Share-Based Compensation - Shares Awarded (Details) - Suncoke LTPEP $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($) days $ / shares shares
Performance based options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Closing stock price threshold for performance based options (in dollars per share)	$ 9.5
Closing stock price threshold for performance based options, number of trading days | days	15
Measurement period	3 years
Performance share units | ROIC
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Closing stock price threshold for performance based options (in dollars per share)	$ 9
Closing stock price threshold for performance based options, number of trading days | days	15
Measurement period	3 years
Performance share units | Total Shareholder Return
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Measurement period	3 years
Maximum award value | $	$ 4.9
February grants | Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted | shares	95,001
Weighted-average exercise price (in dollars per share)	$ 3.80
Weighted-average fair value stock option (in dollars per share)	$ 1.71
February grants | Performance based options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted | shares	58,448
Weighted-average exercise price (in dollars per share)	$ 3.80
Weighted-average fair value stock option (in dollars per share)	$ 1.06
February grants | Performance share units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value | $	$ 1.2
February grants | Performance share units | ROIC
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted | shares	105,210
Weighted-average fair value stock option (in dollars per share)	$ 5.66
February grants | Performance share units | Total Shareholder Return
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted | shares	105,210
Weighted-average fair value stock option (in dollars per share)	$ 5.81
March grants | Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted | shares	90,925
Weighted-average exercise price (in dollars per share)	$ 6.03
Weighted-average fair value stock option (in dollars per share)	$ 2.78
March grants | Performance based options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted | shares	90,925
Weighted-average exercise price (in dollars per share)	$ 6.03
Weighted-average fair value stock option (in dollars per share)	$ 2.42
March grants | Performance share units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value | $	$ 2.0
March grants | Performance share units | ROIC
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted | shares	67,167
Weighted-average fair value stock option (in dollars per share)	$ 10.51
March grants | Performance share units | Total Shareholder Return
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted | shares	201,500
Weighted-average fair value stock option (in dollars per share)	$ 6.35