Share-Based Compensation - Schedule of Share-Based Compensation of PSU Activity (Details) - PSUs - Suncoke LTPEP	9 Months Ended
	Sep. 30, 2024 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
PSUs, shares (in shares) | shares	162,510
PSUs, weighted average grant date fair value per unit (in dollars per share) | $ / shares	$ 11.51
Pre-Tax Return of Capital for Coke and Coal Logistics Businesses
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of award allocation	50.00%
Measurement period	3 years
TSR
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Measurement period	3 years
TSR | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Measurement results payout percentage	80.00%
TSR | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Measurement results payout percentage	120.00%