XML 150 R102.htm IDEA: XBRL DOCUMENT v3.20.4

Share-Based Compensation (Liability Classified Awards Narrative) (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) Installment $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares
Restricted Stock Units Settled in Cash
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (shares) | shares	263,998	147,851	98,364
Number of annual installment in which stock option exercisable | Installment	3
Period from grant date for annual installment (in years)	1 year
Granted (in USD per share) | $ / shares	$ 6.04	$ 9.66	$ 10.71
Closing price (USD per share) | $ / shares	$ 4.35
Cash Incentive Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of annual installment in which stock option exercisable | Installment	3
Cash Incentive Award | Suncoke LTCIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value award | $	$ 2.0	$ 0.6	$ 1.0
Percent of award allocation	50.00%
Measurement period	3 years

X

- Definition

Number of annual Installment in which stock option exercisable.

+ References

No definition available.

+ Details

Name:	sxc_NumberOfAnnualInstallmentInWhichStockOptionExercisable
Namespace Prefix:	sxc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Period from grant date for annual installment.

+ References

No definition available.

+ Details

Name:	sxc_PeriodFromGrantDateForAnnualInstallment
Namespace Prefix:	sxc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Measurement Period

+ References

No definition available.

+ Details

Name:	sxc_SharebasedCompensationArrangementbySharebasedPaymentAwardAwardVestingRightsMeasurementPeriod
Namespace Prefix:	sxc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Fair Value

+ References

No definition available.

+ Details

Name:	sxc_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsGrantsinPeriodFairValue
Namespace Prefix:	sxc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Percent of Award Allocation

+ References

No definition available.

+ Details

Name:	sxc_SharebasedCompensationArrangementbySharebasedPaymentAwardPercentofAwardAllocation
Namespace Prefix:	sxc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Share-based Compensation by Share-based Payment Award, Price Per Share

+ References

No definition available.

+ Details

Name:	sxc_SharebasedCompensationbySharebasedPaymentAwardPricePerShare
Namespace Prefix:	sxc_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_AwardTypeAxis=sxc_RestrictedStockUnitsSettledinCashMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_AwardTypeAxis=sxc_CashIncentiveAwardMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PlanNameAxis=sxc_SuncokeLTCIPMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: