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Share-Based Compensation - Compensation Expense and Unrecognized Compensation Costs (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Board of Directors        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Compensation expense     $ 0.3 $ 0.3
Stock options        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Unrecognized Compensation Cost $ 1.3   $ 1.3  
Recognition period for unrecognized compensation cost     11 months  
Unrecognized compensation costs, estimated forfeiture rate     16.00%  
Stock options | Executive Officer        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Unrecognized compensation costs, estimated forfeiture rate     0.00%  
Stock options | Selling, General and Administrative Expenses        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Compensation expense 0.6 $ 0.4 $ 1.6 1.8
Restricted stock units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Unrecognized Compensation Cost 1.7   $ 1.7  
Recognition period for unrecognized compensation cost     1 year 2 months  
Unrecognized compensation costs, estimated forfeiture rate     18.00%  
Restricted stock units (RSUs) | Selling, General and Administrative Expenses        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Compensation expense 0.6 1.1 $ 2.1 3.2
Performance share units        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Unrecognized Compensation Cost 2.9   $ 2.9  
Recognition period for unrecognized compensation cost     2 years 2 months  
Unrecognized compensation costs, estimated forfeiture rate     0.00%  
Performance share units | Selling, General and Administrative Expenses        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Compensation expense 0.3 (0.2) $ 1.0 0.5
Equity Classified Awards | Selling, General and Administrative Expenses        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Compensation expense 1.5 1.3 4.7 5.5
Restricted Stock Units Settled in Cash        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Unrecognized Compensation Cost 0.9   $ 0.9  
Recognition period for unrecognized compensation cost     2 years 4 months  
Unrecognized compensation costs, estimated forfeiture rate     18.00%  
Restricted Stock Units Settled in Cash | Selling, General and Administrative Expenses        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Compensation expense 0.2 0.0 $ 0.3 0.0
Cash Incentive Award | Suncoke LTCIP        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Unrecognized Compensation Cost 0.6   $ 0.6  
Recognition period for unrecognized compensation cost     2 years 4 months  
Unrecognized compensation costs, estimated forfeiture rate     16.00%  
Cash Incentive Award | Selling, General and Administrative Expenses | Suncoke LTCIP        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Compensation expense 0.1 0.0 $ 0.2 0.0
Liability Classified Awards | Selling, General and Administrative Expenses | Suncoke LTCIP        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Compensation expense $ 0.3 $ 0.0 $ 0.5 $ 0.0