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Leases - Narrative (Details)	Dec. 31, 2022 option
Lessee, Lease, Description [Line Items]
Number of options to renew	1
Minimum
Lessee, Lease, Description [Line Items]
Option to extend, operating lease	1 month
Maximum
Lessee, Lease, Description [Line Items]
Option to extend, operating lease	50 years

X

- Definition

Lessee, Operating Lease, Options to Renew

+ References

No definition available.

+ Details

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Namespace Prefix:	sxc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

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

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

X

- Definition

Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918673-209980

+ Details

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Balance Type:	na
Period Type:	instant

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- Details

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- Details

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