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v3.20.4

Debt and Financing Obligations (Financing Obligation) (Details) - Integral Equipment and Mobile Equipment - Domestic Coke and Coal Logistics | 12 Months Ended
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Dec. 31, 2020
Sale Leaseback Transaction [Line Items] |
Initial lease period | 48 months
Buyout option period | 36 months

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- Definition Sale Leaseback Transaction, Lease Term + References No definition available. + Details
Name: | sxc_SaleLeasebackTransactionLeaseTerm
Namespace Prefix: | sxc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Sale Leaseback Transaction, Lease Term Before Early Buyout Option + References No definition available. + Details
Name: | sxc_SaleLeasebackTransactionLeaseTermBeforeEarlyBuyoutOption
Namespace Prefix: | sxc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- 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_SaleLeasebackTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SaleLeasebackTransactionDescriptionAxis=sxc_IntegralEquipmentandMobileEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=sxc_DomesticCokeandCoalLogisticsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |