5    
Weighted average period of recognition (in years) 1 year 8 months 12 days    
Restricted Stock [Member]      
Share-based Compensation Expense [Abstract]      
Share-based Compensation Expense $ 3.1 $ 2.9 $ 1.6
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 4 months 24 days    
Summary of nonvested shares [Roll Forward]      
Nonvested, beginning of period (in shares) 518,184    
Granted (in shares) 521,100    
Vested/restrictions lapsed/earned (in shares) (513,848)    
Canceled (in shares) (18,733)    
Nonvested, end of period (in shares) 506,703 518,184  
Weighted average grant date fair value, nonvested, beginning of period (dollars per share) $ 5.38    
Weighted average grant date fair value, granted (dollars per share) 6.56 $ 9.78 $ 1.80
Weighted average grant date fair value, vested/restrictions lapsed/earned (dollars per share) 5.48    
Weighted average grant date fair value, canceled (dollars per share) 6.16    
Weighted average grant date fair value, nonvested, end of period (dollars per share) $ 6.45 $ 5.38  
Intrinsic value of shares vested/restrictions lapsed during the period $ 3.2 $ 4.1 $ 1.4
Restricted Stock Units Issued to Directors [Member]      
Share-based Compensation Expense [Abstract]      
Share-based Compensation Expense $ 1.2 1.2 1.3
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 Share Awards [Member]      
Share-based Compensation Expense [Abstract]      
Share-based Compensation Expense $ 2.0 $ 1.5 $ 1.5
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Weighted-average volatility (in hundredths) 67.30% 68.00% 60.80%
Weighted-average volatility VanEck Vectors Steel ETF (in hundredths) 52.20% 48.90%  
Weighted-average volatility S&P MidCap 400 Index (in hundredths)     27.60%
Risk-free interest rate (in hundredths) 2.20% 1.50% 1.10%
Summary of changes in shares outstanding under all long-term incentive plans [Rollforward]      
Amount of unrecognized compensation costs $ 2.6    
Weighted average period of recognition (in years) 1 year 8 months 12 days    
Summary of nonvested shares [Roll Forward]      
Nonvested, beginning of period (in shares) 718,668    
Granted (in shares) 366,500    
Vested/restrictions lapsed/earned (in shares) (277,971)    
Canceled (in shares) (192,397)    
Nonvested, end of period (in shares) 614,800 718,668  
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) 8.05 $ 10.78 $ 1.74
Weighted average grant date fair value, vested/restrictions lapsed/earned (dollars per share) 1.74    
Weighted average grant date fair value, canceled (dollars per share) 5.55    
Weighted average grant date fair value, nonvested, end of period (dollars per share) $ 9.19 $ 5.04  
Intrinsic value of shares vested/restrictions lapsed during the period $ 0.7    
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 $ 0.4 $ 0.0 $ 0.0
Summary of nonvested shares [Roll Forward]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period 3 years    
Equity-Based Long-Term Performance Plan Stock Portion Percentage Of Total Award 30.00%    
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 5 months 3 years 4 months 3 years 3 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 6 months 6 years 8 months