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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% |  |  |  |

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