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Share-Based Compensation (Equity Classified Awards Narrative) (Details)
12 Months Ended
Dec. 31, 2020
USD ($)
installment
Installment
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Feb. 14, 2018
shares
Jul. 13, 2011
shares
Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total intrinsic value of stock options exercised | $   $ 0 $ 800,000    
Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of annual installment in which stock option exercisable | Installment 3        
Period from grant date for annual installment (in years) 1 year        
Total fair value of non-option award units vested | $ $ 600,000 $ 200,000 $ 1,200,000    
SunCoke LTPEP          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock issuable (in shares) | shares       6,000,000 1,600,000
Common stock issuable pursuant to new awards (in shares) | shares       1,500,000 7,500,000
SunCoke LTPEP | Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of annual installment in which stock option exercisable | installment 3        
Period from grant date for annual installment (in years) 1 year        
Expiration period 10 years        
SunCoke LTPEP | Performance Share Units | ROIC Portion          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percent of award allocation 50.00%        
Measurement period 3 years        
SunCoke LTPEP | Performance Share Units | TSR Portion          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Measurement period 3 years        
SunCoke LTPEP | Performance Share Units | TSR Portion | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Payout percentage 75.00% 25.00% 25.00%    
Percentage adjustment of award determined by pre-tax return on capital (as a percent) 0.00%        
SunCoke LTPEP | Performance Share Units | TSR Portion | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Payout percentage 125.00% 125.00% 125.00%    
Percentage adjustment of award determined by pre-tax return on capital (as a percent) 250.00%