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Postretirement Benefit Plans - Weighted-Average Assumptions Used To Determine Benefit Obligations (Detail)	Dec. 31, 2020	Dec. 31, 2019
United States [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Discount rate	2.60%	3.30%
United Kingdom [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Discount rate	1.40%	2.10%

X

- Definition

Pension plans postretirement and other employee benefits.

+ References

No definition available.

+ Details

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Namespace Prefix:	scl_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(1)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

+ Details

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X

- Details

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Namespace Prefix:
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X

- Details

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Namespace Prefix:
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